摘要
土壤涝渍时两个玉米自交系苏80-1(耐涝)和黄早四(不耐涝)根系质膜透性、乙醇脱氢酶(ADH)活性和乙醇发酵产物含量均有不同程度的增加,其增幅与品种耐涝性呈相反的关系。淹水下玉米根ADH对乙醛的亲和力增加,对乙醇的亲和力下降,其增减幅度均与品种耐涝性相反。外源底物乙醛和乙醇对玉米根系ADH的诱导作用与品种对涝渍的敏感度一致。结果表明,受涝玉米根系乙醇发酵的增强,既表现出短期的适应,也是根系伤害的原因之一,玉米品种耐涝性与其低速率的乙醇发酵有关。
Two inbred lines of maize,Su 80-1 with flooding tolerance and Huangzaosi with flooding intolerance, were investigated focusing on changes in alcohol fermentation and its relation to flooding tolerance under waterlogging stress. The results showed that the plasmalemma permeability in root cells, the activity of alcohol dehydrogenase (ADH)and the content of alcohol fermentation products in roots were increased as waterlogging prolonged. The increases in the flooding tolerant variety were lower than those in the flooding intolerant variety. Furthermore, the apparent Km value of ADH was decreased for acetaldehyde but increased for ethanol, which meant that the affinity of ADH was increased for acetaldehyde but decreased for ethanol. The change extent of affinity of ADH was negatively correlated to the flooding tolerance of varieties. Meanwhile, the capability of exogenous acetaldehyde and
ethanol to induce ADH activity coincided with the flooding sensitivity of varieties. These results indicated that enhanced ethanol fermentation was a temporary adaptation as well as one of the major causes of root injuries under waterlogging stress. Therefore,the flooding tolerance of a variety was relevant to lower ethanol fermentation during waterlogging.
出处
《江苏农业学报》
CSCD
1991年第4期1-7,共7页
Jiangsu Journal of Agricultural Sciences
基金
试验得到农业部05-01-02
国家自然科学基金3860644项目资助
关键词
玉米
耐涝性
乙醇脱氢酶
乙醇
发酵
Corn
Flooding tolerance
Alcohol dehydrogenase
Alcohol fermentation
Root plasmalemma permeability
