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不同氮营养下炭疽病菌侵染对菜心叶片内源激素的影响

杨暹1;陈晓燕2   

  1. 1华南农业大学园艺学院,广州 510642;2广东省珠海市拱北海关,珠海 519020

  • 收稿日期:2004-01-15 修回日期:2004-11-14 出版日期:2005-05-18

Effects of Colletotrichum higginsianum infection on endogenous hormones in Brassica parachinensis leaves under different nitrogen nutrition

YANG Xian1,CHEN Xiaoyan2   

  1. 1College of Horticulture,South China Agricultural University, 510642,China;2Gongbei Customs of Zhuhai City,Zhuhai 519020,China

  • Received:2004-01-15 Revised:2004-11-14 Online:2005-05-18

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4~6 d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: 森林土壤, 多酚, 生态调节, 次生代谢物

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: Forest soil, Polyphenols, Ecological regulation, Secondary mestabolite