By Prof. Dr. Lorin W. Roberts, Prof. Dr. Peter B. Gahan, Prof. Dr. Roni Aloni (auth.)
The most aim of the publication is to supply an updated exam of the potential roles of plant hormones in the course of the cytodifferentiation of xylem and phloem parts in larger vegetation. numerous points of vascular differentiation, as phone choice, phone cycle job, and the biochemical occasions in xylogenesis, are analyzed. moreover, the newest details at the roles of auxins, cytokinins, gibberellins, ethylene, and abscisic acid in the course of vascular telephone formation are summarized. A theoretical dialogue of the six-point speculation and the vascular variation speculation is integrated. The experimental induction of vascular differentiation lower than tissue tradition stipulations is severely appraised and a concluding bankruptcy covers the interactions among actual components, development regulators, and differentiation.
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Additional resources for Vascular Differentiation and Plant Growth Regulators
Sample text
1). Other workers have shown that calcium salts have a modifying effect on each of the five groups of plant hormones (Poovaiah and Leopold 1976a, b, Leopold 1977). The importance of calcium in the regulation of plant development has been reviewed (Hepler and Wayne 1985). What evidence links calcium with vascular differentiation? 1. Comparison of the IC so values for trifluoperazine and tetracaine in a number of plant hormone- and red light-stimulated biological systems. (Elliott et al. 1983) Biological system TFP JlM Red light-dependent betacyanin synthesis Cytokinin-dependent soybean callus growth Cytokinin-dependent betacyanin synthesis in Amaranthus half-seedlings Cytokinin-dependent cotyledon growth Cytokinin-dependent betacyanin synthesis in Amaranthus cotyledons Auxin-dependent coleoptile growth in the absence of sucrose Auxin-dependent coleoptile growth in the presence of sucrose GA3-dependent IX-amylase induction (Triton X-l00 extracted) 70 70 150 50 150 50 25 400 TC JlM 300 500 600 ND a ND 800 600 1000 ND, not determined.
Experimental evidence supports the hypothesis that auxin-induced cell elongation requires calmodulin. Calmodulinbinding compounds were highly effective in blocking auxin-dependent wheat (Triticum aestivum) coleoptile growth (Elliott et al. 1983) and auxin-induced elongation of oat (Avena sativa) coleoptile segments (Raghothama et al. 1985). Other workers have found that the induction of xylogenesis in cultured explants of Lactuca also requires calmodulin (Roberts and Baba 1987). The calmodulinbinding drugs trifluoperazine and chlorpromazine completely blocked auxin-induced xylogenesis, although callus formation was only slightly inhibited under the same cultural conditions.
1983) and auxin-induced elongation of oat (Avena sativa) coleoptile segments (Raghothama et al. 1985). Other workers have found that the induction of xylogenesis in cultured explants of Lactuca also requires calmodulin (Roberts and Baba 1987). The calmodulinbinding drugs trifluoperazine and chlorpromazine completely blocked auxin-induced xylogenesis, although callus formation was only slightly inhibited under the same cultural conditions. Chlorpromazine sulfoxide, an analog of chlorpromazine that is ineffective in blocking calmodulin, did not inhibit xylogenesis.
