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为了明确干旱胁迫对不同抗旱大豆品种生理特性及植株生长参数的影响,选取了抗旱(RD)和不抗旱(SD)品种为材料,利用盆栽方法,分析大豆营养生长期在水分胁迫下对不同品种大豆生理生化指标及生长参数的影响。结果显示,在正常浇水条件下,RD和SD品种植株叶片中与抗旱相关的生理生化指标差异不明显,而在水分胁迫15 d后,RD植株叶片中SOD和POD活性分别为SD植株叶片的1.34~1.45倍和1.46~1.69倍,SD植株叶片中的过氧化氢(H2O2)和丙二醛(MDA)为RD植株叶片中的1.80~2.35倍1.09~1.46倍。另外,在干旱胁迫条件下,发现RD地上部和根部生物量均明显高SD品种,且其根系形态参数明显优于SD品种。实验结果表明在干旱胁迫条件下,抗旱品种植株通过调节体内生理变化和优化根系形态参数来响应外界环境,从而保证在干旱条件下植株能正常生长,提高干旱胁迫的响应能力。
In order to clarify the effect of drought stress on physiological characteristics and plant growth parameters of different drought-tolerant soybean cultivars, drought-resistant (RD) and non-drought-tolerant (SD) cultivars were selected as materials and potted methods were used to analyze the effects of drought stress on seedling growth, Effects of Soybean Physiological and Biochemical Indexes and Growth Parameters. The results showed that the physiological and biochemical indexes related to drought resistance in leaves of RD and SD varieties were not obvious under normal watering conditions. However, the SOD and POD activities of RD plants were 15 days after water stress 1.34 ~ 1.45 times and 1.46 ~ 1.69 times. The H2O2 and malondialdehyde (MDA) contents in leaves of SD plants were 1.80 ~ 2.35 times 1.09 ~ 1.46 times higher than those in RD plants. In addition, under drought stress, it was found that the aboveground and root biomass of RD were significantly higher than that of SD, and the morphological parameters of their roots were significantly better than that of SD. The results showed that under drought stress, drought-tolerant plants responded to the external environment by regulating physiological changes in vivo and optimizing morphological parameters of roots to ensure that plants could grow normally under drought conditions and improve the response ability of drought stress.