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4 田间纹枯病病级的评价标准

Table 4 Rating scales for determining sheath blight disease severity on rice using field inoculation method

Disease sore Sheath blight severity 0 Plant healthy, no symptoms 1 Lesions mainly restricted to the emerged portion of sixth sheath from top on the culm 1.5 Lesions extending to lower 1/2 of the emerged portion of fifth sheath from top on the culm 2 Lesions extending to upper 1/2 of the emerged portion of fifth sheath from top on the culm 2.5 Lesions extending to lower 1/2 of the emerged portion of fourth sheath from top on the culm 3 Lesions extending to upper 1/2 of the emerged portion of fourth sheath from top on the culm 3.5 Lesions extending to lower 1/2 of the emerged portion of third sheath from top on the culm 4 Lesions extending to upper 1/2 of the emerged portion of third sheath from top on the culm 4.5 Lesions extending to lower 1/2 of the emerged portion of second sheath from top on the culm 5 Lesions extending to upper 1/2 of the emerged portion of second sheath from top on the culm 5.5 Lesions extending to lower 1/4 of the emerged portion of flag leaf sheath from top on the culm 6 Lesions usually coalescing and reaching to lower 1/4 to 1/2 of the emerged portion of flag leaf sheath on the culm 6.5 Lesions usually coalescing and reaching to lower 1/2 to 3/4 of the emerged portion of flag leaf sheath on the culm 7 Lesions usually coalescing and reaching to upper 1/4 of the emerged portion of flag leaf sheath on the culm 7.5 Lesions usually coalescing and reaching to lower 1/2 of flag leaf on the culm, the flag leaf presenting semi-rolling or <50% flag leaf tissues affected 8 Lesions usually coalescing and reaching to upper 1/2 of flag leaf on the culm, more than 50% flag leaf tissues affected 8.5 Panicle rachis and culm with brown streak and becoming light brown, all sheath and leaf tissues dead and drying on the culms, florets in lower 1/3 of panicle often not filling on the culm 9 Panicle rachis and culm dead and becoming dry, severely affected culms lodging, florets in lower 1/3 to 1/2 or more of panicle not filling on the culm