Using a mathematical model to evaluate the trophic and non-trophic determinants of axis development in grapevine

Functional Plant Biology : FPB
Benoît PallasJ Lecoeur

Abstract

The grapevine (Vitis vinifera L.) shoot is a complex modular branching system, with one primary axis and many secondary axes organised into a repetitive structure of three successive phytomers (P0-P1-P2). P1-P2 phytomers bear one tendril or cluster, whereas P0 phytomers bear no tendrils or clusters. Axis development displays a high variability, due, partly, to trophic competition. The aim of this study was to estimate changes in trophic competition within the shoot, and to relate plasticity in axis development to changes in trophic competition. 'Grenache N.' and 'Syrah' cultivars were grown with two contrasting levels of cluster load. Organogenesis and organ mass were measured during shoot development. Changes in trophic competition were estimated, using the solver functions of the GreenLab model. Internodes and clusters were strong sinks. They affected the shoot development to the same extent, but the internodes showed an earlier effect. The cessation of development of the secondary axis was affected by trophic competition, but the primary axis continued to develop, regardless of trophic competition. Secondary axes differed in sensitivity to trophic competition as a function of two criteria: their type and their size. The most...Continue Reading

References

Mar 26, 2003·Tree Physiology·Michel GénardJocelyne Kervella
Nov 11, 2003·Trends in Plant Science·Ottoline Leyser
Jan 21, 2004·Current Opinion in Plant Biology·Sally P Ward, Ottoline Leyser
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Nov 30, 2007·Annals of Botany·Mengzhen KangPhilippe de Reffye
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Dec 1, 2008·Functional Plant Biology : FPB·Angélique ChristopheJérémie Lecœur
Oct 1, 2003·The New Phytologist·Ariel Novoplansky

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