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本试验以东农425和东农427为试验材料,在水稻全生育期内以土壤水势为灌水衡量指标,研究了五种不同灌溉方式对寒地粳稻抗旱生理性状的影响,结果表明:在整个生育期内,处理的叶片脯氨酸(Pro)、丙二醛(MDA)积累量、变化幅度基本趋势为:旱作>重干湿交替灌溉>轻干湿交替灌溉>中干湿交替灌溉>常规灌溉,重干湿交替灌溉和旱作处理显著增加了叶片脯氨酸、丙二醛含量。叶片脯氨酸、丙二醛含量与植株抗旱性及产量均呈负相关关系,其中脯氨酸含量相关性显著;重干湿交替灌溉和旱作处理的叶绿素(Chl)含量明显低于常规灌溉及轻干湿交替灌溉、中干湿交替灌溉处理,随着生育进程的推进,轻干湿交替灌溉、中干湿交替灌溉处理的叶片叶绿素含量反而高于其他处理。中干湿交替灌溉处理能够显著增加水稻叶片叶绿素含量,叶片叶绿素含量与植株抗旱性及产量呈显著正相关。中干湿交替灌溉处理是较为合理的灌溉方式,即田间土壤水势灌溉下限不应低于-20kPa。通过对植物抗旱性及抗旱相关生理指标的分析得出东农425的抗旱性较东农427强。
In this experiment, Dongnong 425 and Dongnong 427 were used as experimental materials. Soil water potential was used as a measure of irrigation water during the whole growth period of rice. The effects of five different irrigation methods on drought resistance physiological characteristics in cold region were studied. The results showed that: During the growth period, the basic trends of accumulation of Pro and MDA in the leaves were: dry farming> alternating wetting and dry> alternating wetting and light> alternating wetting and dryting> Conventional irrigation, alternating wet-dry irrigation and dry farming significantly increased the contents of proline and malondialdehyde in leaves. The contents of proline and malondialdehyde in leaves were negatively correlated with the drought resistance and the yield of the plants, and the content of proline in the leaves was significantly correlated. The contents of chlorophyll (Chl) in alternate dry and wet plots were significantly lower than those in conventional irrigation Alternate light and wet alternation and alternate wet and dry alternation irrigation. With the progress of fertility, alternating light and wet alternation, the chlorophyll content of alternate dry and wet alternate irrigation was higher than other treatments. Alternate irrigation in wet and dry conditions could significantly increase the content of chlorophyll in rice leaves. There was a significant positive correlation between leaf chlorophyll content and plant drought resistance and yield. Alternating wet and dry irrigation is a more reasonable irrigation method, that is, the minimum soil water potential irrigation field should not be less than -20kPa. Through the analysis of plant drought resistance and drought-related physiological indicators, Dongnong 425 has stronger drought resistance than Dongnong 427.