نتایج جستجو برای: fraxinus excelsior
تعداد نتایج: 1212 فیلتر نتایج به سال:
Whereas most of the research on phloem loading is performed on herbaceous plants, less is known about phloem loading strategies in trees. In this study, the phloem loading mechanisms of Quercus robur and Fraxinus excelsior were analysed. The following features were examined: the minor vein structure, the sugar concentrations in phloem sap by the laser-aphid-stylet technique, the distribution of...
Trees are generally assumed to be symplastic phloem loaders. A typical feature for most wooden species is an open minor vein structure with symplastic connections between mesophyll cells and phloem cells, which allow sucrose to move cell-to-cell through the plasmodesmata into the phloem. Fraxinus excelsior (Oleaceae) also translocates raffinose family oligosaccharides in addition to sucrose. Su...
Forests worldwide are currently threatened by a number of non-native tree diseases. Widespread death of a tree species will have ecological impacts on species that in some way depend on that tree species to complete their life-cycle. One measure to mitigate these impacts is to establish alternative tree species to replace the threatened tree species. These alternative tree species should be as ...
زیر گونه Fraxinux excelsior subsp. excelsior برای اولین بار از ایران گزارش می‌شود. دو واریتهFraxinus angustifolia subsp. syriaca var. pilosa و F. angustifolia subsp. persica var. pubescens بر اساس نمونه‌های متعدد هرباریومی موجود و جمع‌آوری شده از غرب (زاگرس) به عنوان واحدهای جدید نامگذاری و شرح داده می‌شوند. ترکیب جدید Fraxinus angustifolia subsp. persica نیز معرفی می‌گردد. مطالعات صحرایی ن...
Alnus glutinosa, Fraxinus excelsior and Papaver rhoeas have long been used in folkloric medicine for the treatment of various ailments. As part of our continuing screening of plant extracts for activities, the extracts of A. glutinosa, F. excelsior and P. rhoeas have been screened for their antioxidant and antibacterial activities, as well as their general toxicity towards brine shrimps. Among ...
An emerging infectious pathogen Hymenoscyphus pseudoalbidus has spread across much of Europe within recent years causing devastating damage on European common ash trees (Fraxinus excelsior) and associated plant communities. The present study demonstrates the presence of additive genetic variation in susceptibility of natural F. excelsior populations to the new invasive disease. We observe high ...
alnus glutinosa, fraxinus excelsior and papaver rhoeas have long been used in folkloric medicine for the treatment of various ailments. as part of our continuing screening of plant extracts for activities, the extracts of a. glutinosa, f. excelsior and p. rhoeas have been screened for their antioxidant and antibacterial activities, as well as their general toxicity towards brine shrimps. among ...
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