| 摘要: |
| 从棉田采集多种(包括10科20余种)不表现症状的杂草根部,分离得丝核菌属(Rhizoctonia)真菌多株。用这些菌种在灭菌土壤接种棉苗,几乎全部可以在棉苗上致病,只是症状一般轻于从棉株上分离的丝核菌系。从形态鉴定看出,除狗尾草(Setaria-Viridis)和画眉草(Eragrostis cilianesis)上的菌系以外,所分出的绝大多数菌株都属于立枯丝核菌(Rhizoctonia solani)这个种,与棉花立枯病菌同属一个种。结果证明,以分布普遍、腐生能力极强,寄主范围广的立枯丝核菌有多种无症寄主。这种现象对于了解立枯菌的生态和防治都是很关重要的。 |
| 关键词: 画眉草 丝核菌属 棉田 立枯病菌 寄主范围 菌株 棉苗 杂草 致病力 立枯丝核菌 |
| DOI： |
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| 基金项目: |
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| OBSERVATIONS ON THE SYMPTOMLESS WEED CARRIERS OF Rhizoctonia IN COTTON FIELD |
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| Abstract: |
| Isolates of Rhizoctonia were isolated from the roots of symptomless weeds collected from cotton field.Most of these isolates are pathoge- nic to cotton seedlings growing in disinfected soil and inoculated with each culture.In general,the symptoms caused by weeds strains are milder than those by cotton strains. According to the morphological characteristics,all but the two from graminiaceae,are considered R.solani,the same species of cotton damping-off pathogen. The significance of the widely distributed sym... |
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