大豆对渍水的生理响应Ⅰ：光合特性和糖代谢

以大豆品种南农99-6为材料,研究了渍水对大豆生长的影响及大豆对渍水的适应性。结果表明：长期渍水抑制了大豆的生长,植株的生物量、叶面积、叶片中的色素含量、净光合速率等均显著低于对照,H2O2含量一直高于对照。但苗期短期渍水在一定程度上刺激了大豆的生长,生物量、气孔导度、蒸腾速率均有所上升。大豆通过增大茎粗,提高叶片中蔗糖、可溶性糖含量,提高可溶性糖/可溶性蛋白的比值,从而使其在形态上、生理上产生适应性变化来适应渍水环境。

Physiological response of soybean to waterlogging I. Photosynthetic characteristics and sugar metabolism

Soybean cuhivar Nannong 99 -6 was used to study the effects of waterlogging stress on growth and adaptive response to waterlogging in pot experiments. Results showed that long - term of waterlogging inhibited soy- bean growth. Under waterlogging, biomass, leaf area, chlorophyll content, photosynthesis rate （Pn） and other pho- tosynthesis parameters were significantly lower than control. Hydrogen peroxide （H2O2 ） content was higher than control. Short -term waterlogging at seedling stage showed some positive effects on soybean growth. Biomass, stoma conductance （Gs） and transpiration rate （Tr） increased to various levels. Under waterlogging stress, the stem diameter of soybean was enlarged. Sucrose content, soluble sugar content and the ratio of soluble sugar to soluble protein were increased. The results suggested that soybean had adapted both morphologically and physiologically to waterlogging stress.