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  1. Article: CRISPR/Cas9-Mediated Editing of

    Lin, Yiyun / Jones, Michelle L

    Frontiers in plant science

    2022  Volume 13, Page(s) 840218

    Abstract: Developmental petal senescence is a type of programmed cell death (PCD), during which the production of ethylene is induced, the expression of PCD-related genes is upregulated, and nutrients are recycled. Autophagy is an intracellular mechanism involved ... ...

    Abstract Developmental petal senescence is a type of programmed cell death (PCD), during which the production of ethylene is induced, the expression of PCD-related genes is upregulated, and nutrients are recycled. Autophagy is an intracellular mechanism involved in PCD modulation and nutrient cycling. As a central component of the autophagy pathway,
    Language English
    Publishing date 2022-04-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2022.840218
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Genomic Analysis of

    Nordstedt, Nathan P / Jones, Michelle L

    Frontiers in microbiology

    2021  Volume 12, Page(s) 653556

    Abstract: Water stress decreases the health and quality of horticulture crops by inhibiting photosynthesis, transpiration, and nutrient uptake. Application of plant growth promoting rhizobacteria (PGPR) can increase the growth, stress tolerance, and overall ... ...

    Abstract Water stress decreases the health and quality of horticulture crops by inhibiting photosynthesis, transpiration, and nutrient uptake. Application of plant growth promoting rhizobacteria (PGPR) can increase the growth, stress tolerance, and overall quality of field and greenhouse grown crops subjected to water stress. Here, we evaluated
    Language English
    Publishing date 2021-05-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2021.653556
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Serratia plymuthica

    Nordstedt, Nathan P / Jones, Michelle L

    Frontiers in microbiology

    2021  Volume 12, Page(s) 788198

    Abstract: High fertilizer rates are often applied to horticulture crop production systems to produce high quality crops with minimal time in production. Much of the nutrients applied in fertilizers are not taken up by the plant and are leached out of the ... ...

    Abstract High fertilizer rates are often applied to horticulture crop production systems to produce high quality crops with minimal time in production. Much of the nutrients applied in fertilizers are not taken up by the plant and are leached out of the containers during regular irrigation. The application of plant growth promoting rhizobacteria (PGPR) can increase the availability and uptake of essential nutrients by plants, thereby reducing nutrient leaching and environmental contamination. Identification of PGPR can contribute to the formulation of biostimulant products for use in commercial greenhouse production. Here, we have identified
    Language English
    Publishing date 2021-12-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2021.788198
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Silencing ATG6 and PI3K accelerates petal senescence and reduces flower number and shoot biomass in petunia

    Lin, Yiyun / Jones, Michelle L

    Plant science. 2021 Jan., v. 302

    2021  

    Abstract: Petal senescence is a form of developmental programmed cell death (PCD) that is regulated by internal and environmental signals. Autophagy, a metabolic pathway that regulates intercellular nutrient recycling, is thought to play an important role in the ... ...

    Abstract Petal senescence is a form of developmental programmed cell death (PCD) that is regulated by internal and environmental signals. Autophagy, a metabolic pathway that regulates intercellular nutrient recycling, is thought to play an important role in the regulation of petal senescence-associated PCD. To characterize the function of two central autophagy genes in petal senescence, we down-regulated Autophagy Gene 6 (PhATG6) and Phosphoinositide 3-Kinase (PhPI3K) using Virus-Induced Gene Silencing (VIGS) in Petunia × hybrida. The silencing of PhATG6 and PhPI3K accelerated petal senescence, thereby reducing flower longevity. Both PhATG6- and PhPI3K-silenced petunias had reduced flower numbers, flower biomass, and vegetative shoot biomass. These phenotypes were intensified when plants were grown under low nutrient conditions. Additionally, two important regulators of senescence, an ethylene biosynthesis gene (PhACS) and a type I metacaspase gene (PhMC1), were suppressed in senescing petals of PhATG6- and PhPI3K-silenced plants. In conclusion, our study identified PhATG6 and PhPI3K as negative regulators of flower senescence and demonstrated the influence of nutrient limitation on the function of autophagy during petal senescence. Our study also found that autophagy genes potentially influence the transcriptional regulation of metacaspases and ethylene biosynthetic genes during petal senescence. The results of this project will be fundamental for future studies of petal senescence and will provide genetic information for future crop improvement.
    Keywords Petunia ; autophagy ; biochemical pathways ; biogeochemical cycles ; biomass ; biosynthesis ; corolla ; ethylene ; ethylene production ; gene silencing ; genes ; information ; longevity ; phenotype ; phosphatidylinositol 3-kinase ; transcription (genetics)
    Language English
    Dates of publication 2021-01
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-light
    ZDB-ID 742010-9
    ISSN 1873-2259 ; 0168-9452
    ISSN (online) 1873-2259
    ISSN 0168-9452
    DOI 10.1016/j.plantsci.2020.110713
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  5. Article ; Online: Nutrient availability and plant phenological stage influence the substrate microbiome in container-grown Impatiens walleriana 'Xtreme Red'.

