Kover P X
Indiana University, Biology Department, Jordan Hall, Box A069, Bloomington, IN 47405, USA, , , , , , US.
Oecologia. 2000 Apr;123(1):48-56. doi: 10.1007/s004420050988.
It has been proposed that host castration is a parasite strategy to reallocate host resources from reproductive to vegetative functions to increase parasite fitness. Since resource partitioning between reproduction and vegetative growth can affect host life-history traits, parasite effects on resource allocation can affect both plant fitness and host-parasite coevolution. Field and greenhouse experiments were used to investigate the effects of host castration by the fungus Atkinsonella hypoxylon on the resource allocation and architecture of the grass Danthonia spicata. The results indicate that non-infected D. spicata can reallocate resources from reproduction to vegetative growth when resource allocation to reproduction is prevented. However, I found no evidence that fungal castration causes reallocation of resources from host reproduction to vegetative growth. Instead, infection reduces host biomass and the fungus directly utilizes resources that would have been used for host reproduction for its own reproduction.
有人提出，宿主去势是一种寄生虫策略，可将宿主资源从生殖功能重新分配到营养功能，以提高寄生虫的适合度。由于生殖与营养生长之间的资源分配会影响宿主的生活史特征，寄生虫对资源分配的影响会同时影响植物适合度和宿主-寄生虫的协同进化。利用田间和温室实验来研究真菌 Hypoxylon atkinsonella 对宿主去势对草本植物穗三毛（Danthonia spicata）的资源分配和结构的影响。结果表明，当阻止向生殖的资源分配时，未感染的穗三毛可以将资源从生殖重新分配到营养生长。然而，我没有发现证据表明真菌去势会导致资源从宿主生殖重新分配到营养生长。相反，感染会减少宿主生物量，并且真菌直接利用原本会用于宿主生殖的资源来进行自身繁殖。
