<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Dias, J. M.</style></author><author><style face="normal" font="default" size="100%">Oliveira, R. S.</style></author><author><style face="normal" font="default" size="100%">Franco, A. R.</style></author><author><style face="normal" font="default" size="100%">Ritz, K.</style></author><author><style face="normal" font="default" size="100%">Nunan, N.</style></author><author><style face="normal" font="default" size="100%">Castro, P. M. L.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Assessment of mycorrhizal colonisation and soil nutrients in unmanaged fire-impacted soils from two target restoration sites</style></title><secondary-title><style face="normal" font="default" size="100%">Spanish Journal of Agricultural Research;</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">arbuscular mycorrhiza</style></keyword><keyword><style  face="normal" font="default" size="100%">ectomycorrhiza</style></keyword><keyword><style  face="normal" font="default" size="100%">Pinus pinaster</style></keyword><keyword><style  face="normal" font="default" size="100%">post fire</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">soil restoration</style></keyword><keyword><style  face="normal" font="default" size="100%">spatial variation</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2010///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://revistas.inia.es/index.php/sjar/article/view/1226/1178</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">86 - 95</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The mycorrhizal colonisation of plants grown in unmanaged soils from two restoration sites with a fire history in Northern Portugal was evaluated from the perspective of supporting restoration programmes. To promote restoration of original tree stands, Quercus ilex L. and Pinus pinaster Ait. were used as target species on two sites, denoted Site 1 and 2 respectively. The aim of the study was to assess whether mycorrhizal propagules that survived fire episodes could serve as in situ inoculum sources, and to analyse the spatial distribution of soil nutrients and mycorrhizal parameters. In a laboratory bioassay, P. pinaster and Q. ilex seedlings were grown on soils from the target sites and root colonisation by ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) fungi was determined. The ECM root colonisation levels found indicated that soil from Site 2 contained sufficient ECM propagules to serve as a primary source of inoculum for P. pinaster. The low levels of ECM and AM colonisation obtained on the roots of plants grown in soil from Site 1 indicated that the existing mycorrhizal propagules might be insufficient for effective root colonisation of Q. ilex. Different ECM morphotypes were found in plants grown in soil from the two sites. At Site 2 mycorrhizal parameters were found to be spatially structured, with signif icant differences in ECM colonisation and soil P concentrations between regions of either side of an existing watercourse. The spatial distribution of mycorrhizal propagules was related to edaphic parameters (total C and extractable P), and correlations between soil nutrients and mycorrhizal parameters were found.</style></abstract><issue><style face="normal" font="default" size="100%">Special issue (S1). DEDICATED TO COST ACTION 870.</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kleikamp, Bernd</style></author><author><style face="normal" font="default" size="100%">Joergensen, Rainer Georg</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Evaluation of arbuscular mycorrhiza with symbiotic and nonsymbiotic pea isolines at three sites in the Alentejo, Portugal</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Plant Nutrition and Soil Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">amf</style></keyword><keyword><style  face="normal" font="default" size="100%">arbuscular mycorrhiza</style></keyword><keyword><style  face="normal" font="default" size="100%">growth response</style></keyword><keyword><style  face="normal" font="default" size="100%">mediterranean dryland farming</style></keyword><keyword><style  face="normal" font="default" size="100%">myc-mutant</style></keyword><keyword><style  face="normal" font="default" size="100%">p and n nutrition</style></keyword><keyword><style  face="normal" font="default" size="100%">pea</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2006</style></year></dates><volume><style face="normal" font="default" size="100%">169</style></volume><pages><style face="normal" font="default" size="100%">661-669</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Providing an appropriate negative control for the experimental factor arbuscular mycorrhiza (AM) is a fundamental methodological problem. Therefore, the nonmycorrhizal (myc – ) and nonnodulating (nod – ) pea (Pisum sativum L.) mutant P2 was studied together with the parental symbiotic isogenetic variety FRISSON in three experiments: (1) growth response to water supply in a climate chamber under nonsymbiotic growth conditions, (2) field evaluation at three sites in the Alentejo, South Portugal, and (3) growth response to P supply in a soil low in available P in a greenhouse-chamber experiment. In the climate chamber at high NPK levels, mutant P2 achieved the same biomass as FRISSON at 80% and 40% water-holding capacity, respectively. For the field evaluation, three sites were chosen with normal arable use (Évora), extensive use as Montado (Portel), and intensive horticultural use (Mitra). The colonization of pea roots with AM fungi ranged from 4% (Mitra) to more than 90% (Portel), probably caused by differences in P availability. The plant density of mutant P2 was generally 25% lower than that of FRISSON. Yield indices were all lowest at Portel, despite the same NPK fertilization. Grain and shoot yield of mutant P2 did not reach the level of FRISSON at any site. Differences in N and P concentrations between the two isolines were insignificant in most cases. Differences in the amount of shoot P per plant consistently mirrored the mycorrhizal status of the three sites. Roughly 50% of the yield depression per m2 could be attributed to the lower plant density of mutant P2, the remaining 50% must be caused by AM-fungal colonization or other factors. In the final pot experiment using the soil with low P availability from Portel, the main benefit of AM for peas was enhanced P uptake. Central questions could not be answered using a nonmycorrhizal control. However, mutants remain one interesting tool, best be used in combination with other approaches to estimate the effects of mycorrhization.</style></abstract></record></records></xml>