赤霉素对稻秆抗瘟性影响的分析

AN ANALYSIS ON EFFECT OF GIBBERELLIN ON RESISTANCE OF RICE STALK TO RICE STALK BLAST

赤霉素对稻秆抗瘟性的影响主要与表皮结构和生理生化有关。稻株喷洒赤霉素后,稻秆节间伸长,表皮硅化细胞数目减少,角质层和表皮层的厚度变薄,利于稻瘟病菌的入侵;同时,稻秆体内的总糖含量和过氧化物酶活性下降,还原糖占总糖的百分含量增加,有利于入侵稻秆体内的稻瘟病菌的生长与扩展。

The result of the trial indicated that the effect of gibberellin on rice stalk resistance to rice stalk blast caused by Pyricularia oryzae Car.was related to its effect on epidermal structure of rice stalk.The number of silicificed cells and thickness of cuticle in the epidermis of rice stalk were reduced after treated with gibberellin,therefore the rice blast fungi could easily penetrate to the rice stalk.In addition,the effect of gibberellin on resistance to the disease was related to its effect on biochemistry and physiology of rice stalk.After treated with gibberellin,the content of reducing sugar in total sugar(%)increased,but the content of total sugar and activity of peroxidase decreased.It favoured the growth of rice blast fungi in the rice stalk.