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棉花学报  2012 

新疆南部棉区黄萎病菌种群致病性分化及变异

DOI: 1002-7807(2012)02-0147-06, PP. 147-152

Keywords: 黄萎病菌,致病性分化,致病类型,落叶症状,新疆南疆

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Abstract:

采用鉴别寄主法和特异性引物PCR检测技术对采自新疆南部(南疆)棉区的36个棉花黄萎病菌菌系进行检测,以期明确其病原种群致病性分化及变异情况。鉴别寄主法测定结果显示供试菌系中致病性强、中、弱的菌系分别为27个、4个和5个,各占75.0%,11.1%和13.9%。特异性引物(ND1/ND2和D1/D2)PCR检测结果显示,供试36个菌系中落叶型菌系12个,占33.3%;非落叶型菌系24个,占66.7%。经统计,落叶型菌系的致病力明显高于非落叶型菌系,其平均病指分别为43.8和31.8。接种试验证明,无论落叶型菌系和非落叶型菌系,接种后都可产生落叶症状,但落叶的情况有明显差别,落叶症状的轻重不仅与菌系的致病类型有关,还与棉花品种的抗病性密切相关。

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