Phototactic Behavior of Bemisia argentifolii (Homoptera: Aleyrodidae) Crawlers
Phototactic Behavior of Bemisia argentifolii (Homoptera: Aleyrodidae) Crawlers
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银粉虱（同翅目：粉虱科）爬虫的趋光行为
DOI：
10.1093/aesa/90.3.372
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发表时间：
1997
影响因子：
2.3
通讯作者：
C. Summers
中科院分区：
文献类型：
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作者：
C. Summers
在田间和实验室观察到，第一批幼虫(爬行者)在植物上向上移动，可能是为了寻找可接受的取食地点。在寄主植物和人造表面上进行了实验室实验，以确定这种移动是随机的，还是对光(趋光性)或重力(趋地性)的反应。在寄主植物和黑色建筑纸人造表面上进行的实验中，温室饲养的银叶柏爬虫具有明显的趋光性。爬虫以同样的速度沿着芝麻属植物Malva parviflora L.的叶柄向上或向下移动，朝着放置在叶片上方或下方的光源移动。反应总是朝向光线(正趋光性)，对重力没有反应，无论是积极的还是消极的。在黑暗的竞技场中，爬行器被放置在人造表面上，并提供一个点光源，对光有显著的平均角度分散。在统一的头顶照明下或被困在黑暗中的爬行者在竞技场上随机移动。爬行者在黑暗中保持在奶酪草上，人造表面从它们的起点移动的距离比那些暴露在阳光下的爬行者短得多。这种行为表明，可能需要一些最低的光照强度来刺激爬行者的活动。这种积极的趋光性反应可能通过使秋季产卵的个体在冬季变得衰老的叶片上找到适合生长的叶片，从而有助于银叶菜蛾的存活。
First instars (crawlers) of Bemisia argentifolii Bellows & Perring were observed in the field and laboratory to move upward on plants, presumably in search of acceptable feeding sites. Laboratory experiments were conducted on a host plant and an artificial surface to determine if this movement was random, or a response to light (phototaxis) or gravity (geotaxis). Greenhouse-reared B. argentifolii crawlers were positively phototactic in experiments conducted on a host plant and on an artificial surface of black construction paper. Crawlers moved up or down the petiole of cheeseweed, Malva parviflora L., with equal facility, toward a light source placed either above or below the leaf blade. Response was always toward the light (positive phototaxis) and there was no response to gravity, either positive or negative. Crawlers placed on an artificial surface in a dark arena and presented with a point light source had a significant mean angular dispersion toward the light. Crawlers illuminated with uniform overhead lighting or kept in darkness moved about the arena at random. Crawlers maintained in darkness on cheeseweed and the artificial surface moved a significantly shorter distance from their origin than did those exposed to light. Such behavior suggests that some minimal light intensity may be necessary to stimulate crawler activity. The positive phototactic response may contribute to survival of B. argentifolii by enabling individuals eclosing from fall laid eggs, on leaves that become senescent during the winter, to find suitable leaves for development higher on the plant.