| Abstrakt: |
In order to investigate the effects of soil water stress on morphology and physiological characteristics of soybean, three different drought - resistant soybean varieties ( Hefeng25, Heinong44 and Jindou21 ) were selected for pot experiment. Moderate and severe soil water stress were applied from beginning of pod formation to seed filling stage. Morphological characteristics, chlorophyll content, photosynthetic rate, SOD activity, POD activity, CAT activity were examined. The results of drought resistance of tested cuhivars were shown as : Jindou21 > Heinong44 > Hefeng25. Jindoti21 of the most resistant rootstocks demonstrated the powerful growth advantage under soil water stress. Many indices of Jindou21 were higher than Heinong44 and Hefeng25, including plant height, pods number per plant, grain number per plant, grain weight per plant, chlorophyll content, Pn ( photosynthetic rate) and POD activity. But GS (stomatal conductance) and Tr (transpiration rate) of Jindou21 were higher than Heinong44 and Hefeng25, their decrease were significantly higher than Heinong44 and Hefeng25 under severe soil water stress. Jindou21 had higher water use efficiency. These morphological characteristics and physiological index could be used to evaluate drought resistance of soybean. [ABSTRACT FROM AUTHOR] |
