LIVIVO - Search results -

Search results

Result 1 - 10 of total 16

Search options

Thesis ; Online: Lighting the way for increased vitamin C in tomatoes

Ntagkas, Nikolaos

2020

Abstract: L-ascorbate is a phytochemical essential for human health. Light regulates L-ascorbate (vitamin C; ASC) levels in plants with the vast majority of the evidence referring to leaves. In the present study the focus was on the effects of light on ASC levels ... ...

Abstract	L-ascorbate is a phytochemical essential for human health. Light regulates L-ascorbate (vitamin C; ASC) levels in plants with the vast majority of the evidence referring to leaves. In the present study the focus was on the effects of light on ASC levels in tomato fruits. The aim of this work as explained in Chapter 1, was to investigate which physiological processes and how do they mediate the effects of light on ASC levels in tomato fruits. Furthermore, the effects of light over the broader metabolome of the tomato fruit are investigated.In Chapter 2, a literature review is presented with the aim to highlight the physiological and biochemical network mediating the regulation of ASC by light. Respiration, photosynthesis and soluble carbohydrates are proposed to control ASC levels in plants. Possible interactions between these physiological components and their importance in light regulation of ASC in both leaves and fruits were discussed. Furthermore, a broad biochemical map for ASC biosynthesis, recycling and turnover was presented and the contribution of specific pathways to the ASC pool is discussed. It is concluded that the main biosynthetic pathway (D-man/L-gal) for ASC accounts for the vast majority of the ASC pool in leaves as well as in fruits.In Chapter 3, the effects of light intensity and spectrum on ASC levels in detached tomato fruits were investigated. ASC levels of fruits increased under light compared to darkness, as long as the fruits were green. Red fruits did not respond to the light treatments. Accumulation of ACS under light was not much affected by the light spectrum. The effect of light on ASC is proposed to be universal for tomato as several tested genotypes were found to be similarly responsive to the same light treatments. As only mature green fruits respond to the light treatments and the rate of photosynthesis correlated with ASC levels, it is put forward that the regulatory effect of light on ASC in tomato fruits is mediated through photosynthesis. No correlation between ASC levels ...
Keywords	Life Science
Subject code	333
Language	English
Publisher	Wageningen University
Publishing country	nl
Document type	Thesis ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾

Article: The role of light intensity in mediating ascorbic acid content during postharvest tomato ripening: A transcriptomic analysis

Zhang, Yating / Ntagkas, Nikolaos / Fanourakis, Dimitrios / Tsaniklidis, Georgios / Zhao, Jiantao / Cheng, Ruifeng / Yang, Qichang / Li, Tao

Postharvest biology and technology. 2021 Oct., v. 180

2021

Abstract: Ascorbic acid (ASA) is an essential antioxidant, participating in diverse processes. In this study, tomato fruit at two maturity stages (mature-green, breaker) were first exposed to light at four photosynthetic photon flux density (PPFD) levels [0 ( ... ...

Abstract	Ascorbic acid (ASA) is an essential antioxidant, participating in diverse processes. In this study, tomato fruit at two maturity stages (mature-green, breaker) were first exposed to light at four photosynthetic photon flux density (PPFD) levels [0 (darkness), 50, 300, 600 μmol m-² s⁻¹], and then to darkness. As PPFD increased, ASA content was enhanced. The light-induced ASA content increase was dependent on the maturity stage, and persisted following darkening. High PPFD up-regulated the expression of key genes of the D-mannose/L-galactose pathway, showing the biosynthesis contributed, while the ASA recycling had a limited contribution. Weighted correlation network analysis showed that high PPFD potentially enhances the photosynthetic photon transduction, especially cyclic electron flow to excess photons. High PPFD up-regulated the expression of genes encoding non-enzymatic antioxidant biosynthesis. We show that photosynthetic photon transduction mediates fruit adaptation to light intensity, and provides new insights into the interactive regulation of fruit ASA accumulation.
Keywords	antioxidants ; ascorbic acid ; biosynthesis ; fruits ; light intensity ; maturity stage ; photons ; photosynthesis ; tomatoes ; transcriptomics
Language	English
Dates of publication	2021-10
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1082798-5
ISSN	1873-2356 ; 0925-5214
ISSN (online)	1873-2356
ISSN	0925-5214
DOI	10.1016/j.postharvbio.2021.111622
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 5311: Show issues

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Impact of light on leaf initiation: a matter of photosynthate availability in the apical bud?

