Relationships between alcohol dehydrogenase activity and flooding tolerance in corn roots under waterlogging stress
1991
Liu Xiaozhong | Wang Zongli (Jiangsu Provincial Academy of Agricultural Sciences, Nanjing (China). Inst. of Agrobiological Genetics and Physiology) | Gao Yuzhu
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 coincides 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
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