树皮结构与山核桃溃疡病抗性关系的研究

对树皮结构与山核桃溃疡病之间关系的研究表明，随着树龄的增大，周皮呈现出较厚的胞壁特征，病害较轻或不发病，感病指数与周皮厚度存在一定的负相关，其中，木栓层的厚度对植株抗病性的影响最大，木栓形成层区的宽度与感病指数之间呈一定的正相关，栓内层与之呈微弱的负相关。皮层的机械性能在一定程度上影响着树皮对溃疡病抗性。韧皮纤维比量在30％～50％之间，与感病指数则呈较强的负相关。次生韧皮部里的含晶纤维束占韧皮纤维总量的50％～55％，不同龄级之间差异不明显，与抗病性的相关性不明显。筛管活动能力与病害程度之间有着较强的负相关性，随着病害程度的加重，直径逐渐减小。韧皮射线组织比量与感病指数之间也呈负相关。

Relationship between Bark Structure and Anti-canker of Hickory

The research of relationship between bark structure and anti-canker of hickory showed that the index of infection is negative to the thickness of periderm, but is positive to the width of phellem cambium. The mechanism character of cortex affected the anti-disease of plant.