玉米对丝黑穗病菌抗性影响因子研究

在进行抗病性鉴定的基础上，测定了抗、感病品种胚芽和胚根内的N、P、K、可溶性糖和维生素C的含量以及不同时期玉米生长点内防御酶活性的变化。结果表明：玉米对丝黑穗病菌的抗性与胚根和胚芽内的N、P、K含量呈正相关，与Vc和可溶性糖含量呈负相关。当病菌侵入后抗病品种苯丙氨酸解氨酶(PAL)和过氧化物酶(POD)活性上升幅度高于感病品种，而多酚氧化酶(PPO)、酯酶(EST)和超氧化物歧化酶(SOD)在感病品种中上升幅度高。土壤施用氮肥和钾肥能明显提高玉米对丝黑穗病菌的抗性，磷肥效果不明显。

Study on Influence Factors of Maize Resistance to Sporisorium reiliana

The content of N, P, K, vitamin C and soluble sugar in radicle and embryo as well as defense enzyme activity in maize growing point at different stages were studied based on disease-resistant identification in this paper. The result showed that there was positive correlation between resistance to Sporisorium reiliana and the content of N, P, K. Otherwise negative correlation with the content of soluble sugar and Vc. And PAL and POD activity in the resistant variety increased by more than susceptible one, but PPO, EST and SOD activity were less than susceptible one. At the same time, the study showed maize resistance to Sporisorium reilianum strengthened obviously when N and K fertilizer were exerted in the soil, whereas P effect was not obvious.