LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 54

Search options

  1. Article: Hyperspectral imaging as a means to assess quality issues of cut flowers

    Stead, A. D / Gay, A / Taylor, J / Ougham, H / Wagstaff, C / Rogers, H. J

    Acta horticulturae. 2019, , no. 1263

    2019  

    Abstract: Accurately predicting vase-life would ensure that retailers can provide assurances as to the quality of cut flowers with respect to a guaranteed vase-life. However, at the present time any vase-life testing is performed concurrent with the consumers' use ...

    Abstract Accurately predicting vase-life would ensure that retailers can provide assurances as to the quality of cut flowers with respect to a guaranteed vase-life. However, at the present time any vase-life testing is performed concurrent with the consumers' use of the flowers. Several options have previously been proposed for cut flower testing based upon developmental morphology, biochemistry or gene expression, but such methods maybe inaccurate, expensive and are not instant. Therefore, there may be a delay in being able to sell such flowers until the test results are analysed, which is impractical. Hyperspectral imaging (HSI) is routinely used for quality control of many foodstuffs and can be performed at video rates, and could thus provide fast and accurate data on aspects of flower quality. Here we report the use of HSI to distinguish the different developmental stages of two different cultivars of cut Alstroemeria flowers, and to detect flowers that have been stored for several days from those freshly harvested. It was also possible to distinguish stored flowers that had been refreshed in water from freshly harvested flowers, even though they were indistinguishable by eye, moreover such stored and refreshed flowers are known to have a reduced vase life.
    Keywords Alstroemeria ; biochemistry ; cultivars ; cut flowers ; developmental stages ; flowers ; foods ; gene expression ; hyperspectral imagery ; prediction ; quality control ; vase life
    Language English
    Size p. 359-366.
    Publishing place International Society for Horticultural Science.
    Document type Article
    Note Paper presented at the XXX International Horticultural Congress IHC2018: International Symposium on Ornamental Horticulture and XI International Symposium on Postharvest Quality of Ornamental Plants held August 12, 2018, Istanbul, Turkey
    ISSN 0567-7572
    DOI 10.17660/ActaHortic.2019.1263.47
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    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.

  2. Article: Studies on flower longevity in Digitalis : Pollination induced corolla abscission in Digitalis flowers.

    Stead, A D / Moore, K G

    Planta

    2013  Volume 146, Issue 4, Page(s) 409–414

    Abstract: Flower lifespan was terminated by corolla abscission 5-6 days after stigma opening in the unpollinated flower. Increased pollen loads produced increased seed set and reduced flower longevity progressively to a minimum of one day after pollination with ... ...

    Abstract Flower lifespan was terminated by corolla abscission 5-6 days after stigma opening in the unpollinated flower. Increased pollen loads produced increased seed set and reduced flower longevity progressively to a minimum of one day after pollination with pure pollen. Weakening of the abscission zone was detectable 8 h after pollination, whilst the pollen tubes were still within the stigmatic zone, suggesting that a stimulus, moving at 4 mm h(-1) minimum, was transmitted through the style and ovary. Soon after pollination removal of the stigma prevented the pollination-induced corolla abscission. Later it was necessary to remove the stigma and upper style, and later still the whole style to delay abscission. The progressive induction of the stigma and style took place at a rate of 1.5 mm h(-1), in advance of the pollen tubes which grew at 0.75 mm h(-1). It was not possible to reproduce the pollination effects by application of indoleacetic acid (IAA) to the stigma or the style.
    Language English
    Publishing date 2013-12-07
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/BF00380853
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 46/303: 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.

  3. Article: Studies on flower longevity in Digitalis : The role of ethylene in corolla abscission.

    Stead, A D / Moore, K G

    Planta

    2013  Volume 157, Issue 1, Page(s) 15–21

    Abstract: The flowers of Digitalis purpurea respond to pollination by rapid corolla abscission without any loss of corolla turgor, nor any significant loss of corolla constituents, relative to the corollas of unpollinated flowers of a similar age. The corollas of ... ...

    Abstract The flowers of Digitalis purpurea respond to pollination by rapid corolla abscission without any loss of corolla turgor, nor any significant loss of corolla constituents, relative to the corollas of unpollinated flowers of a similar age. The corollas of unpollinated flowers too eventually abscise, 6 d after the stigma opens, however, they do so with only a minimal loss of fresh weight or corolla constituents. Pollination causes an increase in ethylene production detectable within 1 h. Increased ethylene production occurs initially only from the upper portion of the style, later from the lower portion, and lastly, between 23 and 48 h after pollination, from the ovary plus calyx. The pollination response can be induced by exogenous ethylene, the degree of weakening of the corolla abscission zone being dependent upon the concentration and duration of the exposure period and on the stage of flower development. The regulation of ethylene biosynthesis and its involvement in the control of pollination-induced corolla abscission are discussed.
    Language English
    Publishing date 2013-11-22
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/BF00394535
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 46/303: 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.

