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Programmed cell death is responsible for replaceable bud senescence in chestnut (Castanea mollissima BL.)
Guangpeng Wang1, Zhihong Zhang, Dejun Kong
1Team of Biotechnology and Genetic Improvement of Fruit Trees, Shenyang Agricultural University, 110161, Shenyang, People's Republic of China.
Plant Cell Reports
|June 5, 2012
Summary
Programmed cell death (PCD) drives the senescence of replaceable buds in chestnut cultivar 'Tima zhenzhu'. This finding offers potential for improving chestnut cultivation and production by manipulating bud development.
Area of Science:
- Plant Biology
- Cellular Biology
- Molecular Biology
Background:
- Chestnut cultivar 'Tima zhenzhu' exhibits a 'replaceable bud' trait, where auxiliary buds senesce post-fruiting.
- This unique morphology is advantageous for intensive cultivation and increased yield compared to wild types.
Purpose of the Study:
- To investigate the cellular mechanisms underlying the senescence of replaceable buds in chestnut.
- To determine if programmed cell death (PCD) is involved in this senescence process.
Main Methods:
- Buds from 'Tima zhenzhu' and wild-type 'Dabanhong' chestnuts were sampled from 20 to 40 days post-flowering.
- DNA degradation, cell death ratio (via flow cytometry), and nuclear morphology (propidium iodide staining) were analyzed.
- Ultrastructural changes in bud cells were examined.
Main Results:
- DNA degradation was observed in 'Tima zhenzhu' buds before visible senescence, unlike in 'Dabanhong'.
- The ratio of PCD cells was significantly higher in 'Tima zhenzhu' throughout the sampling period.
- Key PCD indicators like chromatin condensation and DNA cleavage were identified in 'Tima zhenzhu' bud cells.
Conclusions:
- The senescence of replaceable buds in chestnut is mediated by programmed cell death (PCD).
- This study is the first to report PCD in vegetative bud senescence in a woody plant species.
- Understanding and manipulating PCD in chestnut buds could lead to improved fruit-branch development and agricultural practices.
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