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通过棉花抗枯萎病品种苗期鉴定,可以反应出不同品种和品系的抗病性。温室系统观察结果,棉苗在1—2片真叶时即有症状出现,以感病品种发生较早。一般在4—5片真叶期,枯萎病发生甚烈。不同品种(系)反应的症状类型有所差异,但大多数属于三个类型:“网纹型”、“青枯型”、“黄叶型”。观察到“网纹”和“黄叶”属慢性类型;“青枯”属急性类型。从242个品种(系)材抖中,鉴定出苗期抗病的品种(系)23个,均属抗型(R)。发病指数0—10%有11系,11—20%有8系,21—30%有4系;其中有免疫类型1系(61—84),发病指数为0。苗期属抗病类型,移植到病圃后,成株期仍反应出较多抗病类型,其中苗期属高抗和免疫株系,成株期的抗性反应亦基本一致。
Through the cotton seedling stage identification of fusarium wilt, can reflect the different varieties and strains of disease resistance. Greenhouse system observations, the cotton seedlings in the 1-2 true leaves when there are symptoms appear to susceptible varieties occurred earlier. Generally 4-5 true leaf stage, blight occurred very intense. The symptoms of different breeds vary, but most of them fall into three categories: “reticulate”, “scabby”, and “yellow leaf”. “Reticulate” and “yellow leaf” are observed as chronic types; “green withered” is an acute type. From 242 cultivars (lines), 23 varieties (lines) resistant to disease at seedling stage were identified, all of which were resistant (R). The incidence index 0-10% of 11 lines, 11-20% of 8 lines, 21-30% of 4 lines; of which immune type 1 line (61-84), the incidence index of 0. The seedling stage belongs to the type of disease resistance. After transplanting to the nursery, more resistant types are still observed in the adult plants, among which the seedlings are highly resistant and immune, and the resistance reactions at the adult stage are also basically the same.