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The overaccumulation of glycinebetaine alleviated damages to PSII of wheat flag leaves under drought and high temperature stress combination

文献类型： 外文期刊

作者： Wang, Gui-Ping 1 ; Tian, Feng-Xia 2 ; Zhang, Meng 2 ; Wang, Wei 2 ;

作者机构： 1.Shandong Inst Pomol, Tai An 271000, Shandong, Peoples R China

2.Shandong Agr Univ, Coll Life Sci, State Key Lab Crop Sci Biol, Tai An 271018, Shandong, Peoples R China

关键词： Glycinebetaine;Chlorophyll;fluorescence;Oxygen-evolving complex;PSII reaction center;Stress combination;Transgenic wheat

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： To analyze the physiological mechanisms underlying the increased tolerance to drought and high temperature stress combination by overproduction of glycinebetaine (GB) in wheat, a transgenic wheat line T6 and its wild-type (WT) Shi4185 were used. The transgenic line was generated by introducing a gene encoding betaine aldehyde dehydrogenase (BADH) into a wheat line Shi4185. The gene was cloned from Garden Orache (Atriplex hortensis L.). Wheat plants were exposed to drought (withholding irrigation), high temperature stress (40 A degrees C), and their combination at the flowering stage. Analyses of oxygen-evolving activity and photosystem II (PSII) photochemistry, modulated chlorophyll fluorescence, rapid fluorescence induction kinetics, and the polyphasic fluorescence transients (OJIP) were used to evaluate PSII photochemistry in wheat plants. The results suggest that the PSII in transgenic plants showed higher resistance than that in wild-type plants under the stresses studied here, this increased tolerance was associated with an improvement in stability of the oxygen-evolving complex and the reaction center of PSII; streptomycin treatment can impair the protective effect of overaccumulated GB on PSII. The overaccumulated GB may protect the PSII complex from damage through accelerating D1 protein turnover to alleviate photodamage. The results also suggest that the PSII under combined high temperature and drought stress shows higher tolerance than under high temperature stress alone in both transgenic and wild-type plants.

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