  4. Article: Flower senescence in composite flowers, can understanding how dahlia florets senesce help to increase dahlia vase life?

    Casey, M / Tansey, K. E / Andrews, R / Marchbank, A / Rogers, H. J / Stead, A. D

    Acta horticulturae. 2019, , no. 1263

    2019  

    Abstract: The dahlia is popular as an ornamental garden plant in the UK, however, its value as a cut flower has been undermined by its short vase life. The vase life of dahlias is often no more than 5 days, whereas 10-14 days are required by the cut flower ... ...

    Abstract The dahlia is popular as an ornamental garden plant in the UK, however, its value as a cut flower has been undermined by its short vase life. The vase life of dahlias is often no more than 5 days, whereas 10-14 days are required by the cut flower industry due to the supply chain involved in transporting cut flowers from growers to retailers, sufficient time in store, and still guaranteeing 5 days vase life to a consumer. The current study has considered ethylene sensitivity and how phytohormones interact with one another during the senescence process. In conjunction with these traditional methods, RNA sequencing and de novo assembly of the dahlia transcriptome in the cultivar 'Sylvia' has been carried out, resulting in an assembly of over 20,000 genes, many of which change in expression during floret senescence.
    Keywords cultivars ; cut flowers ; ethylene ; florets ; genes ; growers ; industry ; ornamental plants ; sequence analysis ; supply chain ; transcriptome ; vase life
    Language English
    Size p. 383-390.
    Publishing place International Society for Horticultural Science.
    Document type Article
    Note Paper presented at the XXX International Horticultural Congress IHC2018: International Symposium on Ornamental Horticulture and XI International Symposium on Postharvest Quality of Ornamental Plants held August 12, 2018, Istanbul, Turkey
    ISSN 0567-7572
    DOI 10.17660/ActaHortic.2019.1263.50
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    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.

  5. Article: Pollen-pistil interaction in Brassica oleracea : Events prior to pollen germination.

    Stead, A D / Roberts, I N / Dickinson, H G

    Planta

    2014  Volume 146, Issue 2, Page(s) 211–216

    Abstract: Quantitative studies of the adhesion of pollen grains to the stigma in Brassica oleracea revealed that self-pollen is initially less firmly bound than cross-pollen. The pollen grain tryphine, believed to be important in the adhesion process, has been ... ...

    Abstract Quantitative studies of the adhesion of pollen grains to the stigma in Brassica oleracea revealed that self-pollen is initially less firmly bound than cross-pollen. The pollen grain tryphine, believed to be important in the adhesion process, has been shown to differ in mobility following self- and cross-pollination when observed using fluorescent probes. The hydration of the pollen grains has been investigated in vitro by measuring the changes in shape, volume and fresh weight of the imbibing grains. Whilst little change in volume could be detected there was a considerable increase in fresh weight together with a change of shape. The significance of these events, which occur prior to pollen germination, is discussed in relation to their effect upon subsequent germination and expression of self-incompatibility.
    Language English
    Publishing date 2014-01-28
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/BF00388234
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 46/303: 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.

  6. Article: De novo transcriptome analysis of peduncle necking in cut Rosa hybrida cultivar 'H30'

    Lear, B. G. A / Marchbank, A / Kent, N. A / Tansey, K. E / Andrews, R / Devlin, P. F / Rogers, H. J / Stead, A. D

    Acta horticulturae. 2019, , no. 1263

    2019  

    Abstract: Bent-neck or ‘necking’ is a phenomenon often seen in cut roses, whereby the flower head droops due to a bending of the peduncle. Necking is thought to be caused by a blockage of the xylem, either due to an air embolism or an accumulation of microbes, ... ...

    Abstract Bent-neck or ‘necking’ is a phenomenon often seen in cut roses, whereby the flower head droops due to a bending of the peduncle. Necking is thought to be caused by a blockage of the xylem, either due to an air embolism or an accumulation of microbes, limiting water uptake to the flower head and causing the stem to bend. Despite the use of biocides to reduce microbial growth, necking remains an issue for the cut flower sector and roses continue to die prematurely. As the occurrence of necking varies widely within and between cultivars, a transcriptome analysis of cut Rosa hybrida cultivar ‘H30’ has been carried out to investigate the potential molecular mechanisms involved. Peduncle samples of three stages of necking (straight, <90° and ≥90°) were sequenced using next generation sequencing to produce over 100 million reads per stage and 203,565 contigs following Trinity de novo assembly. Differential expression analysis revealed nearly 2,000 significant transcripts (p adjust <0.05); providing a new resource for further analysis into the process of necking.
    Keywords Rosa hybr. ; air ; biocides ; cultivars ; cut flowers ; embolism ; flowers ; gene expression regulation ; high-throughput nucleotide sequencing ; hybrids ; microbial growth ; microorganisms ; peduncle ; transcriptomics ; water uptake ; xylem
    Language English
    Size p. 351-358.
    Publishing place International Society for Horticultural Science.
    Document type Article
    Note Paper presented at the XXX International Horticultural Congress IHC2018: International Symposium on Ornamental Horticulture and XI International Symposium on Postharvest Quality of Ornamental Plants held August 12, 2018, Istanbul, Turkey
    ISSN 0567-7572
    DOI 10.17660/ActaHortic.2019.1263.46
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    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.

