Molecular and Cellular Aspects of Calcium in Plant by Dieter Marmé (auth.), A. J. Trewavas (eds.)

By Dieter Marmé (auth.), A. J. Trewavas (eds.)

This quantity summarises the lecture and poster classes of a NATO complicated workshop held in Edinburgh, July 15th-19th, 1985. The workshop was once held to assemble plant scientists of many various disciplines yet who percentage a standard curiosity within the regulatory position of calcium in plant improvement. even if this quantity covers the formal lawsuits, an equivalent size of time was once dedicated to dialogue either in huge and small teams. a bit of the flavor of the instructions and personality of the discussions can be present in the ultimate article by way of David Clarkson which was once written to hide this different­ clever exposed region of the workshop. the amount displays a lot of the present pleasure within the box of plant calcium learn. some of the members are pioneers of their res­ pective components and the level to which the final 5 years has obvious a drama­ tic unfolding, an entire inversion of the function of calcium from basic macro­ nutrient to significant metabolic and developmental controller is mentioned right here. the cloth is new and lots more and plenty of it unpublished. In plant body structure, the eighties may perhaps but be unique the last decade of calcium.

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A. CNRS nO 241 118 Route de Narbonne, 31062 Toulouse Cedex INTRODUCTION It is generally accepted that the conversion of a stimulus into biological/biochemical responses involves a multistep process that includes the variation in the amounts of second messenger(s) and the transduction of the chemical message through sensing molecules (Cohen, 1982). Such a scheme, inferred from animal cell physiology has been shown to be essentially valid for plants. Thus, several lines of evidence have established that calcium controls different biochemical/biological processes which are being discussed during this workshop; especially calcium is implicitly recognized as the main second messenger in plants.

J. A. L. Eichhorn, 21Al NMR study of aluminum (III) interactions with carboxylate ligands, Inorgan. Chern. 22:525-529 (1983). 29. A. Cox, M. E. F. DeGrado, The interaction of calmodulin with amphiphilic peptides, J. Biol. Chern. 260:2527-2534 (1985). 30. N. L. Privalov, Thermodynamic study of domain organization in troponin C and calmodulin, J. Mol. Biol. 181:533-544 (1985). 31. G. Suhayda and A. Haug, Organic acids prevent aluminum-induced conformational changes in calmodulin, Biochem. Biophys.

In addition to transported metabolites, phloem sap contains cAMP, high levels of ATP, and proteins such as lectins, phosphodiesterase, and an ATPase, whose activity in other systems is often modulated by divalent cations (see Eschrich & Heyser, 1975; Sabnis and Hart, 1982). Calcium is an obvious candidate for a regulatory role in protein conformation and enzyme activity. The available evidence arguably indicates that calcium is not mobile in the phloem (see McEuen, 1979); nevertheless, it is present in the sieve tube sap (Hall, Baker and Milburn, 1971).

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