论文部分内容阅读
为了探讨叶片衰老表现型,为水稻抗早衰栽培技术和抗早衰新品种选育提供依据,选用6个杂交稻组合,抽穗后常规水分管理和限水条件下,研究根系活力、叶片氮素含量、叶绿素含量、净光合速率以及保护酶SOD、POD和CAT活性动态及其对水分亏缺的响应。结果表明,不同组合的根系伤流强度、叶片氮素含量、叶绿素含量和净光合速率的衰减节律有明显差异,表现在衰减的起始时间、频率和衰减量。不同组合各生理指标对水分亏缺的响应不完全一致。叶绿素含量衰减率与根系活力和叶片氮含量衰减率极显著正相关;净光合速率与叶绿素含量极显著正相关。SOD、CAT和POD活性动态不同,不同组合对水分亏缺的响应不同。叶绿素含量、叶片N素含量的变化动态与SOD和CAT活性极显著正相关,与MDA含量极显著负相关。水稻的抗衰老特性是基因型差异及其各项生理机能对环境应答结果。
In order to explore the phenotype of leaf senescence, this study provided the basis for the cultivation of anti-premature senescence and the breeding of new varieties with early premature aging in rice. Six hybrid rice combinations were selected to study the effects of root activity, nitrogen content, Chlorophyll content, net photosynthetic rate and activities of protective enzymes SOD, POD and CAT and their responses to water deficit. The results showed that there were significant differences in the decay rhythm of root trauma intensity, leaf nitrogen content, chlorophyll content and net photosynthetic rate in different combinations, which were shown in the decay start time, frequency and attenuation. Different combinations of physiological indicators of water deficit response is not exactly the same. The decay rate of chlorophyll content had a significant positive correlation with root vigor and decay rate of leaf nitrogen content. There was a significant positive correlation between net photosynthetic rate and chlorophyll content. The activities of SOD, CAT and POD varied dynamically, and the response of different combinations to water deficit was different. The dynamic changes of chlorophyll content and N content in leaves were significantly and positively correlated with the activity of SOD and CAT, and significantly negatively correlated with the content of MDA. The anti-aging properties of rice are genotypic differences and the physiological response to environmental effects.