辽宁水稻品种抗灰飞虱鉴定及其抗性机制研究

为探明辽宁地区水稻品种对本地灰飞虱Laodelphax striatellus(Fallén)的抗性水平及其抗虫机制,本研究利用改进的苗期集团鉴定法,以IR36为抗虫对照品种、武育粳3号为感虫对照品种,对42份辽宁地区主栽水稻品种和研究待推广品种进行了水稻苗期对灰飞虱抗性鉴定,并从中选取20份不同抗性水平的品种进行了排趋性和抗生性的测定。结果表明:从42份水稻材料中仅筛选出1份抗虫材料辽优5218,中抗品种11份,其余均为感虫或高感品种。在不同水稻类型中,杂交稻的抗虫性普遍较常规稻强,而从水稻株型上看,抗性品种大多为披散型。抗虫机制研究发现,抗虫品种辽优5218和中抗品种港育129兼具排趋性和抗生性,是非常理想的抗性种质资源,中抗品种港源8号和粳优558具有很强的排趋性,也是较为理想的抗性资源,为抗性机制的深入研究提供了材料。但大部分省内主栽主推品种不具备对灰飞虱的抗性,应引起重视。

Identification of rice varieties resistant to the small brown planthopper （Laodelphax striatellus） in Liaoning and an investigation of their resistance mechanisms

Resistance levels and mechanisms of rice varieties in Liaoning Province to the small brown planthopper. Laodelphax striatellus （Fallen）, were investigated. Resistance to the small brown planthopper was evaluated in 42 cultivated rice varieties, including widely used varieties and those waiting for extension in Liaoning Province lR36 and Wuyujing3 were used as resistant control and susceptible control rice varieties, respectively, and evaluation was undertaken using a modified seedbox screening test. 20 rice varieties with different resistance levels were selected to test their antixenosis and antibiosis mechanisms. Of the 42 varieties tested, one resistant variety, namely Liaoyou5218. was found, along with 11 moderately resistant varieties. All of the other varieties were susceptible or highly susceptible. Compared with conventional rice, hybrid rice is more resistant to small brown planthopper. Among the resistant varieties. diffuse rice varieties are more numerous than compact ones. The resistance mechanism study showed that the resistant variety Liaoyou5218 and the moderately resistant variety Gangyu129 had strong antixenosis and antibiosis against small brown planthopper, and the moderately resistant varieties Gangyuan8 and Jingyou558 had relatively strong antixenosis. These varieties provide ideal genetic resources for breeding new resistant rice varieties. Nevertheless. most of the main cultivated rice varieties in Liaoning are susceptible to the small brown planthopper.