【摘 要】
：
甜菜坏死黄脉病毒(Beet necrotic yellow vein virus,BNYVV)是甜菜丛根病的病原,由4-5条+ssRNA组成,其中RNA3编码的p25蛋白是BNYVV在甜菜上的关键致病因子,参与病毒在根中的复制与转移,与病毒侵染后的"毛根"症状相关.当接种毒源中含有野生型RNA3时,就会出现典型的丛根症状,并导致甜菜根重降低95％,病毒浓度提高10-20倍,而当接种毒源中含有RNA
【机 构】
：
中国农业大学植物病理学系与农业生物技术国家重点实验室,北京 100193
【出 处】
：
中国植物病理学会2015年学术年会
论文部分内容阅读
甜菜坏死黄脉病毒(Beet necrotic yellow vein virus,BNYVV)是甜菜丛根病的病原,由4-5条+ssRNA组成,其中RNA3编码的p25蛋白是BNYVV在甜菜上的关键致病因子,参与病毒在根中的复制与转移,与病毒侵染后的"毛根"症状相关.当接种毒源中含有野生型RNA3时,就会出现典型的丛根症状,并导致甜菜根重降低95％,病毒浓度提高10-20倍,而当接种毒源中含有RNA3的自然缺失突变体(p25的C端缺失94或121个氨基酸)或者不含有RNA3时,就没有丛根症状发生,仅造成轻微损失(Koenig et al.,1991；Tamada et al.,1999).另外p25蛋白67 ～ 70位氨基酸(644～655 nt)组成与其致病力密切相关,抗性突破能力(以68位或67与68位氨基酸标示)依次为F＜Y＜C=L=H＜Q＜VC (Chibaetal.,2011).
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