    Quijia Pillajo, Juan / Chapin, Laura J / Quiroz-Moreno, Cristian D / Altland, James E / Jones, Michelle L

    BMC plant biology

    2024  Volume 24, Issue 1, Page(s) 176

    Abstract: Background: The microbiome plays a fundamental role in plant health and performance. Soil serves as a reservoir of microbial diversity where plants attract microorganisms via root exudates. The soil has an important impact on the composition of the ... ...

    Abstract Background: The microbiome plays a fundamental role in plant health and performance. Soil serves as a reservoir of microbial diversity where plants attract microorganisms via root exudates. The soil has an important impact on the composition of the rhizosphere microbiome, but greenhouse ornamental plants are commonly grown in soilless substrates. While soil microbiomes have been extensively studied in traditional agriculture to improve plant performance, health, and sustainability, information about the microbiomes of soilless substrates is still limited. Thus, we conducted an experiment to explore the microbiome of a peat-based substrate used in container production of Impatiens walleriana, a popular greenhouse ornamental plant. We investigated the effects of plant phenological stage and fertilization level on the substrate microbiome.
    Results: Impatiens plants grown under low fertilization rates were smaller and produced more flowers than plants grown under optimum and high fertilization. The top five bacterial phyla present in the substrate were Proteobacteria, Actinobacteria, Bacteriodota, Verrucomicrobiota, and Planctomycetota. We found a total of 2,535 amplicon sequence variants (ASV) grouped into 299 genera. The substrate core microbiome was represented by only 1.8% (48) of the identified ASV. The microbiome community composition was influenced by plant phenological stage and fertilizer levels. Phenological stage exhibited a stronger influence on microbiome composition than fertilizer levels. Differential abundance analysis using DESeq2 identified more ASVs significantly affected (enriched or depleted) in the high fertilizer levels at flowering. As observed for community composition, the effect of plant phenological stage on microbial community function was stronger than fertilizer level. Phenological stage and fertilizer treatments did not affect alpha-diversity in the substrate.
    Conclusions: In container-grown ornamental plants, the substrate serves as the main microbial reservoir for the plant, and the plant and agricultural inputs (fertilization) modulate the microbial community structure and function of the substrate. The differences observed in substrate microbiome composition across plant phenological stage were explained by pH, total organic carbon (TOC) and fluoride, and across fertilizer levels by pH and phosphate (PO
    MeSH term(s) Fertilizers ; Impatiens ; Microbiota ; Nutrients ; Soil
    Chemical Substances Fertilizers ; Soil
    Language English
    Publishing date 2024-03-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 2059868-3
    ISSN 1471-2229 ; 1471-2229
    ISSN (online) 1471-2229
    ISSN 1471-2229
    DOI 10.1186/s12870-024-04854-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: A Type I and a Type II Metacaspase Are Differentially Regulated during Corolla Development and in Response to Abiotic and Biotic Stresses in Petunia × hybrida

    Chapin, Laura J. / Jones, Michelle L.

