水稻稻瘟病和纹枯病抗性鉴定方法

贺闽, 尹俊杰, 冯志明, 朱孝波, 赵剑华, 左示敏, 陈学伟

Methods for Evaluation of Rice Resistance to Blast and Sheath Blight Diseases

Min He, Junjie Yin, Zhiming Feng, Xiaobo Zhu, Jianhua Zhao, Shimin Zuo, Xuewei Chen

表2 水稻幼苗期叶瘟调查的分级标准

Table 2 Grades of blast severity of rice seedlings

Disease score Resistance level State of disease 0 High resistance (HR) No blast lesion 1 Resistance (R) Only needle-shaped brown lesion s- pots 2 R Slightly large brown spots with diameter less than 1 mm 3 Medium re- sistance (MR) Round or oval gray lesion which shows brown edge and appear diameter between 1-2 mm 4 Medium su- sceptibility (MS) Typical spindle lesion which has leng- th between 1-2 cm. The lesion is us- ually confined between two veins of a leaf and the lesion area occupies less than 2.0% of a leaf 5 MS Typical spindle lesion whose area occupies the leaf area between 2.1%- 10.0% 6 Susceptibility (S) Typical spindle lesion whose area occupies the leaf area between 10.1%- 25.0% 7 S Typical spindle lesion whose area occupies the leaf area between 25.1%- 50.0% 8 High sus- ceptibility (HS) Typical spindle lesion whose area occupies the leaf area between 50.1%- 75.0% 9 HS Typical spindle lesion whose area oc- cupies more than 75.1% of the leaf area