| 摘要: |
| 【目的】对陕西关中地区瓜类白粉病菌的生理小种进行了鉴定,为有效防治陕西关中地区瓜类白粉病及进行抗白粉病新品种的选育奠定基础。【方法】采用国际通用的一整套甜瓜白粉病菌生理小种鉴别寄主，对陕西关中地区不同栽培条件下瓜类作物上收集的38份白粉病菌进行了显微观察和生理小种鉴定。【结果】显微和超显微观察结果表明，采集的38份白粉病菌均是单囊壳白粉菌，其中对Iran H、Topmark、Vedrantais、PMR 45 和 Nantais Oblong等5个甜瓜鉴别寄主高度感病，而对PMR 5、PMR 6、Edisto 47和WMR 29等4个甜瓜鉴别寄主免疫，对PI 124111、PI 124112、PI 414723和MR 1 等4个甜瓜鉴别寄主表现抗病，与单囊壳白粉菌的生理小种 2F.的抗感反应一致。【结论】初步确定陕西关中地区瓜类白粉病菌生理小种为单囊壳白粉菌的生理小种 2F.，未发现其他生理小种。 |
| 关键词: 瓜类白粉病 生理小种 小种鉴定 陕西关中地区 |
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| 基金项目:国家“十一五”科技支撑计划项目(2006BAD01A7-6-07);国家西甜瓜产业技术体系西北旱作栽培岗位科学家项目（nycytx-36-01-02-06）；陕西省科技研究发展计划项目(2007K01-07-04)；西北农林科技大学唐仲英育种基金项目 |
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| Identification of physiological races of cucurbits powdery mildew in Guanzhong areas,Shaanxi Province |
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| Abstract: |
| 【Objective】In order to control local cucurbits powdery mildew and breed new resistant varieties,the physiological races were identified in Guanzhong areas,Shaanxi Province.【Method】Thirty eight pathogen collections of powdery mildew obtained from cucurbits under different conditions of cultivation were detected for physiological races of cucurbits powdery mildew by a set of internationally recognized melon differential hosts.【Result】The observation from microstructure and ultrastructure to Podosphaera xanthii indicated that all 38 powdery mildews collected were P.xanthii.They were highly susceptible to Iran H,Topmark,Vedrantais,PMR 45 and Nantais Oblong;immune to PMR 5,PMR 6,Edisto 47 and WMR 29,resistant to PI 124111,PI 124112,PI 414723 and MR 1,and occured as the same reaction as 2F.of P.xanthii.【Conclusion】It could be preliminarily confirmed that physiological race of cucurbits powdery mildew was the race 2F.of P.xanthii and no other races were discovered in Guanzhong areas,Shaanxi Province. |
| Key words: cucurbits powdery mildew physiological race race identification Guanzhong areas,Shaanxi Province |
