Ultrastructural and biochemical changes in chloroplasts during Brassica napus senescence

Ghosh, Sibdas; Mahoney, Sean R.; Penterman, Jon N; Peirson, David R.; Dumbroff, E. B.

doi:10.1016/s0981-9428(01)01296-7

Cited by 62 publications

(27 citation statements)

References 26 publications

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“…Reduction of photosynthesis under salt and various environmental stresses has been documented (Delfi ne et al, 1999;Ghosh et al, 2001). In the present study, salt stress induced changes in chlorophyll contents and chlorophyll fl uorescence in the 3 rd leaves of seedlings ( Table 2).…”

Section: Discussionsupporting

confidence: 57%

Regulation of Ammonium Accumulation during Salt Stress in Rice (Oryza sativaL.) Seedlings

Nguyen

Shim

Kobayashi

et al. 2005

Plant Production Science

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Section: Discussionsupporting

confidence: 57%

Regulation of Ammonium Accumulation during Salt Stress in Rice (Oryza sativaL.) Seedlings

Nguyen

Shim

Kobayashi

et al. 2005

Plant Production Science

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“…The precise role of the dilated ER during abscission is currently unknown. An additional interesting observation was that chloroplasts located distal to the point of fracture initiation were swollen with numerous plastoglobuli, as has been reported for senescing chloroplasts (Guiamet et al, 1999;Ghosh et al, 2001).…”

Section: Abscission-associated Genes Are Differentially Expressed On supporting

confidence: 62%

Programmed Cell Death Occurs Asymmetrically during Abscission in Tomato

et al. 2011

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Abscission occurs specifically in the abscission zone (AZ) tissue as a natural stage of plant development. Previously, we observed delay of tomato (Solanum lycopersicum) leaf abscission when the LX ribonuclease (LX) was inhibited. The known association between LX expression and programmed cell death (PCD) suggested involvement of PCD in abscission. In this study, hallmarks of PCD were identified in the tomato leaf and flower AZs during the late stage of abscission. These included loss of cell viability, altered nuclear morphology, DNA fragmentation, elevated levels of reactive oxygen species and enzymatic activities, and expression of PCD-associated genes. Overexpression of antiapoptotic proteins resulted in retarded abscission, indicating PCD requirement. PCD, LX, and nuclease gene expression were visualized primarily in the AZ distal tissue, demonstrating an asymmetry between the two AZ sides. Asymmetric expression was observed for genes associated with cell wall hydrolysis, leading to AZ, or associated with ethylene biosynthesis, which induces abscission. These results suggest that different abscission-related processes occur asymmetrically between the AZ proximal and distal sides. Taken together, our findings identify PCD as a key mechanism that occurs asymmetrically during normal progression of abscission and suggest an important role for LX in this PCD process.

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“…Interestingly, drought caused an increase in the number and size of plastoglobules, more in females than in males. The appearance of plastoglobules in chloroplasts is usually considered as a symptom of senescence, since they are regarded as lipid droplets derived from thylakoid degradation (Ghosh et al, 2001;Dalla-Vecchia et al, 2005). Actually, previous studies have suggested that drought-stressed females exhibited higher malonaldehyde (MDA) content than drought-stressed males (Xu et al, 2008a;Chen et al, 2010b;Zhang et al, 2010a).…”

Section: Tablementioning

confidence: 99%

Populus cathayana males exhibit more efficient protective mechanisms than females under drought stress

Zhang

Chen

Duan

et al. 2012

Forest Ecology and Management

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Ultrastructural and biochemical changes in chloroplasts during Brassica napus senescence

Cited by 62 publications

References 26 publications

Regulation of Ammonium Accumulation during Salt Stress in Rice (Oryza sativaL.) Seedlings

Regulation of Ammonium Accumulation during Salt Stress in Rice (Oryza sativaL.) Seedlings

Programmed Cell Death Occurs Asymmetrically during Abscission in Tomato

Populus cathayana males exhibit more efficient protective mechanisms than females under drought stress

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