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Gas exchange and morpho-physiological response of soybean to straw mulching under drought conditions

机译：干旱条件下大豆对秸秆覆盖的气体交换和形态生理响应

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A pot experiment was conducted to investigate the morphological, physiological and biochemical straw mulch-induced response of soybean under water-deficit conditions. Soybean (Glycine max?L. Merrill) variety “Xidou 7” was treated with varying quantity of wheat straw mulch viz: (control (no straw mulch), 3750, 7500, 11000 and 14750 kg/ha) under water-deficit conditions. The experimental results indicate that the varying quantity of straw mulch significantly improved the plant growth in terms of plant height, leaf area, number of leaves/plant and stem diameter. Mulch treatment also significantly enhanced the photosynthesis (PN), intercellular CO2?concentration (Ci), transpiration rate (E) and stomatal conductance (gs) over the control. The gas exchange parameters were improved depending on the quantity of wheat straw mulch; significantly highPN?and E was observed in the treatment where wheat straw was applied at the rate of 11000 kg/ha. Wheat straw mulch treatments led to noticeable reduction in malondialdehyde (MDA) contents, which protected the drought stressed soybean plants from membrane damage. Furthermore, the free proline contents linearly increased with increase in straw mulch quantity. It is evident that wheat straw mulch can considerably modulate growth, photosynthetic and physio-biochemical attributes of soybean under drought. The research will effectively solve seasonal drought problem and can provide technical assistance for sustainable agriculture development.
机译：进行盆栽试验，研究缺水条件下大豆秸秆覆盖的形态，生理和生化反应。在缺水条件下，用不同数量的麦草覆盖物处理大豆（Glycine max？L。Merrill）品种“ Xidou 7”，即：（对照（无麦草覆盖），3750、7500、11000和14750 kg / ha）。实验结果表明，秸秆覆盖量的变化在植物高度，叶面积，叶数/植物数和茎直径方面均显着改善了植物的生长。与对照相比，覆盖处理还显着提高了光合作用（PN），细胞间CO2浓度（Ci），蒸腾速率（E）和气孔导度（gs）。取决于麦草覆盖物的量，改进了气体交换参数。在以11000 kg / ha的比例施用小麦秸秆的处理中观察到明显较高的PN和E。小麦秸秆覆盖处理可显着降低丙二醛（MDA）含量，从而保护干旱胁迫的大豆植株免受膜损伤。此外，游离脯氨酸含量随秸秆覆盖量的增加而线性增加。显然，干旱条件下麦草覆盖物可以显着调节大豆的生长，光合和生理生化特性。该研究将有效解决季节性干旱问题，并为农业可持续发展提供技术援助。

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