    Horticulturae. 2022 Dec. 06, v. 8, no. 12

    2022  

    Abstract: Metacaspases are structural homologs of the metazoan caspases that are found in plants, fungi, and protozoans. They are cysteine proteases that function during programmed cell death, stress, and cell proliferation. A putative metacaspase designated PhMC2 ...

    Abstract Metacaspases are structural homologs of the metazoan caspases that are found in plants, fungi, and protozoans. They are cysteine proteases that function during programmed cell death, stress, and cell proliferation. A putative metacaspase designated PhMC2 was cloned from Petunia × hybrida, and sequence alignment and phylogenetic analysis revealed that it encodes a type II metacaspase. PhMC2 cleaved protease substrates with an arginine residue at the P1 site and cysteine (iodoacetamide) and arginal (leupeptin) protease inhibitors nearly abolished this activity. The activity of PhMC2 was highest at pH 8, and the putative catalytic site cysteine residue was required for optimal activity. Quantitative PCR showed that PhMC2 transcripts were detectable in petunia corollas, styles, and ovaries. Expression patterns were not upregulated during petal senescence but were higher at the middle stages of development when flower corollas were fully open but not yet starting to wilt. PhMC1, a type I metacaspase previously identified in petunia, and PhMC2 were differentially regulated in vegetative tissues in response to biotic and abiotic stresses. PhMC2 expression was upregulated to a greater extent than PhMC1 following Botrytis cinerea infection, while PhMC1 was upregulated more by drought, salinity, and low nutrient stress. These results suggest that petunia metacaspases are involved in flower development, senescence, and stress responses.
    Keywords Animalia ; Botrytis cinerea ; Petunia ; active sites ; arginine ; caspases ; cell proliferation ; corolla ; cysteine ; drought ; flowering ; pH ; phylogeny ; programmed cell death ; quantitative polymerase chain reaction ; salinity ; sequence alignment
    Language English
    Dates of publication 2022-1206
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article ; Online
    ZDB-ID 2813983-5
    ISSN 2311-7524
    ISSN 2311-7524
    DOI 10.3390/horticulturae8121151
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  7. Article: Isolation of Rhizosphere Bacteria That Improve Quality and Water Stress Tolerance in Greenhouse Ornamentals.

    Nordstedt, Nathan P / Jones, Michelle L

    Frontiers in plant science

    2020  Volume 11, Page(s) 826

    Abstract: Water deficit stress is a major contributor to the loss of ornamental crop value due to its negative effects on plant growth and flowering. In addition, post-production water stress can reduce the photosynthetic capacity of plants, negatively impacting ... ...

    Abstract Water deficit stress is a major contributor to the loss of ornamental crop value due to its negative effects on plant growth and flowering. In addition, post-production water stress can reduce the photosynthetic capacity of plants, negatively impacting crop quality at retail and in the consumer's home and garden. While the application of microbe-containing biostimulant products can increase stress tolerance and crop quality, the success of most commercially available biostimulants in greenhouse production systems is inconsistent. To identify beneficial bacteria with consistent biostimulant activity in greenhouse ornamentals, our study isolated bacteria from the rhizosphere of water stressed greenhouse ornamentals. Five species of popular ornamentals were obtained from 15 different commercial greenhouse facilities and then subjected to three cycles of water stress. Over 1,000 bacterial isolates were collected from the rhizosphere and screened
    Language English
    Publishing date 2020-06-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2711035-7
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2020.00826
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  8. Article ; Online: Silencing ATG6 and PI3K accelerates petal senescence and reduces flower number and shoot biomass in petunia.

    Lin, Yiyun / Jones, Michelle L

    Plant science : an international journal of experimental plant biology

    2020  Volume 302, Page(s) 110713

    Abstract: Petal senescence is a form of developmental programmed cell death (PCD) that is regulated by internal and environmental signals. Autophagy, a metabolic pathway that regulates intercellular nutrient recycling, is thought to play an important role in the ... ...

