《植物生理学报》 2009, 45(9): 851-854

外源Ca²⁺ 对高温强光胁迫下灌浆期小麦叶片光合机构运转的影响

李利红^1,2, 杨亚军³, 赵会杰^3,*, 马培芳³

1 河南农业大学农学院, 郑州450002; 2 郑州牧业工程高等专科学校药物工程系, 郑州450011; 3 河南农业大学生命科学学院,郑州450002

通信作者：赵会杰；E-mail: zhaohj303@163.com；Tel: 0371-63555319

摘　要：

灌浆期叶面喷施 10 mmol•L-1 CaCl 对高温强光胁迫下小麦叶片光合电子传递、放氧速率、叶绿素荧光参数和 D1 蛋 白的影响结果表明, Ca2+ 预处理可保护D1 蛋白, 削弱其降解, 提高光系统 I (PSI)和光系统II (PSII)电子传递速率、全链电子 传递速率、净光合速率(Pn)、PSII 最大光化学效率(Fv/Fm)、PSII 实际光化学效率(ΦPSII)和光化学猝灭(qP), 维持较低的 Fo, 最 终导致小麦适应高温强光的能力提高。

关键词：小麦; 高温强光胁迫; Ca2+; 光合电子传递速率; 叶绿素荧光参数; D1蛋白

收稿：2009-05-18   修定：2009-07-31

资助：国家自然科学基金项目(30671214)。

Effects of Exogenous Ca²⁺ on the Photosynthetic Apparatus in Wheat (Triticum aestivum L.) Leaves under Heat and High Irradiance Stress

LI Li-Hong^1,2, YANG Ya-Jun³, ZHAO Hui-Jie^3,*, MA Pei-Fang³

¹College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China; ²Department of Pharmaceutical Engineering, Zhengzhou College of Animal Husbandry Engineering, Zhengzhou 450011, China; ³College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China

Corresponding author: ZHAO Hui-Jie; E-mail: zhaohj303@163.com; Tel: 0371-63555319

Abstract:

This article aimed at proving the effects of Ca²⁺ on photosynthetic apparatus in leaves of wheat (Triticum aestivum) at filling stage under high temperature and irradiance stress. The results showed that pretreatment with Ca²⁺ at the concentration of 10 mmol·L^-1 protected D1 protein and alleviated its degradation. As a result, higher electron transport rate in PSI, PSII and whole chain, Pn, Fv/Fm, Φ_PSII, q_P and lower Fo were kept under high temperature and irradiance stress. Finally, adaptability of wheat was improved under high temperature and irradiance stress.

Key words: wheat; high temperature and irradiance stress; Ca²⁺; photosynthetic electron transport rate; chlorophyll fluorescence parameters; D1 protein