中国农业科学 ›› 2007, Vol. 40 ›› Issue (2): 399-404 .

• 研究简报 • 上一篇    下一篇

水稻开花期一些生理生化特性与品种抗旱性的关系

王贺正,马 均,李旭毅,李 艳,张荣萍,汪仁全   

  1. 四川农业大学水稻研究所
  • 收稿日期:2005-10-20 修回日期:1900-01-01 出版日期:2007-02-10 发布日期:2007-02-10
  • 通讯作者: 马 均

Relationship between Some Physiology Characteristics andDrought Resistance at Flowering Stage in Rice

  

  1. 四川农业大学水稻研究所
  • Received:2005-10-20 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10

摘要: 【目的】探索水稻开花期适应干旱环境的生理生化机制,筛选水稻开花期抗旱性鉴定的生理生化指标。【方法】利用抗旱性不同的10个水、旱稻品种,在干旱棚内通过开花期水分胁迫,研究了叶片抗坏血酸(Vc)、游离氨基酸、可溶性蛋白质、丙二醛(MDA)等物质的含量和保护性酶活性的变化。【结果】开花期水分胁迫增加了叶片Vc、游离氨基酸、可溶性蛋白质和MDA含量,提高了超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)的活性。相关分析表明, 在水分胁迫与对照条件下Vc、游离氨基酸、MDA含量和SOD活性的相对值与品种的抗旱系数有显著或极显著相关性。【结论】水、旱条件下Vc、游离氨基酸总量、MDA含量和SOD活性相对值可作为水稻开花期抗旱性鉴定指标,利用此4项相对值与抗旱系数所建立的回归方程可预测品种开花期的抗旱性。

关键词: 水稻, 水分胁迫, 开花期, 生理生化性状

Abstract: Rice may suffer serious water stress during its growth period. Drought affects the process of physiology metabolizability. Ten rice and upland rice varieties with different drought resistant abilities were used as experimental materials. Changes in ascorbic acid (Vc)content, free amino acid content, soluble protein content ,malondialdehyde (MDA)content and antioxidative enzyme activities were studied under both irrigation and drought conditions at flowering stage. The results were as follows: water stress increased Vc content, free amino acid content, soluble protein content and malondialdehyde (MDA)content, and increased superoxide dismutase(SOD), catalase (CAT) and peroxidase (POD) activities in leaves at flowering stage. Correlation analysis showed that drought-resistant coefficient significantly correlated or very significantly correlated with relative value of Vc content, free amino acid content, MDA content and SOD activity under both irrigation and drought conditions, therefore, relative value of thesecould be selected to using the identification indexes of drought resistance at flowering stage. Using stepwise regression equation to evaluate the drought resistance of rice cultivars was more scientifically and reliably.