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Position: Home > Articles > Respiratory Response of Dormant Nectarine Vegetative Buds to High Temperature Stress Journal of Integrative Agriculture 2013,12 (1)

Respiratory Response of Dormant Nectarine Vegetative Buds to High Temperature Stress

作  者:
Tan Yue;Li Ling;Leng Chuan-yuan;Li Dong-mei;Chen Xiu-de;Gao Dong-sheng
单  位:
Shandong Agr Univ, Natl Res Ctr Apple Engn & Technol, State Key Lab Crop Biol, Coll Hort Sci & Engn, Tai An 271018, Shandong, Peoples R China
关键词:
high temperature stress;dormancy release;respiration;nectarine;vegetative buds
摘  要:
High temperature stress (HT) is efficient in breaking endo-dormancy of perennial trees. The effects of HT (50 degrees C) on the respiration of dormant nectarine (Prunus persica var. nectariana cv. Shuguang) vegetative buds were evaluated in the research. We found that bud respiration was transiently inhibited by HT and the pentose phosphate pathway (PPP) and the cytochrome C pathway (CYT) were significantly affected. On the substrate level, PPP was activated in the HT-treated buds compared with the control group. However, the activation did mot occur until hours after HT treatment. The tricarboxylic acid cycle (TCA) in both the HT-treated buds and in the control group proceeded at a low level most of the time compared with total respiration. On the electron transfer level, CYT was transiently inhibited by HT but became significantly active in the later stage. CYT operation in the control group exhibited an attenuation process. The alternative pathway (ALT) fluctuated both in the HT-treated samples and in the control. The results suggest that the temporary CYT inhibition and the following PPP activation may be involved in HT-induced bud dormancy release and budburst mechanisms.

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