Querejeta José Ignacio, Barea José Miguel, Allen Michael F, Caravaca Fuensanta, Roldán Antonio
Center for Conservation Biology, The University of California, Riverside, CA 92521-0124, USA.
Oecologia. 2003 May;135(4):510-5. doi: 10.1007/s00442-003-1209-4. Epub 2003 Mar 28.
During a revegetation field experiment in Southeast Spain, we measured foliar carbon isotope ratios (delta13C) and gas exchange parameters in order to evaluate the influence of arbuscular mycorrhizal (AM) infection on the water use efficiency (WUE) of two semiarid woodland species. WUE during drought was significantly enhanced by inoculation with Glomus intraradices in Olea europaea ssp sylvestris, but not in Rhamnus lycioides. While Olea is a long-lived, slow-growing evergreen tree with a conservative water use strategy, Rhamnus is a drought-deciduous shrub with a shorter lifespan; these differences may explain their dissimilar patterns of physiological response to inoculation with the same AM fungus. Differences in delta13C and WUE between Olea and Rhamnus were larger when comparing AM inoculated than non-inoculated seedlings. This result suggests that some of the interspecific variability in delta13C observed for aridland plant communities may be due to different physiological responses to mycorrhization.
在西班牙东南部的一次植被恢复田间试验中，我们测量了叶片碳同位素比率（δ13C）和气体交换参数，以评估丛枝菌根（AM）感染对两种半干旱林地物种水分利用效率（WUE）的影响。干旱期间，接种根内球囊霉可显著提高油橄榄（Olea europaea ssp sylvestris）的水分利用效率，但对鼠李（Rhamnus lycioides）则无此效果。油橄榄是一种寿命长、生长缓慢的常绿乔木，具有保守的水分利用策略，而鼠李是一种干旱落叶灌木，寿命较短；这些差异可能解释了它们对相同AM真菌接种的生理反应模式不同。与未接种AM的幼苗相比，接种AM的油橄榄和鼠李之间的δ13C和水分利用效率差异更大。这一结果表明，干旱地区植物群落中观察到的δ13C种间变异性部分可能归因于对菌根形成的不同生理反应。
