中国水稻科学

中国水稻科学

• 研究报告 • 上一篇    下一篇

钙提高水稻幼苗抗旱性的研究

卢少云1;黎用朝2;郭振飞1,*;李宝盛1;李明启1   

  1. 1 华南农业大学 生物技术学院，广东 广州 510642；2 湖南省水稻研究所，湖南 长沙 410125；* 通信联系人
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1999-07-10 发布日期:1999-07-10

Enhancement of Drought Resistance of Rice Seedlings by Calcium

Lu Shaoyun; Li Yongchao; Guo Zhenfei; Li Baosheng; Li Mingqi   

  • Received:1900-01-01 Revised:1900-01-01 Online:1999-07-10 Published:1999-07-10

PDF

摘要： 将水稻种子用CaCl2溶液浸种18 h后催芽、播种，培养13 d后进行渗透胁迫处理。Ca2+浸种的水稻幼苗在-0.5 MPa的渗透胁迫下地上部相对含水量提高，质膜相对透性降低，表明提高了抗旱性。异丙嗪(CPZ)和CPZ + Ca2+浸种亦提高了水稻抗旱性。渗透胁迫1 d后，Ca2+浸种的超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性和抗坏血酸(AsA)、还原型谷胱甘肽(GSH)含量均提高。实验结果表明，Ca2+处理提高膜脂过氧化的保护能力和膜的稳定性可能是其提高水稻幼苗抗旱性的原因。

关键词: 钙, 水稻, 秧苗, 抗旱性

Abstract: Rice seeds were immersed in CaCl2 soIution or water (as control ) for 18 hours, and then germinated. The seedlings treated with Ca2+ showed higher relative water content and lower relative plasmalema permeability under osmotic stress by -0. 5 MPa, which indicated that drought resistance was increased by Ca2+ treatment. Soaking seeds with chloropromazine (CPZ, 2 mmol/L) and CPZ (2 mmol/L) + Ca2+ (20 mmol/L) also increased the drought resistance of rice seedlings. After treatment with osmotic stress for one day, superoxide dismutase (SOD) and catalase (CAT) were activated, and the contents of ascorbate (AsA) and reduced glutathione (GSH) were increased by soaking seeds with 2o0 mmol/L of Ca2+. These results indicated that Ca2+ treatment increased protection against membrane lipid peroxidation and stability of membranes and therefore resulted in the increase of drought resistance of rice seedlings.

Key words: calcium, rice, drought resistance, seedlings