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香榧Torreya grandis‘Merrillii’是榧树Torreya grandis经人工嫁接繁殖而成的优良栽培类型[1],具有极高的经济价值、生态价值和文化价值,是集材用、药用、果用、油用和观赏于一体的多功能珍贵树种[2-3]。近几年香榧产业发展迅速,使得香榧产区有了很大的扩展。新老产区香榧林多为纯林,在相对单一的生态环境中易成片感染各种病虫害。香榧瘿螨Nalepella abiesis是香榧的主要虫害之一,其种名最初鉴定为冷杉大嘴瘿螨Rhyncaphytopus abiesis[4],2013年经重新分类后更名为Nalepella abiesis[5]。国外尚无该种瘿螨的相关报道。瘿螨是一类古老的高度微型化、形态简化和多样化的植食性寄生螨[6],大多数种类对寄主植物具有高度专一性[7]。瘿螨靠其螯肢演化的口针刺入寄主组织,以吸食细胞里的汁液和营养物质为生[8]。瘿螨可以为害植物的叶、芽、果实、茎干等部位,大部分瘿螨属于自由生活型,寄生在植物表面,少部分能引起寄主植物产生各种虫瘿、毛毡等症状[9],使寄主植物器官发生畸形,组织结构发生改变。香榧瘿螨属于寡食性昆虫,且自由生活在香榧树体地上部分的器官表面,以叶片为主要寄生场所。目前,关于香榧瘿螨的研究甚少,仅有一些关于香榧瘿螨生物学特性和发生规律[4, 10-11]及防治[11]的研究报道,但针对瘿螨吸食为害香榧叶片部位却存在着不同说法[12]。本研究从植物形态解剖学的角度探究香榧瘿螨为害对香榧叶片结构及叶绿素质量分数的影响,以期对香榧瘿螨的为害机理和防治提供理论基础。
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