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以南农99-6为材料,通过盆栽试验研究了淹水胁迫(水面淹至大豆子叶节部位)对大豆生长与产量的影响。结果表明:淹水抑制了大豆的生长,随淹水时间延长大豆的主、侧根逐渐腐烂,茎淹水部分产生大量不定根,为大豆适应淹水环境提供条件。在淹水处理0~10 d内,植株的生物量、叶面积、光合参数较对照有一定增加,但10 d以后随时间延长呈下降趋势;叶片中的色素含量降低,随时间延长与对照差异显著;叶片丙二醛、过氧化氢含量随胁迫时间延长呈上升趋势,显著高于对照。淹水胁迫最终导致单株荚数和产量明显降低,淹水时间越长,降低幅度越大。综合各指标来看,光合参数、丙二醛和过氧化氢含量等生理指标在0~10 d与对照差异不显著,而10 d后差异显著,可以推断该大豆品种的淹水胁迫临界期为10 d。
Taking Nannong99-6 as material, the effects of flooding stress (flooding on soybean cotyledon node) on the growth and yield of soybean were studied by pot experiment. The results showed that flooding inhibited the growth of soybean. With the extension of flooding time, the main and lateral roots of soybean gradually decayed, and a large number of adventitious roots were formed in the flooded stem, which provided conditions for the soybean to adapt to the flooding environment. The biomass, leaf area and photosynthetic parameters of the plants increased from 0 to 10 days after flooding, but decreased with the prolongation of time after 10 days. The contents of pigment in the leaves decreased with the increase of time Significantly, the contents of malondialdehyde and hydrogen peroxide increased with the prolongation of stress time, which were significantly higher than those of the control. Under flooding stress, the number of pods per plant and yield decreased obviously. The longer the flooding time, the greater the decrease. According to the indexes, the physiological indexes such as photosynthetic parameters, malondialdehyde and hydrogen peroxide were not significantly different from the control at 0 ~ 10 d, but significant difference after 10 d, it could be inferred that the critical period of flood stress of the soybean varieties was 10 d.