ISHS Acta Horticulturae 689: VII International Symposium on Grapevine Physiology and Biotechnology
SEGREGATION OF TENDRIL DISTRIBUTION PATTERNING IN GRAPEVINE POPULATIONS |
| Authors: | P. Cousins, S. Switras-Meyer, J. Vidmar, L. Boyden, D. Johnston |
| Keywords: | phyllotactic, continuous, intermittent, cluster, inflorescence, genetic |
| Abstract:
Variation in phyllotactic patterning of tendril and cluster distribution is recognized as a distinctive characteristic of grapevine cultivars. We examined the segregation of tendril distribution patterns in seedling populations derived from self-pollination of interspecific Vitis hybrid cultivars and from hybridization of Vitis hybrid cultivars and species. Seedlings of populations resulting from 'Early Catawba', 'Valiant', 'Delaware' and 'Missouri Riesling' controlled self-pollinations and 'Cosmo 10' × V. labrusca 'GBC2' and '161-49C' × 'Q126' controlled hybridizations were grown in a greenhouse and evaluated for tendril patterning at about twelve weeks of age. We scored the presence or absence of tendrils or equivalent accessory organs beginning at the first node bearing a tendril and continuing for a total of six successive nodes. We assigned a numerical score to each seedling according to the average number of tendrils per node. Populations differed in their tendril distribution patterns. The segregation of tendril patterning indicates the action of one or a few major genes conditioning tendril distribution patterning in grapevine. Since tendrils and clusters are developmentally related, genes influencing the distribution patterning of tendrils may also influence the number and distribution of clusters. | |
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