http://hdl.handle.net/10451/3961 Wed, 22 May 2013 05:29:42 GMT 2013-05-22T05:29:42Z http://hdl.handle.net/10451/5991 Title: Mycotrophic conditions of populus nigra and P. x euramericana. Evaluation of endo vs ectomycorrhiza Authors: Gonçalves, M. T.; Martins-Loução, M. A. Abstract: This is the first work concerning the evaluation of mycorrhizal status of Populus nigra and P. x euramericana in Portugal. Concerning the stage of development, juvenile or mature, ectomycorrhizae and arbuscular mycorrhizae were found in both species, coexisting in different root branches of the same root system. Ectomycorrhizae are predominant in mature plants, while arbuscular mycorrhizae predominate in juvenile cuttings. Different morphotypes of ectomycorrhizas have been observed in P. nigra and only one in P. x euramericana. Mon, 01 Jan 1996 00:00:00 GMT http://hdl.handle.net/10451/5991 1996-01-01T00:00:00Z http://hdl.handle.net/10451/4579 Title: Final report COST action 729 : assessing and managing nitrogen fluxes in the atmosphere-biosphere system in Europe Authors: Martins-Loução, Maria Amélia; Branquinho, Cristina; Cruz, Cristina Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10451/4579 2011-01-01T00:00:00Z http://hdl.handle.net/10451/4562 Title: Mycorrhization of cork oak micropropagated plantlets : its vitality during acclimatization measured with fast fluorescence techniques Authors: Romano, A.; Strasser, R. J.; Eggenberg, P.; Martins-Loução, M. A. Abstract: In this work we propose some fluorescense tests, based on a fast data acquisition (10 us per data point with 12 bit resolution) over five orders of magnitude in time (10 us to 1s) with an optoelectronic shutterless instrument (Plant Efficiency Analyser - PEA), to evaluate the response of micropropagated cork oak plantlets with or without mycorrhiza, in vitro and ex vitro conditions. Indexes have been defined which indicate the activity, efficiency, stress resistance, adaptability and developmental complexity of a plant. The shape of the observed fluorescence transient (on a logarithmic time scale) showed the typical Fo-J-I-P levels. The results obtained showed that mycorrhization increases the quantum yield of photochemistry as well as the electron transport and the photosynthetic metabolism. The density of photosynthetic units per leaf area is highly increased in mycorrhized plantlets. Therefore the productivity per leaf area is increased in these plantlets as well. During acclimatization mycorrhized plantlets show a much higher general fitness than non-mycorrhized plantlets in relation to the defined indexes. Mon, 01 Jan 1996 00:00:00 GMT http://hdl.handle.net/10451/4562 1996-01-01T00:00:00Z http://hdl.handle.net/10451/4537 Title: A cultura da alfarrobeira Authors: Loução, Maria A.; Carvalho, J. H. Brito de Sun, 01 Jan 1989 00:00:00 GMT http://hdl.handle.net/10451/4537 1989-01-01T00:00:00Z