不同氮营养下炭疽病菌侵染对菜心叶片内源激素的影响

摘要/Abstract

摘要： 研究了6种不同氮营养水平下炭疽病菌对菜心叶片乙烯释放量、脱落酸(ABA)和吲哚乙酸(IAA)含量的影响及其与抗病性的关系.结果表明,在感病过程中,所有氮营养处理乙烯释放量呈单峰曲线变化,并在接种后的第4天至第6天达到峰值,适宜氮、低氮营养比高氮或不施肥可抑制乙烯产生和ABA的合成,维持体内乙烯、ABA的稳定.适宜氮、低氮处理感病后IAA含量一直上升,而高氮或不施肥处理的IAA呈单峰曲线变化,并在接种后4～6d达到峰值,随着致病时间的延长,适宜氮、低氮营养比高氮或不施肥可提高炭疽病菌对IAA的诱导.表明氮营养炭疽病内源激素之间存在密切的关系,维持植株体内的激素平衡是提高植株耐病的机理之一.

关键词: 菜心, 氮营养, 炭疽病, 内源激素

Abstract: This paper studied the effects of Colletotrichum higginsianum infection on the ethylene production and the contents of abscisic acid (ABA) and indole-3-acetic acid (IAA) in leaves of flowering Chinese cabbage (Brassica parachinensis) under six levels of nitrogen (N) nutrition,and their relations to disease-resistance.The results showed that the ethylene production in all N treatments had a mono-peak curve change,and reached the maximum 4～6 days after inoculation.In comparing with high N or non-N treatment,medium or low N treatment could inhibit ethylene production and ABA synthesis,and keep ethylene and ABA stable in Colletotrichum higginsianum-inoculated plants.The IAA content in medium or low N treatment increased gradually,while that in high N or non-N treatment had a mono-peak curve change,and reached the maximum 4～6 days after inoculation.The IAA content in medium or low N treatment increased more with inoculation time,indicating that there was a close relationship among N nutrition,endogenous hormones and anthracnose.It is important for plants' disease-resistance to keep the balance of endogenous hormones.

Key words: Brassica parachinensis, Clletotrichum higginsianum, Nitrogen nutrition, Endogenous hormones

中图分类号:

Q945
S634.5

杨暹, 陈晓燕. 不同氮营养下炭疽病菌侵染对菜心叶片内源激素的影响[J]. 应用生态学报, 2005, 16(5): 919-923.

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