不同时期水分胁迫对御旱基因型大豆生理特性和产量的影响OA北大核心CSTPCD

In order to explore the response mechanism of drought-avoidant soybean genotypes to drought stress,the drought-avoidant soybean Liaodou 14 and drought-sensitive soybean Liaodou 21 were used as experimental materials,the change law of different growth stages and different drought resistance varieties was analyzed.The effects of water stress on plant height,leaf area index,chlorophyll content,organ biomass,organ water content,root-shoot ratio,yield and related traits were analyzed in two consecutive years.The results showed that,with the advancement of the growth process,the plant height,leaf area index and biomass of each organ gradually accumulated under the condition of water control treatment,and the overall performance was:pod filling stage>podding stage>flowering stage>vegetative stage.In general,under soil drought stress condition,the chlorophyll content,leaf area index,plant height and water content of each organ of the plant decreased,but the root to shoot ratio of the plant increased when soil water was controlled at each period.In addition,the chlorophyll SPAD value generally showed as follows:Liaodou 21>Liaodou 14.While the water content of each organ was as follows:Liaodou 14>Liaodou 21 under the same water condition.In 2021,when soil water was controlled at podding stage and pod filling stage,the effects of varieties on leaf area index and plant height were as follows:Liaodou 14>Liaodou 21.Moreover,soil water content increased the dry weight of root,stem,leaf,petiole and pod at the same water control period.The dry weight of petiole of Liaodou 14 was significantly higher than that of Liaodou 21 when water was controlled in podding stage and pod filling stage in 2020.Generally,soil water content increased pods number per plant,seeds number per plant and yield per plant for both varieties.Besides,pods number per plant,seeds number per plant,100-seed weight and yield per plant were generally significantly affected by varieties during water control at the same stage.Furthermore,pods number per plant,seeds number per plant and yield per plant showed as follows:Liaodou 14>Liaodou 21,while the 100-seed weight showed as follows:Liaodou 21>Liaodou 14.Therefore,the results could clarify the physiological advantages of drought-tolerant soybean in response to drought stress and further enriched the theoretical knowledge of soybean stress resistant cultivation.