Resistance of rice varieties to the stripe stem borer Chilo suppressalis
Author of the article:QIN Wen-Jing** HUANG Shui-Jin HUANG Jian-Hua CHEN Hong-FanCHEN Qiong QIN Hou-Guo***
Author's Workplace：Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
Key Words：rice varieties, Chilo suppressalis, resistance identification
Abstract： The resistance levels and underlying mechanisms by which rice varieties resist attack by the stripe stem borer were investigated to provide the basis for rational utilization of rice varieties. [Methods] The resistance levels of rice varieties to Chilo suppressalis were evaluated following both artificial inoculation and natural infection with this pest. The resistance mechanism of resistant rice varieties to C. suppressalis were studied by surveying the external morphological characteristics of rice plants, egg numbers and larval survival rates of C. suppressalis. [Results] 2 resistant rice varieties and 65 moderately resistant rice varieties were selected from 344 rice varieties. Similarity of resistance of the above 67 rice varieties to C. suppressalis in the field and laboratory was 88.06%. Compared with susceptible rice varieties, the leaf ligule, auricle and leaf sheath of resistant rice varieties (Beitiandao and Yingjianzanuo) clung more tightly to the rice stem, the distance between leaf veins was narrower, and egg numbers and survival rates of C. suppressalis on resistant rice plant were lower. [Conclusion] Resistant and moderately resistant rice varieties were selected from indica type rice, japonica rice and glutinous rice. A relatively high proportion of resistant and moderately resistant rice varieties were glutinous rice varieties (33.3%), moderately resistant rice varieties accounted for 20% of japonica rice and 18.83% of indica type rice. The anti-insect mechanism of rice varieties included morphological features of rice plants that protect against the boring activity of C. suppressalis. Eggs numbers and larval survival rates of C. suppressalis on resistant rice plants were lower than on susceptible varieties.