Comparative study of the patterns of encystment and pathogenicity of zoospores of Phytophthora and Pythium spp. on a range of axenically-grown angiosperm roots

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN027151 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Perceptions of forest experts on climate change and fire management in European Mediterranean forests

Climate change has already increased fire risk in Mediterranean forests. Adaptation options related to forest fires and climate change include measures related to fuel management, fire fighting and infrastructure, as well as public awareness. The importance of each of these measures was evaluated in six Mediterranean countries in a study initiated within the COST Action FP0703 "Expected Climate Change and Options for European Silviculture". A questionnaire survey was used to document the views of foresters and forest scientists. Country differences were observed and adaptation measures related to fire fighting efficiency and public awareness were valued as more important than fuel management. Results were discussed in the light of a critical review of adaptive fire management measures with special reference to European Mediterranean countries. © SISEF

Growing scattered broadleaved tree species in Europe in a changing climate: a review of risks and opportunities

Scattered broadleaved tree species such as ashes ( Fraxinus excelsior L. and Fraxinus angustifolia Vahl.), black alder ( Alnus glutinosa (L.) Gaertn.), birches ( Betula pendula Roth. and Betula pubescens Ehrh.), elms ( Ulmus glabra Huds., Ulmus laevis Pall. and Ulmus minor Mill.), limes ( Tilia cordata Mill. and Tilia platyphyllos Scop.), maples ( Acer campestre L., Acer platanoides L. and Acer pseudoplatanus L.), wild service tree ( Sorbus domestica L. and Sorbus torminalis L. Crantz), walnuts ( Juglans regia L., Juglans nigra L. and hybrids) and wild cherry ( Prunus avium L.) are important components of European forests. Many species have high economic, environmental and social values. Their scattered distributions, exacerbated in many cases by human activity, may make them more vulnerable to climate change. They are likely to have less ability to reproduce or adapt to shifting climate space than more widespread species. The general impacts of climate change on these scattered species are reviewed. Some specific risks and opportunities are highlighted for each species, although there is considerable uncertainty and therefore, difficulty in quantifying many specific risks and/or impacts on scattered broadleaved tree species

Podridão de raízes causada por Pythium aphanidermatum, em cultivares de alface produzidas em sistema hidropônico

A podridão de raízes, causada por Pythium aphanidermatum e outras espécies de Pythium, é a principal doença da alface cultivada em sistemas hidropônicos no Brasil. O presente trabalho teve como objetivo avaliar quatro cultivares comerciais de alface em relação à sensibilidade a podridão de raízes, causada por P. aphanidermatum. Os estudos foram realizados em placas de Petri contendo ágar-água com plântulas de alface das cultivares crespa (Vera e Verônica) e lisa (Regina e Elisa), infestadas ou não com o patógeno. Com as mesmas cultivares foram realizados quatro experimentos em sistemas hidropônicos (Nutrient Film Technique), sendo dois em estufa coberta com plástico e sombrite e dois em estufa coberta apenas com plástico. As plântulas, infectadas ou não com P. aphanidermatum, foram transplantadas para os sistemas infestados ou não. Foi avaliada a severidade da doença e o desenvolvimento das plantas. Todas as cultivares foram suscetíveis à podridão de raízes nos experimentos realizados in vitro e in vivo. A presença do sombrite não reduziu a podridão de raízes em cultivares de alface produzidas no sistema hidropônico. A cultivar Regina apresentou maior massa de matéria seca da parte aérea e das raízes, na presença ou ausência do patógeno, sendo a mais indicada para o cultivo hidropônico na época mais quente do ano