《植物生理学报》 2010, 46(10): 1020-1024

盐诱导的依赖叶黄素循环的热耗散提高了小麦的耐盐性

王倩, 高雪, 彭建云, 王宝山*

山东师范大学生命科学学院逆境植物重点实验室, 济南250014

通信作者：王宝山；E-mail: bswang@sdnu.edu.cn；Tel: 0531-86180197

摘　要：

以小麦抗盐品种 ‘DK961’ 和盐敏感品种 ‘LM15’ 为材料, 探讨盐胁迫条件下叶黄素循环与膜脂过氧化的关系。结果 表明: 200 mmol•L-1 NaCl 处理后二者地上部分鲜重、含水量、K+ 含量显著下降, Na+ 含量、Na+/K+ 比、丙二醛含量显著升 高, 膜透性显著增大, ‘LM15’ 的变化幅度均明显大于 ‘DK961’, 而 ‘LM15’ 脱环氧化状态(A+Z)/(A+Z+V)的增加明显小于‘DK961’。这表明盐胁迫下‘DK961’ 通过增加依赖叶黄素循环的热耗散减轻了膜脂过氧化, 提高其耐盐性。

关键词：小麦; 盐胁迫; 膜脂过氧化; 叶黄素循环; 耐盐性

收稿：2010-07-15   修定：2010-08-19

资助：国家自然科学基金(30870138)和国家海洋“863” 重点项目(2007AA091701)。

Salt-Induced Xanthophyll Cycle-Dependent Thermal Dissipation Improved Salt Tolerance of Wheat (Triticum aestivum L.)

WANG Qian, GAO Xue, PENG Jian-Yun, WANG Bao-Shan*

Key Laboratory of Plant Stress Research, College of Life Sciences, Shandong Normal University, Jinan 250014, China

Corresponding author: WANG Bao-Shan; E-mail: bswang@sdnu.edu.cn; Tel: 0531-86180197

Abstract:

In this paper, the relationship between lipid peroxidation and xanthophyll cycle was examined using salt-tolerant wheat (Triticum aestivum) variety ‘Dekang 961’ (‘DK961’) and salt-sensitive variety ‘Lumai 15’(‘LM15’) under short-term NaCl stress. The results showed that the shoot fresh weight, water content and K⁺content all significantly decreased in both cultivars treated with 200 mmol·L^-1 NaCl for 3 d, while Na⁺ content, Na⁺/K⁺ ratio, malondialdehyde (MDA) content as well as membrane permeability significantly increased. The changing degree in ‘LM15’ was much higher than that in ‘DK961’. However, deoxy cyclic state (A+Z)/(A+Z+V)increased more in ‘DK961’ than in ‘LM15’. These results suggested that ‘DK961’ is more salt-tolerant than‘LM15’ partly via increasing a xanthophyll cycle-dependent thermal dissipation to maintain a low level of lipid peroxidation.

Key words: wheat; salt stress; lipid peroxidation; xanthophyll cycle; salt tolerance