干旱胁迫及复水对豌豆根系内源激素含量的影响

采用盆栽试验方法,研究了干旱胁迫及复水对豌豆根系脱落酸(ABA)、吲哚乙酸(IAA)、赤霉素(GA)和玉米素(ZT)等4种内源激素含量的影响.结果表明:不同程度的干旱胁迫均导致各生育期豌豆根系ABA和IAA含量增加,GA和ZT含量减少,且随干旱胁迫程度的加重变化量增大.同时对各生育期豌豆根系内源激素比例产生影响,对ZT与ABA、GA与ABA、GA与IAA、ZT与IAA比例影响较大,对ZT与GA、IAA与ABA比例影响较小.旱后复水可对各生育期豌豆根系内源激素含量产生补偿效应,其补偿量决定于豌豆生育时期、干旱胁迫强度和复水历时.同时促进各生育期豌豆根系内源激素比例发生变化.

Effect of drought stress and water recovery on endogenous hormone content in roots of pea

Pot experiment was conducted to determine the content of endogenous hormone, including Abscisic acid (ABA), Indole-3-acetic acid (IAA), Gibberellins (GA) and Zeatin (ZT), in the roots of pea (Pisum sativum Linn.) under drought stress and water recovery. The results indicate that different degrees of drought stress increase ABA and IAA contents while decreasing the contents of GA and ZT. With severe drought stress, the effects generally tend to increase. Different degrees of drought stress leads to different proportions of endogenous hormones in the roots at different growth stages. Drought has considerable impact on ZT/ABA, GA/ABA, GA/IAA and ZT/IAA ratios. But drought effect on ZT/GA, IAA/ABA ratios is insignificant. There is compensation effect of water recovery after drought stress on the 4 endogenous hormones at every growth stage which varies with growth stage, drought stress intensity and water recovery rate. Water recovery leads to variations in endogenous hormones ratio.