30 documents found, page 1 of 3
In vitro culture Cynara cardunculus var. sylvestris – callogenesis induction an...
Marum, L.; Rodrigues, C.; Pires, R.C.; Faustino, A.; Marinho, C.; Santos, J.; Peixe, A.; Duarte, F.Cynara cardunculus L., a cross-pollinated species complex, has a high level of heterozygosity, giving rise to different phenotypes within populations when propagated by seed. Traditional vegetative propagation of cardoon by offshoot involves the destruction of the mother plant, dissemination of phytosanitary problems, and a low multiplication rate due to the limited number of offshoots produced by the mother pl...
Estudo sobre a origem do enrugamento do miolo da noz
Farinha, D.; Mendes, M.; Barroso, J.M.; Peixe, A.; Dias, A.; Rato, A.E.The Walnut tree (Juglans regia L.) is one of the most consumed nut species that has been gaining importance with the implementation of new orchards from north to south of the country. The incomplete formation of the seed (Kernel Shrivel) is one of the problems that most depreciates the quality and for which there isn’t an effective control due to its unknown origin. The accumulation of seed reserves that result...
Identification of candidate genes involved in olive response to anthracnose for...
Inácio, Diogo; Félix, M.R.; Campos, Catarina; Patanita, Mariana; Ribeiro, Joana A.; Varanda, Carla; Materatski, Patrick; Albuquerque, AndréAnthracnose is a disease that affect the olive tree caused by fungi of the genus Colletotrichum. These fungi are responsible to premature fruit drop and a consequent decrease in the oil quality, and also cause defoliation of trees compromising the production of the following years. Currently the best control strategy is based on application of synthetic fungicides, with a regulatory pressure in agriculture worl...
The Paradox cl. ‘Vlach’ multiplication and rooting rates are strongly affected ...
Campos, M. D.; Peixe, A.; Barroso, J.; Rato, A. E.; Ribeiro, A.; Ribeiro, H.The multiplication and rooting rates achieved from in vitro cultured explants of Paradox cl. ‘Vlach’, proved to be highly affected by their position in the original shoot. Explants taken until the 3 rd internode below the apical meristem, when systematically subcultured each 30 th days, lost their multiplication capacity on each subculture, their regeneration efficiency becoming almost null after 5 subcultures....
Response of Mycorrhizal ’Touriga Nacional‘ Variety Grapevines to High Temperatu...
Nogales, A.; Ribeiro, H.; Nogales-Bueno, J.; Hansen, L.D.; Gonçalves, E.F.; Coito, J.L.; Rato, A.E.; Peixe, A.; Viegas, W.; Cardoso, HéliaHeat stress negatively affects several physiological and biochemical processes in grapevine plants. In this work, two new methods, calorespirometry, which has been used to determine temperature adaptation in plants, and near-infrared (NIR) spectroscopy, which has been used to determine several grapevine-related traits and to discriminate among varieties, were tested to evaluate grapevine response to high temper...
Genome Modification Approaches to Improve Performance, Quality, and Stress Tole...
Peixe, A.; Cardoso, Hélia; Figueiredo, A.; Serrazina, S.; Pires, R,In the last decades the interest on traditional Mediterranean fruits highly increased, not only due to the constant demand of consumers for new crop alternatives, but also due to the identification in such species of molecules with important properties for human health (e.g. resveratrol from grapes and oleuropein from olives). Efforts to improve the production capacity and fruit quality in such fruit species, a...
Estudo histológico sobre a formação de raízes adventícias em estacas caulinares...
Peixe, A.; Serras, M.; Campos, C.; Zavattieri, M. A.; Dias, M. A.S.Mesmo quando estimulada pela aplicação exógena de reguladores de crescimento, a capacidade de enraizamento da oliveira, por estacaria semi-lenhosa, encontra-se muito dependente do genótipo utilizado. É assim possível encontrar cultivares como a Cobrançosa, onde se atingem sem dificuldade taxas de formação de raízes adventícias próximas dos 70%, e cultivares como a Galega vulgar, onde só muito esporadicament...
Quantificação dos níveis endógenos de auxinas e da actividade enzimática das po...
Serra, C.; Antunes, R.; Hegewald, H.; Costa, C.; Pinto, A. P.; Peixe, A.A actividade enzimática de polifenoloxidases foi avaliada em folhas e na zona apical, média e basal de ramos de duas cultivares de oliveira (Olea europaea L.), comuns no Alentejo (Galega vulgar e Cobrançosa), mostrando que a actividade enzimática nas folhas foi muito superior à encontrada em tecidos de ramos do ano. Maior actividade enzimática foi também detectada na variedade Cobrançosa versus Galega vu...
Gestión del estrés oxidativo por la oxidasa alternativa durante la inducción de...
Noceda, C.; Porfírio, S.; Peixe, A.; Arnholdt-Schmitt, B.; Santos-Macedo, E.Los olivos (Olea europaea L.) se propagan fundamentalmente mediante enraizamiento adventicio de estaquillas semileñosas. Sin embargo, la propagación comercial eficiente de cultivares de olivo valiosos puede a menudo verse limitada por baja capacidad de dicho enraizamiento. Con el fin de obtener información biológica que permitiese contribuir a resolver tal problema, se ejecutó un proyecto de investigación funda...
Quantification of free auxins in semi-hardwood plant cuttings and microshoots b...
Pofírio, S.; Sonon, R.; da Silva, M. G.; Peixe, A.; Cabrita, M. J.; Azadi, P.Several studies have suggested that differences in the natural rooting ability of plant cuttings could be attributed to differences in endogenous auxin levels. Hence, during rooting experiments, it is important to be able to routinely monitor the evolution of endogenous levels of plant hormones. This work reports the development of a new method for the quantification of free auxins in auxin-treated Olea europae...