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为深入研究外源6-BA(6-苄氨基腺嘌呤)对江汉平原冬小麦孕穗期渍害的调控效应,以江汉平原主栽品种郑麦9023为试验材料,在孕穗期设置渍水、喷6-BA+渍水2种处理,并以不渍水不喷6-BA处理为对照(CK),研究在小麦孕穗期遭遇渍害时外源6-BA对小麦生理生化指标的调控效应以及对子粒产量的影响。结果表明,孕穗期渍水显著降低旗叶净光合速率、干物质积累量及穗粒数,对子粒产量也造成显著影响;渍害还会加速植株衰老,增加旗叶和倒三叶中丙二醛(MDA)含量。渍水前喷施外源6-BA有助于孕穗期渍水后旗叶净光合速率和干物质积累量的恢复,且显著降低旗叶和倒三叶MDA含量,对穗粒数和产量也有很好的恢复效果。总之,孕穗期遭遇渍害会改变整个植株生理生化代谢,喷施6-BA有助于增强小麦的抗渍性及协调产量构成因素间的关系,从而达到产量恢复的效果。
In order to further study the regulatory effect of exogenous 6-BA (6-benzyladenine adenine) on waterlogging during the booting stage of winter wheat in the Jianghan Plain, Zhengmai 9023, a major plant in the Jianghan Plain, was used as test material. -BA + waterlogging, CK and CK-6 were treated with non-waterlogged and non-waterlogged 6-BA to study the regulation effects of exogenous 6-BA on physiological and biochemical indexes of wheat at the booting stage of wheat, The impact of production. The results showed that waterlogging at booting stage significantly reduced the net photosynthetic rate of flag leaves, dry matter accumulation and grains per spike, which also had a significant effect on grain yield; Aldehyde (MDA) content. Spraying exogenous 6-BA before waterlogging is helpful to the recovery of net photosynthetic rate and dry matter accumulation of flag leaves after booting stage waterlogging, and significantly reduces MDA content of flag leaf and upturned leaf, Very good recovery effect. In short, booting encounter bark will change the physiological and biochemical metabolism of the entire plant, spraying 6-BA helps to enhance the resistance of wheat and coordinate the relationship between yield components, so as to achieve the effect of yield recovery.