Savvides, Andreas / Ntagkas, Nikolaos / van Ieperen, Wim / Dieleman, Janneke A / Marcelis, Leo F M

Functional plant biology : FPB

2020 Volume 41, Issue 5, Page(s) 547–556

Abstract: Radiation substantially affects leaf initiation rate (LIR), a key variable for plant growth, by influencing the heat budget and therefore the temperature of the shoot apical meristem. The photosynthetically active component of solar radiation ( ... ...

Abstract	Radiation substantially affects leaf initiation rate (LIR), a key variable for plant growth, by influencing the heat budget and therefore the temperature of the shoot apical meristem. The photosynthetically active component of solar radiation (photosynthetic photon flux density; PPFD) is critical for plant growth and when at shade to moderate levels may also influence LIR via limited photosynthate availability. Cucumber and tomato plants were subjected to different PPFDs (2.5-13.2molm-2 day-1) and then LIR, carbohydrate content and diel net CO2 uptake of the apical bud were quantified. LIR showed saturating response to increasing PPFD in both species. In this PPFD range, LIR was reduced by 20% in cucumber and by 40% in tomato plants. Carbohydrate content and dark respiration were substantially reduced at low PPFD. LIR may be considered as an adaptive trait of plants to low light levels, which is likely to be determined by the local photosynthate availability. In tomato and cucumber plants, LIR can be markedly reduced at low PPFD in plant production systems at high latitudes, suggesting that models solely based on thermal time may not precisely predict LIR at low PPFD.
Language	English
Publishing date	2020-06-02
Publishing country	Australia
Document type	Journal Article
ZDB-ID	2071582-1
ISSN	1445-4416 ; 1445-4408
ISSN (online)	1445-4416
ISSN	1445-4408
DOI	10.1071/FP13217
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 4753: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: Light regulation of vitamin C in tomato fruit is mediated through photosynthesis

Ntagkas, Nikolaos / Caroline Labrie / Celine Nicole / Ernst Woltering / Leo F.M. Marcelis

Environmental and experimental botany. 2019 Feb., v. 158

2019

Abstract: Higher levels of irradiance result in higher accumulation of ascorbate in leaves and fruits. Photosynthesis and respiration are an integral part of the physiological mechanism of light regulation of ascorbate in leaves, but little is known about the ... ...

Abstract	Higher levels of irradiance result in higher accumulation of ascorbate in leaves and fruits. Photosynthesis and respiration are an integral part of the physiological mechanism of light regulation of ascorbate in leaves, but little is known about the light regulation of ascorbate in fruit. The aim of this study was to investigate whether fruit illumination alone is sufficient for ascorbate increase in tomato fruit and whether this light signal is mediated by respiration and photosynthesis. First the changes of ascorbate with the progress of fruit development were investigated and subsequently detached fruit of different tomato genotypes were exposed to different irradiances and spectra. Measurements were performed on ascorbate, respiration, photosynthesis and chlorophyll content of the fruit. When attached to the plant, there was no effect of development on ascorbate from the mature green to the red stage. Detached fruit stored in darkness did not accumulate ascorbate. However, when exposed to 300–600 μmol m−2 s-1 light detached mature green fruit (photosynthetically active) substantially accumulated ascorbate, while mature red fruit (non-photosynthetically active) did not respond to light. Photosynthesis correlated with this increase of ascorbate while no correlation between respiration and ascorbate was found. Spectral effects on ascorbate in detached tomato fruit were limited. These results indicate that the signal for light regulation of ascorbate is perceived locally in the fruit and that fruit illumination alone is sufficient for a considerable increase in ascorbate levels for as long as the fruit contains chlorophyll. It is shown that photosynthetic activity of the fruit is an integral part of the response of ascorbate to light in tomato fruit. The light induced increase in ascorbate levels occurred in a range of genotypes, indicating a universal effect of light to ascorbate in tomato fruit.
Keywords	ascorbic acid ; chlorophyll ; fruiting ; genotype ; leaves ; light intensity ; lighting ; photosynthesis ; tomatoes
Language	English
Dates of publication	2019-02
Size	p. 180-188.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	195968-2
ISSN	0098-8472
ISSN	0098-8472
DOI	10.1016/j.envexpbot.2018.12.002
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 1950: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Light regulates ascorbate in plants

