不同夜间温度条件下外源水杨酸对大豆产量的调控作用
- Title:
- Effects of Exogenous Salicylic Acid on Yield of Soybean Under Different Night Temperatures
- 摘要:
- 在全球气候变暖的背景下，夜间高温成为大豆高产的不利因素之一。水杨酸（Salicylic Acid, SA）是一种重要的植物激素，外源喷施SA可提升植物应对高温干旱等逆境的能力。为探究夜间高温危害的应对措施，选用2种生育期相近的大豆品种中黄39和中黄76，设置3个夜间温度（T1：18 ℃；T2：23 ℃；T3：28 ℃），每个夜间温度下设置3个SA浓度处理（SA0：CK；SA1：0.1 mmol·L-1 SA；SA2：0.5 mmol·L-1 SA）。探讨外源SA对鼓粒期夜间温度升高环境下大豆产量的调控作用。结果表明：与T1+CK处理相比，夜间温度升高，大豆单株荚数、单株粒数、地上部干物质、产量和收获指数均下降，中黄39和中黄76产量分别降低6.34%~27.13%和14.99%~45.66%。夜间温度升高，喷施SA可显著提高大豆净光合速率、地上部干物质、单株荚数和粒数，降低呼吸强度，使产量和收获指数显著提升，中黄39和中黄76表现一致。其中，28 ℃夜间温度条件下，喷施SA处理大豆产量增幅达45.69%~48.55%。研究结果表明，外施SA可以在一定程度上缓解夜间高温造成的大豆产量损失，提高收获指数。
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