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Roles of xanthophylls and exogenous ABA in protection against NaCl-induced photodamage in rice (Oryza sativa L) and cabbage (Brassica campestris)

文献类型： 外文期刊

作者： Zhu, Su-Qin 1 ; Chen, Ming-Wei 1 ; Ji, Ben-Hua 2 ; Jiao, De-Mao 3 ; Liang, Jian-Sheng 1 ;

作者机构： 1.Yangzhou Univ, Coll Biosci & Biotechnol, Key Lab Crop Genet & Physiol Jiangsu Prov, Yangzhou 225009, Peoples R China

2.Nantong Univ, Sch Life Sci, Nantong 226007, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agribiol Genet & Physiol, Nanjing 210014, Peoples R China

关键词： sodium chloride: 7647-14-5;photosystem II;xanthophyll: 127-40-2;salt stress;non-photochemical quenching;photosynthetic electron transport;energy dissipation;photoprotective mechanism;photodamage tolerance

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Changes in actual efficiency of PS II photochemistry, non-photochemical quenching (NPQ), content of xanthophylls and kinetics of de-epoxidation were studied in ABA-fed and non-ABA-fed leaves of rice and cabbage under NaCl stress. Salt stress induced more progressive decrease in actual efficiency of PS II photochemistry (PS II), higher reduction state of PS II, and a small significant increase in NPQ in NaCl-sensitive rice plants as compared with NaCl-tolerant cabbage plants, whereas exogenously supplied ABA alleviated the decrease in actual efficiency of PS II photochemistry (PS II), induced a lower reduction state of PS II, and caused higher capacity of NPQ in ABA-fed plants than in non-ABA-fed plants. As a result, there were higher activities of photosynthetic electron transport, higher capacity of energy dissipation, and lower cumulation of excess light in cabbage than in rice plants, and in ABA-fed leaves than in non-ABA-fed leaves. The effect of ABA was more efficient in cabbage than in rice plants. Addition of exogenous ABA resulted in enhancement of the size of the xanthophyll cycle pool, promotion of de-epoxidation of the xanthophyll cycle components, and a rise in the level of NPQ by altering the kinetics of de-epoxidation of the xanthophyll cycle. Protection from photodamage appears to be achieved by coordinated contributions by exogenous ABA and xanthophyll cycle-mediated NPQ. This variety of photoprotective mechanisms may be essential for conferring photodamage tolerance under NaCl stress.

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