An Analysis of the Regulation and Gene Expression of Leaf Senescence in Arabidopsis PDF Download
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Author: Louis Michael Weaver
Publisher:
ISBN:
Category :
Languages : en
Pages : 460
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Author: Louis Michael Weaver
Publisher:
ISBN:
Category :
Languages : en
Pages : 460
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Book Description
Author: L.D. Nooden
Publisher: Elsevier
ISBN: 0323145957
Category : Science
Languages : en
Pages : 555
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Book Description
Senescence and Aging in Plants reviews the state of knowledge in the processes involved in plant senescence and aging. The book begins by discussing the emergence of senescence as a concept; experimental analysis of senescence; and patterns of senescence. It then examines membrane deterioration during senescence; photosynthesis in relation to leaf senescence; senescence of detached plant organs; changing patterns of nucleic acid and protein synthesis during senescence; and degradative and associated assimilatory aspects of nitrogen removal. This is followed by chapters on aspects of ethylene that may impinge upon its role in promoting senescence of higher plants; the role of cytokinins in plant senescence; the promoters and retardants of senescence; and the role of calcium in plant senescence. The concept of whole plant senescence is discussed, which can be subdivided into patterns, correlative controls, cessation of vegetative growth, declining assimilatory processes, assimilate partitioning, and hormonal controls. The final chapters cover the deterioration of cellular membranes during the plant aging process and seed aging.
Author: Yongfeng Guo
Publisher:
ISBN:
Category :
Languages : en
Pages : 372
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Author: Md. Sharif Hasan
Publisher:
ISBN: 9780355499957
Category : Chlorophyll
Languages : en
Pages : 60
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Book Description
Abstract: Leaf senescence is the final stage of leaf development that is characterized by highly regulated genetic programs. This process involves recycling and recovery of the nutrients and relocating them to the developing part of the plant for high yield of fruits and grains. In this project we focused on four genes (WRKY45, NAC084, NAC100 and undesignated NAC) that coded for either WRKY or NAC transcription factors to determine their effects on leaf senescence by assaying both chlorophyll and protein levels, analyzing chlorophyll and protein degradation rates and quantifying the transcript abundance of senescence marker genes, WRKY75, NIT2, DGR2 and Lhcb2. wrky45 mutants showed early senescence. We observed lower chlorophyll level and faster chlorophyll degradation rate that was supported by the real time qPCR data showing greater upregulation in SURG and downregulation in SDRG. These findings suggest that WRKY45 gene has a negative regulatory effect in WT plants. In contrast, nac084 mutant showed delayed senescence. We found higher chlorophyll level and slower chlorophyll degradation rate that was supported by the real time qPCR data showing downregulation of SURG and upregulation of SDRG. These findings suggest a positive regulatory effect of NAC084 in senescence. NAC100 did not show any significant changes in leaf senescence. On the other hand, undesignated NAC behaved like a normal gene as the und-nac-1 mutant was not affected by a T-DNA insertion and may not have disrupted gene expression.
Author: Yasuhito Sakuraba
Publisher: Frontiers Media SA
ISBN: 2889660761
Category : Science
Languages : en
Pages : 154
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Book Description
This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Author: Betania Ferraz Quirino
Publisher:
ISBN:
Category :
Languages : en
Pages : 188
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Author: Yongfeng Guo
Publisher: Frontiers Media SA
ISBN: 2889746879
Category : Science
Languages : en
Pages : 136
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Book Description
Author: Susheng Gan
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Book Description
![Characterization of Genes Involved In Development and Senescence [electronic Resource] PDF](https://books.google.com/books/content/images/frontcover/x3wauAEACAAJ?fife=w80-h100)
Author: Marianne Hopkins (nee Kaup)
Publisher: University of Waterloo
ISBN:
Category : Biology
Languages : en
Pages :
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Author: Soumi Barman
Publisher:
ISBN: 9781369861679
Category : Arabidopsis thaliana
Languages : en
Pages : 66
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Book Description
Abstract: Leaf senescence, which is the final process of leaf development, involves a complex regulation of thousands of genes to recover and recycle valuable nutrients and mobilize them to growing part of the plant for high yield of fruits and grains. A greater understanding of the complex senescence gene regulation could be helpful for higher crop yield. This study is focused on three genes (ATX1, ATX3 and ATX4) that code for H3K4me3 methyl transferases to investigate their effect on flowering transition time, and their importance during senescence by assaying total chlorophyll and protein levels, and quantifying the mRNA expression of senescence marker gene WRKY75. An additive early flowering phenotype was observed for double mutants. However, no senescence alteration was found for double mutants. An increased level of total chlorophyll was shown by single mutant atx4. Significant differences for total protein were observed in leaf 6 vs. leaf 7 for double mutants atx1atx3 and atx1atx4, suggesting a faster protein degradation rate or smaller variability (reduced confidence interval) in leaf 7 data. Due to the gene redundancy of the ten-member ATX family, knocking out two genes may not adequately affect the function of H3K4 methyltransferase activity. Therefore, phenotypic analyses of triple and quadruple mutants of senescence-expressed H3K4me3 methyltransferase coding genes may show stronger senescence phenotypes. Of importance, these data show that significantly early flowering does not dictate early leaf senescence.
