Leaf Senescence

Lim, Pyung Ok; Kim, Hyo Jung; Nam, Hong Gil

doi:10.1146/annurev.arplant.57.032905.105316

Cited by 1,808 publications

(1,824 citation statements)

References 82 publications

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“…Internal factors include age, phytohormones and reproductive development, whereas external cues include stress conditions such as nutrient deficiency, pathogen infection, drought, low and high temperature and shading. Thus, the expression patterns of numerous genes are common between such stress responses and leaf senescence (Lim et al 2007). …”

Section: Role Of Plastoglobules During Leaf Senescencementioning

confidence: 99%

“…Up-regulated during senescence, they trigger leaf senescence by signal perception and transduction such as receptor-like kinases and transcription factors (Quirino et al 2000;Lim et al 2007). Among at least 800 SAGs identified in Arabidopsis, 20 different families of transcription factors are significantly overexpressed during senescence.…”

Section: Role Of Plastoglobules During Leaf Senescencementioning

confidence: 99%

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A mechanism implicating plastoglobules in thylakoid disassembly during senescence and nitrogen starvation

Besagni

Kessler

2012

Planta

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Plastoglobules are lipid droplets present in all plastid types. In chloroplasts, they are connected to the thylakoid membrane by the outer lipid half-bilayer. The plastoglobule core is composed of neutral lipids most prominently the prenylquinones, triacylglycerols, fatty acid phytyl esters but likely also unknown compounds. During stress and various developmental stages such as senescence, plastoglobule size and number increase due to the accumulation of lipids. However, their role is not limited to lipid storage. Indeed, the characterization of the plastoglobule proteome revealed the presence of enzymes. Importantly it has been demonstrated that these participate in isoprenoid lipid metabolic pathways at the plastoglobule, notably in the metabolism of prenylquinones. Recently, the characterization of two phytyl ester synthases has established a firm metabolic link between PG enzymatic activity and thylakoid disassembly during chloroplast senescence and nitrogen starvation.

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Section: Role Of Plastoglobules During Leaf Senescencementioning

confidence: 99%

Section: Role Of Plastoglobules During Leaf Senescencementioning

confidence: 99%

A mechanism implicating plastoglobules in thylakoid disassembly during senescence and nitrogen starvation

Besagni

Kessler

2012

Planta

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“…Dramatic changes in cell structure and metabolism occur during leaf senescence, including the degradation of chloroplasts, mitochondria, and nuclei, and simultaneous catabolism of chlorophyll pigments, nucleic acids, proteins, and lipids. The nutrients released from senescing leaves are transported to newly-developing leaves, fruits, or seeds (Buchanan-Wollaston et al, 2005;Lim et al, 2007a;Munné-Bosch and Alegre, 2004).…”

Section: Introductionmentioning

confidence: 99%

Overexpression of a LAM Domain Containing RNA-Binding Protein LARPIc Induces Precocious Leaf Senescence in Arabidopsis

Zhang

Jia

Yang

et al. 2012

Molecules and Cells

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Leaf senescence is the final stage of leaf life history, and it can be regulated by multiple internal and external cues. La-related proteins (LARPs), which contain a well-conserved La motif (LAM) domain and normally a canonical RNA recognition motif (RRM) or noncanonical RRM-like motif, are widely present in eukaryotes. Six LARP genes (LARP1a-1c and LARP6a-6c) are present in Arabidopsis, but their biological functions have not been studied previously. In this study, we investigated the biological roles of LARP1c from the LARP1 family. Constitutive or inducible overexpression of LARP1c caused premature leaf senescence. Expression levels of several senescence-associated genes and defense-related genes were elevated upon overexpression of LARP1c. The LARP1c null mutant 1c-1 impaired ABA-, SA-, and MeJA-induced leaf senescence in detached leaves. Gene expression profiles of LARP1c showed age-dependent expression in rosette leaves. Taken together, our results suggest LARP1c is involved in regulation of leaf senescence.

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“…Endogenous factors include reproductive development, hormones, reactive oxygen species (ROS) and environmental factors include biotic and abiotic stresses. Senescence involves the active turnover and recapture of cellular materials for use in the growing parts such as developing seeds (Lim et al 2007). Leaf senescence is an important determinant of crop productivity.…”

Section: Introductionmentioning

confidence: 99%

Delayed expression of SAGs correlates with longevity in CMS wheat plants compared to its fertile plants

Semwal

Singh

Khanna‐Chopra

2014

Physiol Mol Biol Plants

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Reproductive sinks regulate monocarpic senescence in crop plants. Monocarpic senescence was studied in wheat fertile (cv. HW 2041) and its isonuclear cytoplasmic male sterile (CMS) line. CMS plants exhibited slower rate of senescence accompanied by longer green leaf area duration and slower deceleration in chlorophyll, protein content, P N and rubisco content coupled with lower protease activities than fertile (F) plants. CMS plants also exhibited lower ROS levels and less membrane damage than F plants. CMS plants maintained better antioxidant defense, less oxidative damage in chloroplast and higher transcript levels of both rbcL and rbcS genes during senescence than F plants. F plants exhibited early induction and higher expression of SAGs like serine and cysteine proteases, glutamine synthetases GS1 and GS2, WRKY53 transcription factor and decline in transcript levels of CAT1 and CAT2 genes than CMS plants. Hence, using genetically fertile and its CMS line of wheat it is confirmed that delayed senescence in the absence of reproductive sinks is linked with slower protein oxidation, rubisco degradation and delayed activation of SAGs. Better antioxidant defense in chloroplasts at later stages of senescence was able to mitigate the deleterious effects of ROS in CMS plants. We propose that delayed increase in ROS in cytoplasmic male sterile wheat plants resulted in delayed activation of WRKY53, SAGs and the associated biochemical changes than fertile plants.

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Leaf Senescence

Cited by 1,808 publications

References 82 publications

A mechanism implicating plastoglobules in thylakoid disassembly during senescence and nitrogen starvation

A mechanism implicating plastoglobules in thylakoid disassembly during senescence and nitrogen starvation

Overexpression of a LAM Domain Containing RNA-Binding Protein LARPIc Induces Precocious Leaf Senescence in Arabidopsis

Delayed expression of SAGs correlates with longevity in CMS wheat plants compared to its fertile plants

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