摘要
在缓慢土壤水分胁迫-复水的变水处理条件下,小麦幼苗地上部分相对含水量在80％～70％时,甜菜碱含量及甜菜碱醛脱氢酶活性最高,相对含水量大于80％或小于70％,甜菜碱的含量和甜菜碱醛脱氢酶活性都降低,并且两者变化是“同步”的。水分胁迫时,小麦幼苗迅速积累甜菜碱,抗旱型小麦增加6～8倍,水分敏感型增加4倍。积累甜菜碱与小麦抗旱性密切相关,积累的甜菜碱在维持细胞质与其内（液泡）外环境的渗透平衡中起主要作用。小麦幼苗中甜菜碱的最大含量比脯氨酸和可溶性糖最大含量出现得早;甜菜碱含量高、最大含量出现较晚的小麦基因型,幼苗抗旱性较强。
Under the changed watering condition of progressive soil water stress-rewater, the betaine content and the betaine aldehyde dehydrogenase (BADH) activity were the highest while the tissue relative water content (RWC) of winter wheat seedling was in the range of 80 % to 70%. The betaine content and the BADH activity reduced when the seedling RWC was higher than 80% or lower than 70%. And the change of both was synchronous. Under the water stress winter wheat seedlings rapidly accumulated betaine. Betaine content of genotypes with drought resistance increased sixfold to eightfold, while susceptible genotypes fourfold. Accumulated betaine correlated to drought resistance, and play a main role in maintenance of osmotic balance of cytoplasm with cellular internal (vecuole) and external environment. The time that maximum betaine content appeared was earlier than proline and soluble sugar do during water stress. Genotypes that betaine content were higher and the maximum betaine content appeared later were drought resistance.
出处
《作物学报》
CAS
CSCD
北大核心
1999年第4期494-498,共5页
Acta Agronomica Sinica
基金
国家攀登计划项目 9219-5-3
关键词
小麦
水分胁迫
甜菜碱
抗旱性
Winter wheat
Water stress
Betaine
Drought resistance
