NDLI: Aging and senescence of the leaf organ

Content Provider	Springer Nature Link
Author	Lim, Pyung Ok Nam, Hong Gil
Copyright Year	2007
Abstract	Leaf senescence is a sequence of biochemical and physiological events comprising the final stage in leaf development. It encompasses the period from a fully expanded mature state up to the death, thereby limiting longevity. The changes occurring during leaf senescence are very complex but highly regulated, and are genetically programmed with actions coordinated at the cellular, tissue, organ, and organism levels. A major breakthrough in our molecular understanding of this phenomenon has been achieved through the characterization of various mutants and senescence-associated genes, including regulatory genes. In particular, a genetic screening and assay system for leaf senescence has been well established inArabidopsis, which led leaf senescence into the realm of genetic subject along with the rich genetic and genomic resources in this model plant. These advances have not only revealed the existence of a complex regulatory network of senescence-associated signaling pathways, but have also allowed us to postulate the molecular mechanisms for signal perception, execution, and regulation. The key regulatory genes identified to date encode a variety of proteins, including transcription regulators and signal-transduction proteins, regulators of protein degradation, proteins associated with phytohormone pathways, and regulators of metabolism. Elucidation of their roles in leaf senescence and analyses of senescence regulatory pathways, including systems-level approaches, will increase our knowledge of the networks involved in senescence activity.
Starting Page	291
Ending Page	300
Page Count	10
File Format	PDF
ISSN	12269239
Journal	Journal of Plant Biology
Volume Number	50
Issue Number	3
e-ISSN	18670725
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	developmental aging leaf senescence longevity nutrient salvage programmed cell death Plant Sciences Plant Breeding/Biotechnology Plant Genetics & Genomics Plant Systematics/Taxonomy/Biogeography Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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