Photosynthesis pp 217-230 | Cite as

Leaf Senescence and Transformation of Chloroplasts to Gerontoplasts

  • Basanti Biswal
  • Pranab K. Mohapatra
  • Udaya C. Biswal
  • Mukesh K. Raval
Chapter
Part of the Advances in Photosynthesis and Respiration book series (AIPH, volume 34)

Summary

Senescence of green leaves brings about several structural and functional alterations in the cells. The process causes modifications in mitochondrial cristae, condensation of the nucleus, shrinkage of chloroplasts and extensive alteration of thylakoid structure. Senescence-induced changes in chloroplasts are extensive. These changes during senescence result in transdifferentiation of a chloroplast into a gerontoplast, a plastid form with unique structural features and physiology. During leaf senescence, the cells lose essential macromolecules including proteins, lipids and nucleic acids. The stroma proteins and lipids of the thylakoid membrane are the major targets for degradation. In addition to macromolecular degradation, the process causes loss in the photosynthetic pigments, namely chlorophylls and carotenoids. The enzymes that participate in chlorophyll degradation and their regulation are now known. However, the mechanism of degradation of carotenoids still remains a mystery.

Macromolecular degradation and mobilization of the breakdown products that participate in the nutrient recycling mechanism are mediated by up-regulation of senescence-related genes. These genes are known as senescence-associated genes (SAGs), many of which have been cloned and characterized. Data are now available on signaling systems associated with expression of SAGs. Down-regulation of photosynthetic genes, cellular sugar-sensing mechanisms, phytohormones and reactive oxygen species are likely to play major roles in the signal transduction pathway in the initiation, progression and termination of the senescence process. Leaf senescence is directly related to plant productivity and therefore its implication in the area of agricultural biotechnology is important. However, its biotechnological application will be possible only when some of the outstanding fundamental questions relating to the process are addressed.

Keywords

Thylakoid Membrane Leaf Senescence Senescent Leaf Dark Induce Senescence Glyoxylate Pathway 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations:

Chl

– Chlorophyll;

FCC

– Fluorescent chlorophyll catabolite;

pFCC

– Primary fluorescent chlorophyll catabolite;

LHC

– Light-harvesting complex;

mFCC

– Modified fluorescence chlorophyll catabolite;

NCC

– Non-fluorescent chlorophyll catabolite;

PAO

– Pheophorbide a oxygenase;

PCD

– Programmed cell death;

RCC

– Red chlorophyll catabolite;

ROS

– Reactive oxygen species;

Rubisco

– Ribulose-1,5-bisphosphate carboxylase/oxygenase;

SAG

– Senescence associated gene;

SDG

– Senescence down-regulated gene

Notes

Acknowledgements

The authors are thankful to the Department of Science and Technology, Government of India, New Delhi for financial support in the form of a major research grant (SP/SO/A-71/99) to B.B.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Basanti Biswal
    • 1
  • Pranab K. Mohapatra
    • 1
  • Udaya C. Biswal
    • 1
  • Mukesh K. Raval
    • 2
  1. 1.School of Life SciencesSambalpur UniversitySambalpurIndia
  2. 2.Department of ChemistryGM College (Autonomous)SambalpurIndia

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