杂交稻对稻瘟病和稻白叶枯病的抗性鉴定

对广东省将推广的54份杂交稻组合对稻瘟病和白叶枯病的抗病性进行了鉴定。对稻瘟病的抗病性鉴定表明:抗病组合共49个,占90.7%;其中,高抗(抗性比≥91%)组合30个,占55.6%。对稻白叶枯病的抗病性鉴定表明:没有高抗(HR)和抗(R)的组合,仅有一个杂交稻组合(西胜2175)表现为中抗(mR),仅占1.9%,其余53个组合都表现感病,占98.1%。进一步分析表明:对稻瘟病表现高抗的30个杂交稻组合都不抗白叶枯病,而中抗白叶枯病的杂交稻组合西胜2175对稻瘟病表现为中抗,抗性比为74%。

Identification of the resistance of hybrid rice combinations against rice blast and rice bacterial leaf blight

Fifty-four hybrid rice combinations(HRC)were identified for the resistance to both of rice blast(Magnaporthe grisea)and rice bacterial leaf blight(Xanthomonas oryzea pv.oryzea).The results showed that 49 of them(90.7%)were resistant to rice blast and 30 were highly resistant(the resistant frequency was above 91%).As to the resistance to rice bacterial leaf blight,only one HRC,Xisheng 2715,was medially resistant(mR),no highly resistant(HR)and resistant(R)HRCs were observed.The results also revealed that all of the highly resistant combinations to rice blast were susceptible to rice bacterial leaf blight,while the medially resistant HRC,Xisheng 2715,to rice bacterial leaf blight was also resistant to rice blast with the resistance frequency as 74%.