Ntagkas, Nikolaos / Woltering, Ernst J. / Marcelis, Leo F.M.

Environmental and Experimental Botany

An integrated view on physiology and biochemistry

2018 Volume 147

Abstract: l-ascorbate (vitamin. C, ASC) is an antioxidant that is essential for the proper function not only of plants but also animals. Light is a major regulatory factor for ASC levels in plants. In this paper, we review the regulation of ASC by light and the ... ...

Abstract	l-ascorbate (vitamin. C, ASC) is an antioxidant that is essential for the proper function not only of plants but also animals. Light is a major regulatory factor for ASC levels in plants. In this paper, we review the regulation of ASC by light and the involved biochemical and physiological processes. Several biochemical pathways for ASC biosynthesis have been proposed to exist in plants. We aim to determine the contribution of these biochemical pathways on ASC levels and, locate the steps of them that are affected by light. From biochemical and genetic studies only evidence for ASC biosynthesis occurring via the d-mannose/L-galactose biosynthetic pathway was found. Alternative pathways might account for ASC biosynthesis only in transgenic plants. Apart from biosynthesis, recycling and turnover of ASC might affect the size of the ASC pool. Light regulation of ASC levels in plants occurs primarily via effects on biosynthesis. In addition, light affects ASC homeostasis and translocation within the plant. Light regulation of ASC has been studied for individual physiological processes without taking into account possible interactions. By establishing the physiological network behind light regulation of ASC for both leaves and fruit, we developed a novel hypothesis on interactions between the physiological processes that regulate ASC. We conclude that respiration and photosynthesis interact in light regulation of ASC biosynthesis via carbohydrate availability.
Keywords	Ascorbate ; Light regulation ; Vitamin C ; Vitamin C biochemistry ; Vitamin C physiology
Subject code	580
Language	English
Publishing country	nl
Document type	Article ; Online
ZDB-ID	195968-2
ISSN	0098-8472
ISSN	0098-8472
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

In stock of ZB MED Bonn / Germany

Z 1950: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾

Article: Light regulates ascorbate in plants: An integrated view on physiology and biochemistry

Ntagkas, Nikolaos / Ernst J. Woltering / Leo F.M. Marcelis

Environmental and experimental botany. 2018 Mar., v. 147

2018

Abstract: l-ascorbate (vitaminC, ASC) is an antioxidant that is essential for the proper function not only of plants but also animals. Light is a major regulatory factor for ASC levels in plants. In this paper, we review the regulation of ASC by light and the ... ...

Abstract	l-ascorbate (vitaminC, ASC) is an antioxidant that is essential for the proper function not only of plants but also animals. Light is a major regulatory factor for ASC levels in plants. In this paper, we review the regulation of ASC by light and the involved biochemical and physiological processes. Several biochemical pathways for ASC biosynthesis have been proposed to exist in plants. We aim to determine the contribution of these biochemical pathways on ASC levels and, locate the steps of them that are affected by light. From biochemical and genetic studies only evidence for ASC biosynthesis occurring via the d-mannose/L-galactose biosynthetic pathway was found. Alternative pathways might account for ASC biosynthesis only in transgenic plants. Apart from biosynthesis, recycling and turnover of ASC might affect the size of the ASC pool. Light regulation of ASC levels in plants occurs primarily via effects on biosynthesis. In addition, light affects ASC homeostasis and translocation within the plant. Light regulation of ASC has been studied for individual physiological processes without taking into account possible interactions. By establishing the physiological network behind light regulation of ASC for both leaves and fruit, we developed a novel hypothesis on interactions between the physiological processes that regulate ASC. We conclude that respiration and photosynthesis interact in light regulation of ASC biosynthesis via carbohydrate availability.
Keywords	animals ; antioxidants ; biochemical pathways ; biosynthesis ; carbohydrates ; homeostasis ; leaves ; photosynthesis ; recycling ; transgenic plants
Language	English
Dates of publication	2018-03
Size	p. 271-280.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	195968-2
ISSN	0098-8472
ISSN	0098-8472
DOI	10.1016/j.envexpbot.2017.10.009
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 1950: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: Modulation of the Tomato Fruit Metabolome by LED Light.

