摘要： 在Na⁺Cl浓度0,3.0,.0,7.0 g/L下,对转甜菜碱醛脱氢酶(BADH)基因水稻的两个品系1-22,2-7及其受体亲本中花8号进行幼苗耐盐性试验.结果表明:转BADH基因水稻比其受体亲本耐盐性强,在高Na⁺Cl浓度(.0,7.0 g/L)胁迫下,甜菜碱醛脱氢酶基因可以提高盐胁迫下水稻幼苗过氧化氢酶(CAT)活性,提高根系活力和叶绿素含量,稳定细胞膜的透性,降低植株体内Na⁺+的积累,从而减轻幼苗受盐害的程度.盐胁迫下水稻幼苗的CAT活性、SNa⁺+/K+、叶Na⁺+/K+、叶绿素含量是影响幼苗生长的主要生理指标.

关键词: 水稻, 甜菜碱醛脱氢酶基因, 盐胁迫, 耐盐生理

Abstract: Salt stress experiments of rice seedlings of two lines with a gene encoding for BADH,51一22，52 一7 and the recipient Zhonghua No. 8，were conducted under the Na⁺CI concentration of 0，3. 0，5. 0，7. 0 g/L. The results showed that the rice cultivars with a gene encoding for BADH demonstrated higher salt tolerance than its recipient;The gene encoding for BADH could reduce the salt injury by increasing CAT activity,root ac-tivity,chlorophyll content and cell membrane osmosis,and by decreasing the Na⁺十concentration in the seedlings under high Na⁺CI stress (Na⁺CI concentration:5.0, 7. 0 g/L) ; The CAT activity, SN。十/K* and chlorophyll content are the main physiological indexes affecting the seedling growth.

Key words: Rice, Betaine aldehyde dehydrogenase, Salt stress, Salt tolerance physiology

中图分类号: 

• S511.01