以3年对12个品种穗颈段的400余切片观察,发现易感病区(稻穗颈节下1厘米处)的绿色细胞群和细胞数的多少,可用以鉴别品种的抗、感病程度。绿色细胞的中、小群数占50％以上,每群细胞数在30个以下,横切面绿色细胞总数在700个以下的结构表现抗病;凡绿色细胞的大群数占80％以上,每群绿色细胞在50个以上,横切面绿色细胞总数在1000个以上的结构表现感病;居于两者之间的为中间型。 Three years of 12 varieties of panicle neck section of more than 400 sections observed in the susceptible ward (1 cm below the neck of rice panicle) of the green cell population and the number of cells can be used to identify the varieties of resistance, flu degree. Green cells in the small group of more than 50%, each group of cells in less than 30, cross-section of the total number of green cells in the structure of less than 700 showed disease resistance; where the large group of green cells accounted for more than 80%, each group Green cells in more than 50, cross-sectional green cells in the total number of more than 1000 in the performance of susceptible structure; living in between the two for the intermediate type.