Ntagkas, Nikolaos / de Vos, Ric C H / Woltering, Ernst J / Nicole, Celine C S / Labrie, Caroline / Marcelis, Leo F M

Metabolites

2020 Volume 10, Issue 6

Abstract: Metabolic profiles of tomatoes change during ripening and light can modulate the activity of relevant biochemical pathways. We investigated the effects of light directly supplied to the fruits on the metabolome of the fruit pericarp during ripening. ... ...

Abstract	Metabolic profiles of tomatoes change during ripening and light can modulate the activity of relevant biochemical pathways. We investigated the effects of light directly supplied to the fruits on the metabolome of the fruit pericarp during ripening. Mature green tomatoes were exposed to well-controlled conditions with light as the only varying factor; control fruits were kept in darkness. In experiment 1 the fruits were exposed to either white light or darkness for 15 days. In experiment 2, fruits were exposed to different light spectra (blue, green, red, far-red, white) added to white background light for seven days. Changes in the global metabolome of the fruit pericarp were monitored using LCMS and GCMS (554 compounds in total). Health-beneficial compounds (carotenoids, flavonoids, tocopherols and phenolic acids) accumulated faster under white light compared to darkness, while alkaloids and chlorophylls decreased faster. Light also changed the levels of taste-related metabolites including glutamate and malate. The light spectrum treatments indicated that the addition of blue light was the most effective treatment in altering the fruit metabolome. We conclude that light during ripening of tomatoes can have various effects on the metabolome and may help with shaping the levels of key compounds involved in various fruit quality characteristics.
Language	English
Publishing date	2020-06-26
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662251-8
ISSN	2218-1989
ISSN	2218-1989
DOI	10.3390/metabo10060266
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: A meta‐analysis of plant responses to light intensity for 70 traits ranging from molecules to whole plant performance

Poorter, Hendrik / Niinemets, Ülo / Ntagkas, Nikolaos / Siebenkäs, Alrun / Mäenpää, Maarit / Matsubara, Shizue / Pons, ThijsL

new phytologist. 2019 Aug., v. 223, no. 3

2019

Abstract: By means of meta‐analyses we determined how 70 traits related to plant anatomy, morphology, chemistry, physiology, growth and reproduction are affected by daily light integral (DLI; mol photons m−2 d−1). A large database including 500 experiments with ... ...

Abstract	By means of meta‐analyses we determined how 70 traits related to plant anatomy, morphology, chemistry, physiology, growth and reproduction are affected by daily light integral (DLI; mol photons m−2 d−1). A large database including 500 experiments with 760 plant species enabled us to determine generalized dose–response curves. Many traits increase with DLI in a saturating fashion. Some showed a more than 10‐fold increase over the DLI range of 1–50 mol m−2 d−1, such as the number of seeds produced per plant and the actual rate of photosynthesis. Strong decreases with DLI (up to three‐fold) were observed for leaf area ratio and leaf payback time. Plasticity differences among species groups were generally small compared with the overall responses to DLI. However, for a number of traits, including photosynthetic capacity and realized growth, we found woody and shade‐tolerant species to have lower plasticity. We further conclude that the direction and degree of trait changes adheres with responses to plant density and to vertical light gradients within plant canopies. This synthesis provides a strong quantitative basis for understanding plant acclimation to light, from molecular to whole plant responses, but also identifies the variables that currently form weak spots in our knowledge, such as respiration and reproductive characteristics.
Keywords	acclimation ; canopy ; chemistry ; databases ; dose response ; leaf area ; leaves ; light intensity ; meta-analysis ; photons ; photosynthesis ; plant density ; plant response ; reproduction ; seeds ; shade tolerance
Language	English
Dates of publication	2019-08
Size	p. 1073-1105.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	REVIEW
ZDB-ID	208885-x
ISSN	1469-8137 ; 0028-646X
ISSN (online)	1469-8137
ISSN	0028-646X
DOI	10.1111/nph.15754
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 868: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: Light-Induced Vitamin C Accumulation in Tomato Fruits is Independent of Carbohydrate Availability.

