| 小麦链格孢叶枯病的病原学研究 |
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| 引用本文： | 商鸿生,王春江,王树权.小麦链格孢叶枯病的病原学研究[J].植物病理学报,2000,30(2):129-132. |
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| 作者姓名： | 商鸿生 王春江 王树权 |
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| 作者单位： | 西北农业大学植保系, 陕西杨陵 712100 |
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| 基金项目： | 国家“八五”攻关资助项目(85-010-01-02);国家动植物检疫总局“八五”口岸植检科研项目(85植-01-03) |
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| 摘 要： | 自70年代以来,在黄河中游麦区发生了一种病原菌未知的小麦叶枯病,1993年至1996年依据柯赫氏证病律进行了病原学研究。结果由陕西、甘肃和河南等省采集的田间病叶标样,发现了11个小麦链格孢(Alternaria triticina Prasada and Prabhu)分离菌株。在PCA平板上培养,该菌的初生分生孢子梗着生由(1~)2~5个孢子构成的短链,分生孢子褐黄色,宽卵球形、椭圆形,具3~8个横隔,0~5个纵隔或斜隔,分隔处缢缩,孢子体20~50 μm×10~15 μm,假喙柱形或膝状,5~47.5 μm×4~5μm。接种小麦叶片上出现长卵形、椭圆形褐色斑点,进而扩展成长条形和不规则形病斑,周边有亮黄色晕圈。严重发病常导致叶枯,叶片大部死亡。
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| 关 键 词： | 链格孢叶枯病 小麦链格孢 小麦 病原学 |
| 收稿时间： | 1999-04-28 |
ETIOLOGICAL STUDY ON Alternaria LEAF BLIGHT OF WHEAT |
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| SHANG Hong-sheng,WANG Chun-jiang,WANG Shu-quan.ETIOLOGICAL STUDY ON Alternaria LEAF BLIGHT OF WHEAT[J].Acta Phytopathologica Sinica,2000,30(2):129-132. |
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| Authors: | SHANG Hong-sheng WANG Chun-jiang WANG Shu-quan |
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| Institution: | Department of Plant Protection, Northwestern Agricultural University, Shaanxi 712100, China |
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| Abstract: | The wheat leaf blight caused by an unknowing pathogen occurred in the middle reaches of Yellow River from the 1970s. The etiological study following Koch's postulates,was conducted in 1993-1996. Eleven isolates were identified as Alternaria triticina Prasada and Prabhu,which isolated from field specimen collected in Shaanxi,Gansu and Henan. When cultured on PCA plate,the fungus sporulated as distinct clumps with(1-)2-5 conidia on primary conidiophores. The conidia were tawny brown,broadly ovoid or ellipsoid,restricted,with 3-8 transverse and 0-5 longitudinal or oblique septa. The conidium body measured 20-50 μm×10-15 μm. Pseudorostrum was geniculate or cylindrical,5-47.5 μm×4-5 μm. Brown,oval to elliptical spots,on inoculated leaves,became irregular and usually surrounded with bright yellow marginal zone. Severe infections often caused leaf blight and killed a large majority of the leaves. |
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| Keywords: | Alternaria leaf blight Alternaria triticina wheat etiology |
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