低温条件下不同抗寒性薰衣草内源激素的变化

为揭示薰衣草内源激素与抗寒能力的关系,以抗寒性相对较强的狭叶薰衣草和抗寒性较弱的宽叶薰衣草为试验材料,在田间自然条件下,于越冬前不同降温时期分别对叶片和根系取样,采用酶联免疫吸附法（ELISA）测定和分析了内源激素ABA、GA3、IAA和ZR的含量变化。结果表明,两种薰衣草的叶片和根系中的ABA、IAA和ZR的含量随气温的降低均表现为先升高后降低的趋势,但GA3表现为持续下降的趋势。抗寒性强的狭叶薰衣草叶片和根系中的ABA、IAA和ZR含量均高于抗寒性弱的宽叶薰衣草,而GA3小于宽叶薰衣草。对薰衣草越冬起重要作用的内源激素是ABA。

Changes of Endogenous Hormones of Lavender Varieties with Different Cold-Resistances under Low Temperature

In order to reveal the relationship between endogenous hormones and cold-resistance, Lavandula angustifolila（cold resistant） and L. latifolia（cold susceptible） were used as experimental material under fi eld condition. The contents of endogenous ABA, GA3, IAA and ZR in leaves and roots were investigated by ELISA before overwintering at different low temperature periods. The results showed that ABA, IAA and ZR contents in leaves and roots increased at fi rst, and then decreased, but GA3 contents in leaves and roots decreased continuously. The general results also showed that the contents of ABA, ZR and IAA in leaves and roots of L. angustifolila were higher than those of L. latifolia, but the contents of GA3 in leaves and roots of L. angustifolila were lower than those of L. latifolia. ABA was the most important endogenous hormone of lavender for overwintering.