منابع مشابه
Sieve Tubes in Action
A method was designed for in vivo observation of sieve element/companion complexes by using confocal laser scanning microscopy. A leaf attached to an intact fava bean plant was mounted upside down on the stage of a confocal microscope. Two shallow paradermal cortical cuts were made in the major vein. The basal cortical window allowed us to observe the phloem intact. The apical window at 3 cm fr...
متن کاملSEORious business: structural proteins in sieve tubes and their involvement in sieve element occlusion.
The phloem provides a network of sieve tubes for long-distance translocation of photosynthates. For over a century, structural proteins in sieve tubes have presented a conundrum since they presumably increase the hydraulic resistance of the tubes while no potential function other than sieve tube or wound sealing in the case of injury has been suggested. Here we summarize and critically evaluate...
متن کاملReversible calcium-regulated stopcocks in legume sieve tubes.
Sieve tubes of legumes (Fabaceae) contain characteristic P-protein crystalloids with controversial function. We studied their behavior by conventional light, electron, and confocal laser scanning microscopy. In situ, crystalloids are able to undergo rapid (<1 sec) and reversible conversions from the condensed resting state into a dispersed state, in which they occlude the sieve tubes. Crystallo...
متن کاملA calcium-regulated gatekeeper in phloem sieve tubes.
The phloem is a highly specialized long distance transport tissue in vascular plants. Despite detailed knowledge of the development and ultrastructure of phloem tissue in a wide variety of plant species, surprisingly little is known about the mechanisms and regulation of phloem transport. The main function of the phloem is transport of the immediate products of photosynthesis (e.g., sugars) fro...
متن کاملSieve tube unloading and post-phloem transport of fluorescent tracers and proteins injected into sieve tubes via severed aphid stylets.
A variety of fluorescent tracers and proteins were injected via severed aphid stylets into the sieve tubes of wheat (Triticum aestivum L.) grains to evaluate the dimensions of plasmodesmal channels involved in sieve element/companion cell (SE/CC) unloading and post-phloem transport. In the post-phloem pathway, where diffusion is the predominant mode of transport, the largest molecule to show mo...
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ژورنال
عنوان ژورنال: The Plant Cell
سال: 1998
ISSN: 1040-4651,1532-298X
DOI: 10.1105/tpc.10.1.35