Querejeta J I, Allen M F, Caravaca F, Roldán A
Departamento de Conservación de Suelos y Aguas, Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas (CEBAS-CSIC), PO Box 4195, Campus de Espinardo E-30100 Murcia, Spain.
New Phytol. 2006;169(2):379-87. doi: 10.1111/j.1469-8137.2005.01599.x.
Native, drought-adapted arbuscular mycorrhizal fungi (AMF) often improve host-plant performance to a greater extent than nonnative AMF in dry environments. However, little is known about the physiological basis for this differential plant response. Seedlings of Olea europaea and Rhamnus lycioides were inoculated with either a mixture of eight native Glomus species or with the nonnative Glomus claroideum before field transplanting in a semiarid area. Inoculation with native AMF produced the greatest improvement in nutrient and water status as well as in long-term growth for both Olea and Rhamnus. Foliar delta18O measurements indicated that native AMF enhanced stomatal conductance to a greater extent than nonnative AMF in Olea and Rhamnus.delta13C data showed that intrinsic water-use efficiency in Olea was differentially stimulated by native AMF compared with nonnative AMF. Our results suggest that modulation of leaf gas exchange by native, drought-adapted AMF is critical to the long-term performance of host plants in semiarid environments. delta18O can provide a time-integrated measure of the effect of mycorrhizal infection on host-plant water relations.
在干旱环境中，本地适应干旱的丛枝菌根真菌（AMF）通常比非本地AMF更能提高宿主植物的性能。然而，对于这种植物差异反应的生理基础知之甚少。在半干旱地区进行田间移栽之前，用八种本地球囊霉属物种的混合物或非本地透明球囊霉对油橄榄和鼠李的幼苗进行接种。接种本地AMF对油橄榄和鼠李的养分和水分状况以及长期生长的改善最为显著。叶片δ18O测量表明，在油橄榄和鼠李中，本地AMF比非本地AMF更能提高气孔导度。δ13C数据表明，与非本地AMF相比，本地AMF对油橄榄的内在水分利用效率有不同程度的刺激。我们的结果表明，本地适应干旱的AMF对叶片气体交换的调节对于半干旱环境中宿主植物的长期性能至关重要。δ18O可以提供菌根感染对宿主植物水分关系影响的时间积分测量。
