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Plant Signal Behav. 2008 Oct;3(10):858-61.

Plant- and stimulus-specific variations in remote-controlled sieve-tube occlusion.

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1
Plant Cell Biology Research Group; Institute of General Botany; Justus-Liebig-University; Giessen Germany.

Abstract

Phloem injury triggers local sieve-plate occlusion including callose-mediated constriction and protein plugging of sieve pores. In intact plants, reversible sieve-plate occlusion is induced by electric potential waves (EPWs)-accompanied by Ca(2+)-influx-as result of distant burning. Here, we present additional results which pertain to (a) the variability of EPW-profiles in relation to forisome conformation in intact Vicia faba plants and (b) the differential occlusion reactions to burning and cutting in various plant species. A correlation between stimulus perception and mode of phloem loading is discussed.

KEYWORDS:

callose; electrical potential waves; forisome; membrane potential; phloem transport; sieve-element occlusion; wound potentials

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