منابع مشابه
Functional sieve element protoplasts.
Sieve element (SE) protoplasts were liberated by exposing excised phloem strands of Vicia faba to cell wall-degrading enzyme mixtures. Two types of SE protoplasts were found: simple protoplasts with forisome inclusions and composite twin protoplasts-two protoplasts intermitted by a sieve plate-of which one protoplast often includes a forisome. Forisomes are giant protein inclusions of SEs in Fa...
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 کاملStructure of functional soybean sieve elements.
Soybean (Glycine max cv. Bragg) petiolar tissue containing translocated (14)C-sucrose was quick frozen, freeze-substituted in acetone or propylene oxide and embedded in Epon. This procedure allowed cytological observations on sieve elements whose functional condition could be verified by microautoradiography. Sieve elements and companion cells were essentially free of ice damage. Aside from a P...
متن کاملDoes aphid salivation affect phloem sieve element occlusion in vivo?
To protect against loss of photo-assimilate-rich phloem sap, plants have evolved several mechanisms to plug phloem sieve tubes in response to damage. In many Fabaceae, each sieve element contains a discrete proteinaceous body called a forisome, which, in response to damage, rapidly transforms from a condensed configuration that does not impede the flow of sap to a dispersed configuration that p...
متن کاملSieve element Ca2+ channels as relay stations between remote stimuli and sieve tube occlusion in Vicia faba.
Damage induces remote occlusion of sieve tubes in Vicia faba by forisome dispersion, triggered during the passage of an electropotential wave (EPW). This study addresses the role of Ca2+ channels and cytosolic Ca2+ elevation as a link between EPWs and forisome dispersion. Ca2+ channel antagonists affect the initial phase of the EPW as well as the prolonged plateau phase. Resting levels of sieve...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 2007
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.107.105940