P uptake by arbuscular mycorrhizal hyphae:: effect of soil temperature and atmospheric CO2 enrichment
P uptake by arbuscular mycorrhizal hyphae:: effect of soil temperature and atmospheric CO2 enrichment
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DOI：
10.1046/j.1365-2486.2003.00560.x
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发表时间：
2003-01-01
影响因子：
11.6
通讯作者：
Jakobsen, I
中科院分区：
文献类型：
--
作者：
Gavito, ME;Schweiger, P;Jakobsen, I
菌根是一种普遍存在的共生体，在碳从空气到土壤的迁移过程中可能起着重要作用。气候变化因素对菌根影响的研究主要集中在大气[CO2]的影响上，而温度的影响被忽略了。根据以往的结果表明，不同的大气[CO2]的发展和磷吸收的丛枝菌根真菌（AMF）的殖民植物生长在受控条件下，我们假设，土壤温度将有更高的影响AMF的发展和养分吸收比[CO2]对宿主植物的影响。豌豆植物与来自田间土壤的Glomus caledonium或AMF的单一分离物联合生长，并与相应的当前（10 ℃）或升高（15 ℃）的土壤温度在当前（350 p. p. m）或升高（700 p. p. m）的大气[CO2]下因子组合。根外AMF菌丝对P-33的吸收独立于根排隔室中根对P的吸收。根内定殖在两种土壤温度下均发育良好，在10 ~ 15 ℃几乎复制。根外菌丝体仅在15 degreesC下在根排隔室中发育，因此只能在15 degreesC下研究菌丝的磷吸收。菌丝P吸收接种物类型之间的显着差异，但没有改变生长在两个大气[CO2]水平的宿主植物。没有观察到显着的[CO2] x土壤温度的相互作用。结果表明，在测试的系统中，AMF的发展和功能可能更多地受到气候变化的温度分量的影响，而不是其[CO2]分量。我们建议在未来的研究中应更多地关注温度效应。
Mycorrhizas are ubiquitous symbioses that may have an important role in the movement of C from air to soil. Studies on the effects of climate change factors on mycorrhizas have been concentrated on the effects of atmospheric [CO2] whereas temperature effects have been neglected. Based on previous results showing no effect of varying atmospheric [CO2] on the development and P uptake of the arbuscular mycorrhizal fungi (AMF) colonizing plants growing in controlled conditions, we hypothesized that soil temperature would have a higher impact on AMF development and nutrient uptake than the effects of [CO2] on the host plant. Pea plants were grown in association with either a single isolate of Glomus caledonium or AMF from field soil in factorial combination with the corresponding current (10degreesC) or elevated (15degreesC) soil temperatures at current (350 p.p. m) or elevated (700 p.p.m) atmospheric [CO2]. P-33 uptake by extraradical AMF hyphae was measured independently from root P uptake in a root exclusion compartment. Intraradical colonization developed well at both soil temperatures and almost duplicated from 10 to 15degreesC. Extraradical mycelium developed only at 15degreesC in the root exclusion compartment and hyphal P uptake could therefore be studied at 15degreesC only. Hyphal P uptake differed markedly between inoculum types, but was not altered by growing the host plants at two atmospheric [CO2] levels. No significant [CO2] x soil temperature interactions were observed. The results suggested that, in the system tested, AMF development and function is likely more influenced by the temperature component of climate change than by its [CO2] component. We suggest that much more attention should be paid to temperature effects in future studies.