  7. Article: A glycoprotein associated with the acquisition of the self-incompatibility system by maturing stigmas of Brassica oleracea.

    Roberts, I N / Stead, A D / Ockendon, D J / Dickinson, H G

    Planta

    2014  Volume 146, Issue 2, Page(s) 179–183

    Abstract: Iso-electric focusing of extracts derived from stigmatic homogenates of Brassica oleracea reveals that the mature stigma possesses large quantities of a glycoprotein not present in earlier stages of development in the bud. Pollen germination experiments ... ...

    Abstract Iso-electric focusing of extracts derived from stigmatic homogenates of Brassica oleracea reveals that the mature stigma possesses large quantities of a glycoprotein not present in earlier stages of development in the bud. Pollen germination experiments carried out in parallel with the biochemical tests suggest that the appearance of this glycoprotein, which has an isoelectric point of pH 5.8, is coincident with the development of the self-incompatibility response. The site of this protein, and the role it may play in pollen-stigma interactions are discussed in terms of current models of the self-incompatibility system in Brassica.
    Language English
    Publishing date 2014-01-28
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/BF00388229
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 46/303: 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.

  8. Article: Pollen stigma interactions in Brassica oleracea.

    Roberts, I N / Stead, A D / Ockendon, D J / Dickinson, H G

    TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik

    2013  Volume 58, Issue 6, Page(s) 241–246

    Abstract: Recent studies on the mechanism of self-incompatibility in Brassica indicate the location, nature and mode of action of the molecules involved. Characteristics of the pollen surface and the stigma surface are described in detail, together with new ... ...

    Abstract Recent studies on the mechanism of self-incompatibility in Brassica indicate the location, nature and mode of action of the molecules involved. Characteristics of the pollen surface and the stigma surface are described in detail, together with new information pertaining to the recognition molecules located therein. A sequence of events is outlined leading from pollination, through adhesion, hydration, germination, and tube growth to acceptance and ultimate compatibility. The characteristics of rejection of incompatible grains are described for each stage of the pollen-stigma interaction. It is proposed that recognition of proteins from the coating of self-pollen by the molecules in the pellicle results in the formation of a biologically-active complex which inhibits water supply to the incompatible grain, and that all other manifestations of incompatibility are a consequence of this initial response.
    Language English
    Publishing date 2013-12-04
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2170-2
    ISSN 1432-2242 ; 0040-5752
    ISSN (online) 1432-2242
    ISSN 0040-5752
    DOI 10.1007/BF00265173
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Zs.A 1692: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

    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.

  9. Article: Pollination-induced flower senescence: a review

    Stead, A.D

    Plant growth regulation. Jan 1992. v. 11 (1)

    1992  

    Abstract: Ethylene has long been implicated in the control of the senescence of many cut flower species, but the control of senescence in relation to wild species has received much less attention. The longevity of individual flowers varies greatly from species to ... ...

    Abstract Ethylene has long been implicated in the control of the senescence of many cut flower species, but the control of senescence in relation to wild species has received much less attention. The longevity of individual flowers varies greatly from species to species; in some each flower is open for just a few hours, whilst in others the flower may persist for several weeks, or even months. The functional life of the flower may be terminated by petal wilting, abscission or a colour change of all, or part, of the perianth. In some species pollination appears to reduce floral longevity whilst in others, particularly those species having short-lived flowers, the pattern of flower development and senescence appears unaffected by pollination. Examples of the various pollination-induced strategies shown by plants are presented and the role of ethylene and other potential mediators of senescence in these processes discussed.
    Keywords plant physiology ; pollination ; flowers ; longevity ; senescence ; ethylene
    Language English
    Dates of publication 1992-01
    Size p. 13-20.
    Document type Article
    Note Literature review.
    ZDB-ID 843025-1
    ISSN 1573-5087 ; 0167-6903
    ISSN (online) 1573-5087
    ISSN 0167-6903
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 3711: 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.

  10. Book: Molecular and cellular aspects of plant reproduction

    Scott, R. J / Stead, A. D

    (Seminar series / Society for Experimental Biology ; 55)

    1994  

    Author's details edited by R.J. Scott, A.D. Stead
    Series title Seminar series / Society for Experimental Biology ; 55
    Keywords Flowers/Morphogenesis/Molecular aspects/Congresses. ; Plants/Reproduction/Molecular aspects/Congresses. ; Plant cellular control mechanisms/Congresses.
    Language English
    Size xii, 315 p. :, ill. ;, 24 cm.
    Publisher Cambridge University Press
    Publishing place Cambridge ; New York
    Document type Book
    Note Conference proceedings.
    ISBN 0521455251 ; 9780521455251
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    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.

To top