落叶松枯梢病寄主抗病机制的研究

A study on the Disease-Resistance Mechanism of the Host

对落叶松枯梢病寄主抗病机制进行系统研究发现，易感病品种．（如华北落叶松）开始抽新梢时间都提前7—15d，抗病品种（如日本落叶松）开始抽新梢时间都晚10～15d；落叶松品种K^＋、Mn^＋＋含量低、儿茶酸含量高时则抗病；证明了落叶松枯梢病的发生与新梢含水率的关系呈正相关。提出利用寄主抗病机制的研究结果鉴定抗病良种的生理生化数量指标为：（1）落叶松不同品种在同一栽植地点开始抽新梢的时间变化：（2）K^＋、Mn^＋＋及儿茶酸的含量。

This thesis studies the disease- resistance mechanism of Botryosphearia laricina host systematically , proclaims the breeding and ecological relationship between pathogenic bacteria and host. It finds out that the Sprouting time of the disease- easily- infected species （such as Larch Larix principis - rupprechtii） is 7-15 d earlier, but the disease- resistance species （such as Laria： kaernpferi） is 10-15 d later. The disease - resistance comes if the. content of K^＋ and Mn^＋＋ is low while Catechins is high. It also proves that Botryosphearia laricina is in direct proportion to moisture content. This thesis proposes that the amount quota of identifying the physiology of good diseaseresistance species by using the result of host disease - resistance mechanism are （1） different sprouting time of different Larix species growing in the same area; （2） the content of K^＋, Mn^＋＋ and Catech ins.