近年来,在广西隆安县蔗区出现疑似感染白条病的甘蔗植株.对该地区的田间可疑植株的病状进行观察并采集样本进行病原菌分离和鉴定,再通过柯赫氏法则回接验证病原菌的致病性.结果表明,隆安县蔗区遭受白条病菌侵染为害,人工接种条件下,健康甘蔗植株出现白条病典型病症.文章为今后深入研究甘蔗白条病病原菌及其与甘蔗互作奠定了基础.

Objective The present study was conducted to study the changes of endogenous hormone contents in two sugarcane varieties with different disease resistance after smut infection in order to provide references for illustrating the mechanism of sugarcane smut resistance and breeding smut resistant sugarcane varieties.Method In the experiment,changes of endogenous hormone content in sugarcane varieties GT28 and ROC22 were studied after the smut spore inoculation with sterilized water inoculation were used as control.Result After inoculation with smut pathogen,the contents of endogenous hormones in the seedling leaves changed.The IAA and GA contents decreased,while the ABA,SA,and JA contents increased,and the IAA/ABA ratio decreased after smut infection compared to that of the controls.Compared with the susceptible variety ROC22,the IAA and ABA contents were lower and the GA and SA contents were higher in the resistant variety GT28;the IAA/ABA ratio decreased relatively more in ROC22 than in GT28,and the JA content had no significant differences between the two sugarcane varieties.Conclusion The changes of IAA,GA,ABA,and SA contents and the IAA/ABA ratio in the seedling leaves were closely related to the smut resistance of different sugarcane varieties,therefore they could be used as indexes for sugarcane smut resistance.