棉株感染枯萎病后的几种生理变化及其与抗病性的关系

THE RELATIONSHIP OF SOME PHYSIOLOGICAL CHANGES AND DISEASE RESISTANCE IN COTTON INFECTED WITH FUSARIUM WILT DISEASE

测定了不同抗病性品种棉苗受枯萎病菌毒素处理后的致萎程度和有关的生理代谢变化。结果表明:致萎程度低的冀合3016,各生理生化指标比较稳定;而致萎程度高的鲁棉6号和邯郸14则变化明显。表现在呼吸强度升高,过氧化物酶,纤维素酶和果胶酶活性增强,并出现了新的过氧化物酶同工酶谱带。在大田中表现出一定抗病性的中棉12,某些指标却与非抗病性的品种一致。

The degree of caused wilting, respiratory rate, peroxidase activity and peroxidase isozyme in different disease resistance variety seedlings treated with crude extract of fusarium wilt pathogen were estimated, and the cellulase and pectinase activities in roots of some variety seedlings infected directly by pathogen were also measured. The results showed that in low degree of caused wilting Jihe 3016 treated with toxin, the changes of various physiological-chemical indices were rather small and appeared relatively stable while in those with high degree caused wilting Zhongmian 12, Lumian 6 and Handan 14, the respiratory rate and activities of peroxidase, cellulase and pectinase were all evidently enhanced, and new peroxidase isozymes were appeared. The explant test results of Zhongmian 12 which shows disease-resistant in fields were coincident with that of Lumian 6 and Handan 14, but its cellulase and pectinase activities were similar to that of Jihe 3016.