Two sympatric root hemiparasitic Pedicularis species differ in host dependency and selectivity under phosphorus limitation
Two sympatric root hemiparasitic Pedicularis species differ in host dependency and selectivity under phosphorus limitation
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DOI：
10.1071/fp12159
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发表时间：
2012-01-01
影响因子：
3
通讯作者：
Guan, Kai-Yun
中科院分区：
文献类型：
--
作者：
Li, Ai-Rong;Smith, F. Andrew;Guan, Kai-Yun
标题马先蒿属寄生生物学。列当科列当属植物分布广泛，具有潜在的生态学意义，但目前对其研究尚不充分。为了更好地了解寄生方面的根半寄生虫，寄主-寄生虫的相互作用进行了调查与两个同域的马先蒿属物种，马先蒿雷克斯C。B。Clarke和三色马先蒿Pedicularis tricolor Hand.马兹两个发展阶段。通过盆栽试验，测定了马先蒿与寄主植物或其同类植物共生后的植株干重、地上部磷含量、根冠比和吸器数。此外，寄生和种内竞争的生长和生物量分配属于三个主要功能群（草，豆科植物和杂类草）的四个主机种的影响进行了研究。这两种马先蒿属植物对寄主有明显的选择性，但选择的寄主种类不同。马先蒿属植物与寄主植物的相互作用既取决于种属身份，也取决于寄主植物的发育阶段。总的来说，雷克斯蚤对寄主的依赖性比三色蚤弱得多，对寄主的伤害也小得多。不同寄主对种内竞争和寄生的反应存在种间差异。我们得出结论，不同的马先蒿-主机对表现出不同的相互作用模式。同域马先蒿对植物群落结构和生产力的影响可能存在差异。
Parasitic biology of Pedicularis L. (Orobanchaceae) has been underinvestigated despite its wide distribution and potential ecological significance. To better understand the parasitic aspects of the root hemiparasites, host-parasite interactions were investigated with two sympatric Pedicularis species, Pedicularis rex C. B. Clarke and Pedicularis tricolor Hand.-Mazz., at two developmental stages. Plant DW, shoot phosphorus (P) content, root : shoot ratio and number of haustoria were measured in Pedicularis grown with either a host plant or a plant of its own species in pot experiments. In addition, effects of parasitism and intraspecific competition on growth and biomass allocation in four host species belonging to three major functional groups (grasses, legumes and forbs) were investigated. The two Pedicularis species showed obvious host preference, but preferred different host species. Interactions between Pedicularis and their hosts depended on both species identity and developmental stages of the partners. Overall, P. rex showed much weaker host dependency and less damage to hosts than P. tricolor. Interspecific variations were observed among different host species in their responses to intraspecific competition and parasitism. We concluded that different Pedicularis-host pairs showed different interaction patterns. Sympatric Pedicularis may have differential influence on plant community structure and productivity.