期刊
PHOTOSYNTHETICA
卷 49, 期 4, 页码 523-530出版社
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-011-0065-4
关键词
Cerasus humilis Bunge; energy dissipation; recovery; violaxanthin; violaxanthin de-epoxidase; water stress; xanthophyll cycle; zeaxanthin; zeaxanthin epoxidase
资金
- National Natural Science Foundation of China [30800876]
- National Natural Science Foundation of Heilongjiang Province [C201017]
- Fundamental Research Funds for the Central Universities [DL09CA09]
- Postgraduate Dissertation Funds [STIP10]
- Northeast Forestry University [YTTP-1011-08]
Periodic drought fluctuation is a common phenomenon in Northwest China. We analyzed the response of Chinese dwarf cherry (Cerasus humilis) seedlings, a dwarf shrub species with considerably strong adaptabilities, exposed to water stress (WS) by withholding water for 21 d, and subsequent recovery of 7 d. Leaf relative water content (LRWC), net photosynthetic rate (P (N)), maximal quantum yield of PSII photochemistry (F-v/F-m), and effective quantum yield of PSII photochemistry (I broken vertical bar(PSII)) decreased with increasing water deficit. In contrast, the nonphotochemical quenching of Chl fluorescence (NPQ) significantly increased, as well as the amounts of violaxanthin (V) + antheraxanthin (A) + zeaxanthin (Z). In the whole levels, the photosynthetic pigment composition did not display significant changes in WS seedlings. However, the de-epoxidation state of xanthophyll cycle pigments [(Z+0.5A)/VAZ ] generally exhibited higher values in WS seedlings. The significant inhibition of de-epoxidation by dithiothreitol (DTT) and negligible changes of epoxidation of Z by glucosamine (Gla) were both observed; the slight but stably upregulated transcript level of violaxanthin de-epoxidase (VDE) and downregulated zeaxanthin epoxidase (ZEP) expression profile were found during WS period, indicating that they were regulated on post-transcript levels. VDE activity, via the accumulation of Z and A, which confers a greater capacity of photoprotection, appears to contribute to the survival of severely stressed plants.
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