    Abstract Petal senescence is a form of developmental programmed cell death (PCD) that is regulated by internal and environmental signals. Autophagy, a metabolic pathway that regulates intercellular nutrient recycling, is thought to play an important role in the regulation of petal senescence-associated PCD. To characterize the function of two central autophagy genes in petal senescence, we down-regulated Autophagy Gene 6 (PhATG6) and Phosphoinositide 3-Kinase (PhPI3K) using Virus-Induced Gene Silencing (VIGS) in Petunia × hybrida. The silencing of PhATG6 and PhPI3K accelerated petal senescence, thereby reducing flower longevity. Both PhATG6- and PhPI3K-silenced petunias had reduced flower numbers, flower biomass, and vegetative shoot biomass. These phenotypes were intensified when plants were grown under low nutrient conditions. Additionally, two important regulators of senescence, an ethylene biosynthesis gene (PhACS) and a type I metacaspase gene (PhMC1), were suppressed in senescing petals of PhATG6- and PhPI3K-silenced plants. In conclusion, our study identified PhATG6 and PhPI3K as negative regulators of flower senescence and demonstrated the influence of nutrient limitation on the function of autophagy during petal senescence. Our study also found that autophagy genes potentially influence the transcriptional regulation of metacaspases and ethylene biosynthetic genes during petal senescence. The results of this project will be fundamental for future studies of petal senescence and will provide genetic information for future crop improvement.
    MeSH term(s) Aging ; Beclin-1/metabolism ; Beclin-1/physiology ; Flowers/growth & development ; Flowers/metabolism ; Gene Silencing ; Petunia/enzymology ; Petunia/growth & development ; Petunia/metabolism ; Phosphatidylinositol 3-Kinase/metabolism ; Phosphatidylinositol 3-Kinase/physiology ; Plant Proteins/metabolism ; Plant Proteins/physiology ; Plant Shoots/growth & development ; Plant Shoots/metabolism ; Reverse Transcriptase Polymerase Chain Reaction ; Transcriptome
    Chemical Substances Beclin-1 ; Plant Proteins ; Phosphatidylinositol 3-Kinase (EC 2.7.1.137)
    Language English
    Publishing date 2020-10-10
    Publishing country Ireland
    Document type Journal Article
    ZDB-ID 742010-9
    ISSN 1873-2259 ; 0168-9452
    ISSN (online) 1873-2259
    ISSN 0168-9452
    DOI 10.1016/j.plantsci.2020.110713
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  9. Article: Identification of Plant Growth Promoting Rhizobacteria That Improve the Performance of Greenhouse-Grown Petunias under Low Fertility Conditions.

    South, Kaylee A / Nordstedt, Nathan P / Jones, Michelle L

    Plants (Basel, Switzerland)

    2021  Volume 10, Issue 7

    Abstract: The production of greenhouse ornamentals relies on high fertilizer inputs to meet scheduling deadlines and quality standards, but overfertilization has negative environmental impacts. The goals of this study were to identify plant-growth-promoting ... ...

    Abstract The production of greenhouse ornamentals relies on high fertilizer inputs to meet scheduling deadlines and quality standards, but overfertilization has negative environmental impacts. The goals of this study were to identify plant-growth-promoting rhizobacteria (PGPR) that can improve greenhouse ornamental crop performance with reduced fertilizer inputs, and to identify the best measurements of plant performance for assessing the beneficial impact of PGPR on ornamentals. A high-throughput greenhouse trial was used to identify 14 PGPR isolates that improved the flower/bud number and shoot dry weight of
    Language English
    Publishing date 2021-07-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2704341-1
    ISSN 2223-7747
    ISSN 2223-7747
    DOI 10.3390/plants10071410
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Beneficial Bacteria Identified for the Control of

    South, Kaylee A / Peduto Hand, Francesca / Jones, Michelle L

    Plant disease

    2020  Volume 104, Issue 6, Page(s) 1801–1810

    Abstract: ... Botrytis ... ...

    Abstract Botrytis cinerea
    MeSH term(s) Botrytis ; Fungicides, Industrial ; Petunia ; Plant Diseases ; Spores, Fungal
    Chemical Substances Fungicides, Industrial
    Language English
    Publishing date 2020-04-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-10-19-2276-RE
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Z 2043: Show issues

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