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5 resultados
Developmental evolution of flowering plant pollen tube cell walls: callose synthase (CalS) gene expression patterns.
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BACKGROUND
A number of innovations underlie the origin of rapid reproductive cycles in angiosperms. A critical early step involved the modification of an ancestrally short and slow-growing pollen tube for faster and longer distance transport of sperm to egg. Associated with this shift are the
Fine structure of callus phloem in Pinus pinea.
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The fine structure of phloem formed spontaneously in callus grown on leaf explants of Pinus pinea is very similar to that found in the stem. On the other hand very little callose is formed on callus phloem pores, and their structure is thus easier to investigate. No trace of fibrils typical of the
Distribution of (1->4)-beta-galactans, arabinogalactan proteins, xylans and (1->3)-beta-glucans in tracheid cell walls of softwoods.
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Polysaccharides were located in the walls of normal and compression wood tracheids of Pinus radiata (radiata pine), Picea sitchensis (Sitka spruce) and Picea abies (Norway spruce) by transmission electron microscopy using immunogold labelling with monoclonal antibodies to (1-->4)-beta-galactan
Effect of methyl jasmonate on in-vitro pollen germination and tube elongation of Pinus nigra
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The purpose of the main research was to investigate the effects of methyl jasmonate (MeJA) (0.05, 0.25, 0.5, and 2.5 mM) on the pollen germination and tube elongation of Pinus nigra. Total pollen germination rate increased after MeJA treatments while the most enhancement was observed at 0.05-mM
Myosin, microtubules, and microfilaments: co-operation between cytoskeletal components during cambial cell division and secondary vascular differentiation in trees.
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The immunolocalisation of unconventional myosin VIII ('myosin') in the cells of the secondary vascular tissues of angiosperm (Populus tremula L. x P. tremuloides Michx. and Aesculus hippocastanum L.) and gymnosperm (Pinus pinea L.) trees is described for the first time and related to other
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