Ntagkas, Nikolaos / Woltering, Ernst / Bouras, Sofoklis / de Vos, Ric Ch / Dieleman, J Anja / Nicole, Celine Cs / Labrie, Caroline / Marcelis, Leo Fm

Plants (Basel, Switzerland)

2019 Volume 8, Issue 4

Abstract: L-ascorbate (ASC) is essential for human health. Therefore, there is interest in increasing the ASC content of crops like tomato. High irradiance induces accumulation of ASC in green tomato fruits. The D-mannose/L-galactose biosynthetic pathway accounts ... ...

Abstract	L-ascorbate (ASC) is essential for human health. Therefore, there is interest in increasing the ASC content of crops like tomato. High irradiance induces accumulation of ASC in green tomato fruits. The D-mannose/L-galactose biosynthetic pathway accounts for the most ASC in plants. The myo-inositol and galacturonate pathways have been proposed to exist but never identified in plants. The D-mannose/L-galactose starts from D-glucose. In a series of experiments, we tested the hypothesis that ASC levels depend on soluble carbohydrate content when tomato fruits ripen under irradiances that stimulate ASC biosynthesis. We show that ASC levels considerably increased when fruits ripened under light, but carbohydrate levels did not show a parallel increase. When carbohydrate levels in fruits were altered by flower pruning, no effects on ASC levels were observed at harvest or after ripening under irradiances that induce ASC accumulation. Artificial feeding of trusses with sucrose increased carbohydrate levels, but did not affect the light-induced ASC levels. We conclude that light-induced accumulation of ASC is independent of the carbohydrate content in tomato fruits. In tomato fruit treated with light, the increase in ASC was preceded by a concomitant increase in myo-inositol.
Language	English
Publishing date	2019-04-03
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2704341-1
ISSN	2223-7747
ISSN	2223-7747
DOI	10.3390/plants8040086
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: A meta-analysis of plant responses to light intensity for 70 traits ranging from molecules to whole plant performance.

Poorter, Hendrik / Niinemets, Ülo / Ntagkas, Nikolaos / Siebenkäs, Alrun / Mäenpää, Maarit / Matsubara, Shizue / Pons, ThijsL

The New phytologist

2019 Volume 223, Issue 3, Page(s) 1073–1105

Abstract: By means of meta-analyses we determined how 70 traits related to plant anatomy, morphology, chemistry, physiology, growth and reproduction are affected by daily light integral (DLI; mol photons ... ...

Abstract	By means of meta-analyses we determined how 70 traits related to plant anatomy, morphology, chemistry, physiology, growth and reproduction are affected by daily light integral (DLI; mol photons m
MeSH term(s)	Adaptation, Physiological ; Dose-Response Relationship, Radiation ; Light ; Plant Development/radiation effects ; Plants/genetics ; Plants/radiation effects ; Quantitative Trait, Heritable
Language	English
Publishing date	2019-04-08
Publishing country	England
Document type	Journal Article ; Meta-Analysis ; Review
ZDB-ID	208885-x
ISSN	1469-8137 ; 0028-646X
ISSN (online)	1469-8137
ISSN	0028-646X
DOI	10.1111/nph.15754
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 868: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

To top

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED