Suppression of host photosynthesis by the parasitic plant Rhinanthus minor
Suppression of host photosynthesis by the parasitic plant Rhinanthus minor
复制标题
DOI：
10.1093/aob/mcm324
复制
发表时间：
2008-03-01
期刊：
影响因子：
4.2
通讯作者：
Irving, Louis J.
中科院分区：
文献类型：
--
作者：
Cameron, Duncan D.;Geniez, Jean-Michelle;Irving, Louis J.
背景和目的众所周知，寄生性对迄今为止所表征的物种的宿主性能具有广泛的有害影响。在独脚金-玉米组合中已经注意到光合作用性能的降低;方法采用叶绿素荧光法研究了半寄生植物小鼻菊（Rhinanthus minor）对禾本科植物Phenolinii和杂类植物Plantagolanceolata的寄生效应，以及寄主种类对红腹小卷蛾光合机构的影响。关键结果Rhinanthus的寄生导致Phantoms中宿主和总（宿主+寄生物）生物量的显著降低;然而，在车前属中，没有注意到生长的显著抑制。最大量子产率（F-v/F-m）的减少，在寄生车前，相对于对照植物，但不是在Phenomena。Fv/Fm在R.对蚤蝇的寄生性弱于车前，表明蚤蝇是比车前更好的上级寄主。minor.稳态量子产率（Phi（PSII））显着抑制寄生Phantom，但仅在低辐照度车前。Phi（PSII）极低;结论这里显示的是第一个证据的抑制宿主光合作用的兼性半寄生植物，这对总生物量生产有显着的影响。宿主身份是寄生成功的一个重要因素，与杂类车前表现出明显的化学以及先前确定的物理防御寄生。有人提出，电子传递速率（表示为Phi（PSII））代表的限制因素，在这个系统中的生物量积累，和车前是能够抑制生长的Rhinanthus通过抑制电子传递速率。
Background and Aims Parasitism is well understood to have wide-ranging deleterious effects on host performance in species thus far characterized. Photosynthetic performance reductions have been noted in the Striga-Zea mays association; however, no such information exists for facultative hemiparasitic plants and their hosts, nor are the effects of host species understood.Methods Chlorophyll fluorimetry was used to study the effects of parasitism by the hemiparasite Rhinanthus minor on the grass Phleum bertolinii and the forb Plantago lanceolata, and the effects of host species on the photosynthetic apparatus of R. minor.Key Results Parasitism by Rhinanthus led to a significant decrease in the host, and total (host + parasite) biomass in Phleum; however, in Plantago, no significant repression of growth was noted. Maximum quantum yield (F-v/F-m) was reduced in parasitized Plantago, relative to control plants, but not in Phleum. Fv/Fm was significantly lower in R. minor parasitizing Phleum than Plantago, suggesting Phleum to be a superior host to Plantago for R. minor. Steady-state quantum yield (Phi(PSII)) was significantly depressed in parasitized Phleum, but only at low irradiances in Plantago. Phi(PSII) was very low for R. minor grown on Plantago, but not Phleum.Conclusions Shown here is the first evidence of the suppression of host photosynthesis by a facultative hemiparasitic plant, which has significant effects on total biomass production. Host identity is a significant factor in parasite success, with the forb Plantago lanceolata exhibiting apparent chemical as well as previously identified physical defences to parasitism. It is proposed that the electron transport rate (as denoted by Phi(PSII)) represents the limiting factor for biomass accumulation in this system, and that Plantago is able to suppress the growth of Rhinanthus by suppressing the electron transport rate.