Mobilisation and distribution of starch and total N in two grapevine cultivars differing in their susceptibility to shedding

Functional Plant Biology : FPB
Christophe ZapataChristian Magné

Abstract

As a part of a project aimed at elucidating the causal relationship between reserve mobilisation and the extent of shedding in Vitis vinifera L., we compared storage and fate of carbon (C) and nitrogen (N) reserves in two varieties differing in their susceptibility to fruitlet abscission. Merlot (susceptible) and Pinot Noir (P. Noir, not susceptible) vines were grown in trenches under semi-controlled conditions over a 3-y period after planting. Mobilisation of stored C and N, distribution of reserve materials within the vines and 15N uptake were followed particularly during the spring growth flush and floral development in the third year. At dormancy, starch levels in the perennial tissues (roots, trunk, canes) were higher in Merlot than in P. Noir. During the spring growth flush, starch level decreased markedly in the roots of both cultivars until early bloom. At that time, starch started to accumulate in P. Noir but not in Merlot. Similar variations were found with total N. Accordingly, 15N analysis showed that translocation of storage N to the annual tissues was nearly achieved at early bloom in P. Noir while it continued until pea berry size in Merlot. In parallel, N uptake increased during the spring growth flush, and it w...Continue Reading

References

Jul 28, 2001·Physiologia Plantarum·Donald Jean, Line Lapointe
Oct 27, 2004·Journal of Plant Physiology·Christophe ZapataChristian Magné

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Citations

May 30, 2008·Journal of Experimental Botany·G LebonC Clément
May 13, 2011·Journal of Experimental Botany·Nathalie Vaillant-GaveauFlorence Fontaine

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