水分胁迫对黄秋葵生理以及光合特性的影响

摘要

设置4个水分胁迫处理(每3d一次浇水,每7d一次浇水,每15 d一次浇水和每30 d一次浇水),通过测定黄秋葵幼苗期、花期和收获期农艺性状,产量和产量构成因素、生理生化反应以及光合特性等指标,研究水分胁迫对黄秋葵生长、生理以及光合作用的影响.结果表明,随着水分胁迫程度的增加,各生育期黄秋葵农艺性状、籽粒产量以及产量构成因素均显著降低,重度缺水导致黄秋葵绝收;黄秋葵叶片的净光合速率、气孔导度均随着水分胁迫强度的增加而减少,叶片叶绿素含量随着水分胁迫程度增强,呈现先增加后降低的趋势;黄秋葵的可溶性糖、可溶性蛋白、游离脯氨酸、丙二醛含量均随着水分胁迫强度的增加而增加.%We conducted a study of the effect of water stress on gowth,physiological metabolism and photosynthesis in okra.Four different water stress treatments (watering once per 30d,watering once per 15d,watering once per 7 d,watering once per 3 d) were investigated based on pot experiments.The agronomic traits of plants in okra during seeding stage,flowering stage and harvesting time,grain yield and its components,physiological and biochemical indexes and photosynthetic traits of okra were determined in this study.The results showed that with the enhancement of drought stress intensity,the agronomic traits,grain yield and its components of okra in each growth stage were reduced.Even the plant was failed by severe dehydration.Furthermore,the stomatal conductance and net photosynthesis rate were reduced with the increasing of the intensity of water stress.The chlorophyll content in blade increased first and then decreased.Soluble protein,proline,soluble sugar and malondialdehyde content of okra were also decreased with the increasing of the intensity of water stress.