论文部分内容阅读
为了解和掌握高粱对水分胁迫的生理响应及对产量性状的影响,笔者运用二因素四水平的随机区组设计法进行了桶栽试验的研究。结果表明:轻度水分胁迫增强了高粱的超氧化物歧化酶(SOD)、过氧化物酶(POD)的活性,提高了游离脯氨酸(Pro)和丙二醛(MDA)的含量,中、重度的水分胁迫则降低了SOD和POD的活性,却增加了Pro和MDA的含量;苗期胁迫后复水,中、长历时的中度胁迫和短历时的重度胁迫的产量性状明显高于对照,差异达5%的显著性;拔节期胁迫后复水,中、长历时胁迫的生理指标没有恢复到初始状态,且产量随胁迫的加重降幅明显,达到了显著或极显著的水平。由此看出:轻度水分胁迫可提高高粱抗氧化酶活性,而中、重度胁迫则降低其活性,苗期胁迫后复水,有利于产量的提高,拔节期胁迫后复水,则负效应大于正效应。
In order to understand and grasp the physiological response of sorghum to water stress and the impact on yield traits, the author used the two factors and four levels of randomized block design method to conduct the barreled test research. The results showed that mild water stress increased the activities of superoxide dismutase (SOD) and peroxidase (POD), and increased the levels of free proline (Pro) and malondialdehyde (MDA) , Severe water stress reduced the activity of SOD and POD, but increased the content of Pro and MDA. The seed yield increased after rewatering, medium and long-term moderate stress and short-duration severe stress The difference was up to 5%. The physiological indexes of the medium and long-term stress after rewatering at jointing stage did not return to the initial state, and the yield decreased significantly with the aggravation of stress, reaching significant or extremely significant level. It can be seen that mild water stress can increase sorghum antioxidant enzyme activity, while medium and severe stress reduce its activity, rewatering after seedling stress is conducive to increase yield, jointing stress after rehydration, the negative effect Greater than the positive effect.