Effects of the parasitization of a braconid, Apanteles, on the blood of its host, Pieris
Effects of the parasitization of a braconid, Apanteles, on the blood of its host, Pieris
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寄生小蠹科 Apanteles 对其宿主菜粉蝶血液的影响
DOI：
10.1016/0022-1910(74)90064-x
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发表时间：
1974
影响因子：
2.2
通讯作者：
H. Kitano
中科院分区：
文献类型：
--
作者：
H. Kitano
菜粉蝶幼虫寄生小蜂Apanteles glomeratus，引起第四龄和五龄寄主幼虫血细胞分类计数（DHC）、总血细胞计数（THC）和对死卵的封装能力的变化。然而，沉积的Apanteles卵数量与THC之间没有发现相关性。四龄中期寄主幼虫的数量或寄生幼虫数量与五龄晚期寄主幼虫血淋巴比重之间的关系。从非寄生和寄生粉蝶幼虫DHC和THC的变化来看，四龄早期非寄生粉蝶幼虫浆细胞数量的增加可能是由于原血细胞转化为原血细胞所致。被寄生的幼虫的浆细胞和可比时期的浆细胞数量较少，被认为是由于拟寄生物卵释放的某些因子抑制了原血细胞的转化。被寄生的第四龄粉蝶幼虫未能封装注射的Apanteles死卵，表明拟寄生物胚胎以某种方式积极抑制宿主的封装反应。寄生的五龄幼虫不能归因于宿主血淋巴体积的减少。相反，它可以通过抑制宿主血腔中的血细胞对组织表面的粘附能力来解释。被寄生的第五龄幼虫的包封能力降低可能归因于寄生导致宿主血淋巴中的血细胞能量来源耗尽而导致的浆细胞粘附活性降低，或者归因于起源于“巨细胞”（畸胎细胞）的分泌物对浆细胞粘附性的主动抑制来自寄生蜂。
Parasitization of a braconid wasp,Apanteles glomeratus, of larvae of a common cabbage butterfly,Pieris rapae crucivora, caused changes in differential haemocyte count (DHC), total haemocyte count (THC), and encapsulative capacity against dead eggs ofApantelesin the fourth and fifth instar host larvae.However, no correlation could be found between the number ofApanteleseggs deposited and THC of the middle fourth instar host larvae or between the number of parasitoid larvae and specific gravity of the haemolymph from the late fifth instar host larvae.From the changes in DHC and in THC of both non-parasitized and parasitizedPierislarvae, an increase in the number of plasmatocytes of non-parasitizedPierislarvae in the early fourth instar period was supposed to be due to transformation of prohaemocytes into plasmatocytes, and a low population of plasmatocytes of parasitized larvae in the comparable period was assumed to be due to a suppression of transformation of prohaemocytes by some factor released from the parasitoid eggs.Failure of the parasitized fourth instarPierislarvae to encapsulate injected dead eggs ofApantelesindicated that the parasitoid embryos were, in some way, actively inhibiting the encapsulation reactions of the host.The increase in THC of the parasitized fifth instar larvae could not be ascribed to a decrease in the volume of host haemolymph. Rather it could be interpreted by a suppression of adhesive capacity of haemocytes in the host haemocoel to tissue surfaces.Reduced encapsulative capacity of the parasitized fifth instar larvae might be attributed either to a depression of the adhesive activity of plasmatocytes resulting from a depletion of energy source for haemocytes in the host haemolymph by parasitization, or from an active suppression of adhesiveness of the plasmatocytes by secretions from ‘giant cells’ (teratocytes) originated from the parasitoid.