• 研究论文 •

### 干旱胁迫下结缕草叶片抗坏血酸与相关生理指标变化的品种差异研究

1. 1.肇庆学院生命科学学院,广东 肇庆 526061;
2.湖南农业大学生物科学技术学院,湖南 长沙 410128
• 出版日期:2013-08-20 发布日期:2013-08-20
• 通讯作者: E-mail:534537324@qq.com
• 作者简介:俞乐(1974-),女,广西北流人,副教授,博士。E-mail:yule@zqu.edu.cn
• 基金资助:
广东省自然科学基金(S2011040001280, S2012010010680),中国博士后科学基金(2012M511723),肇庆学院科研基金青年项目(1003, 1105),肇庆学院教学研究项目(jy201141)和肇庆学院大学生创新性试验计划项目(H1058012035)资助。

### A study on the changes of ascorbic acid and related physiological indexes in different cultivars of Zoysia under drought stress

YU Le1, LIU Yong-hai1,2, ZHOU Li-ping1, LIANG Guo-qiu1

1. 1.College of Life Sciences, Zhaoqing University, Zhaoqing 526061, China;
2.College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China
• Online:2013-08-20 Published:2013-08-20

Abstract: The changes of foliar ascorbic acid and related physiological indexes in Zoysia japonica and Z. tenuifolia under drought stress were studied in a pot trial. The results showed that the dynamic change rules of foliar ascorbic acid and related physiological indexes were similar in Z. japonica and Z. tenuifolia under drought stress, but significant differences were still observed in these two cultivars. For example, the level and redox status of ascorbic acid in these two cultivars were increased at the early drought stress stages, and then decreased at the later drought stress stages, but the decreased time was earlier in Z. japonica compared with Z. tenuifolia. Downtrend of leaf relative water content and peroxidase (POD) activity were found under drought stress in these two cultivars, but the downtrend in Z. japonica was more significant, especially at the later drought stress stages. In addition, the decreases of chlorophyll a and b were significant in Z. japonica but not in Z. tenuifolia under drought stress. Moreover, downtrend of the leaf relative electric conductivity and MDA content were also found in these two cultivars under drought stress, but the downtrend in Z. japonica was more significant. On the other hand, the Rubisco contents decreased on the 3rd day under drought stress in these two cultivars, and no significant difference in the level of Rubisco was observed in Z. japonica relative to the control at the later stages of drought stress, while the difference was significant in Z. tenuifolia. All these results showed that the increase of foliar ascorbic acid and POD activity in Zoysia under drought stress may delay the degradation of Rubisco and chlorophyll content and relieve the injury caused by oxidative stress and improve the drought-resistance. These results also confirmed that there are some drought-resistant difference between different Zoysia cultivars and the drought-resistant of Z. japonica is lower than Z. tenuifolia.