Short-term exposure to elevated atmospheric CO2 benefits the growth of a facultative annual root hemiparasite, Rhinanthus minor (L.), more than that of its host, Poa pratensis (L.)
Short-term exposure to elevated atmospheric CO2 benefits the growth of a facultative annual root hemiparasite, Rhinanthus minor (L.), more than that of its host, Poa pratensis (L.)
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DOI：
10.1093/jxb/erg194
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发表时间：
2003-08-01
影响因子：
6.9
通讯作者：
Woodin, SJ
中科院分区：
文献类型：
--
作者：
Hwangbo, JK;Seel, WE;Woodin, SJ
研究了CO2浓度升高（650 ppm）对叶绿素寄生被子植物小犀牛（Rhinanthus minor， L.）与寄主草芥（Poa pratensis， L.）相互作用的影响。CO2浓度升高有利于小红花的光合作用和生物量增加，而蒸腾作用和组织氮浓度未受影响。然而，这并没有减轻寄生虫对宿主的负面影响；与CO2浓度无关，小叶霉降低了寄主光合作用、蒸腾作用、叶面积和生物量。CO2升高导致寄主光合作用增加，但生物量没有增加，叶面氮含量下降。似乎寄生物对氮的竞争比对碳的竞争更能减少寄主的生长。与预期相反，R. minor并没有降低宿主-寄生虫联合体的生产力，相反，它实际上通过升高的CO2促进了该联合体的生产力。
The effects of elevated CO2 (650 ppm) on interactions between a chlorophyllous parasitic angiosperm, Rhinanthus minor (L.) and a host, Poa pratensis (L.) were investigated. R. minor benefited from elevate CO2, with both photosynthesis and biomass increasing, and transpiration and tissue N concentration remaining unaffected. However, this did not alleviate the negative effect of the parasite on the host; R. minor reduced host photosynthesis, transpiration, leaf area and biomass, irrespective of CO2 concentration. Elevated CO2 resulted in increased host photosynthesis, but there was no concomitant increase in biomass and foliar N decreased. It appears that the parasite may reduce host growth more by competition for nitrogen than for carbon. Contrary to expectation, R. minor did not reduce the productivity of the host-parasite association, and it actually contributed to the stimulation of productivity of the association by elevated CO2.