Articles
GENETIC CONTROL OF TENDRIL DISTRIBUTION IN A GRAPEVINE ROOTSTOCK HYBRID POPULATION
Article number
827_57
Pages
337 – 340
Language
English
Abstract
Grapevine tendril distribution is a characteristic of varieties and species.
Most Vitis species show a discontinuous pattern of tendrils at nodes, typically two nodes with tendrils followed by a skip node without a tendril. Vitis labrusca is extraordinary among North American grape species in that it characteristically bears tendrils continuously at successive nodes.
We examined the tendril distribution on a population of seedlings from a 161-49C x (V. labrusca x V. mustangensis) hybridization. 161-49C is a V. riparia x V. berlandieri hybrid that ordinarily bears tendrils in a discontinuous pattern.
Although the V. labrusca x V. mustangensis parent frequently demonstrates more than two tendrils in sequence, it does show nodes without tendrils and, as such, cannot be described as strictly continuous in its tendril distribution.
Tendril distribution was assessed beginning at the first node with a tendril (typically the seventh or eight node) and scored at twelve successive nodes.
The hybrid popula¬tion has seedlings that respectively belong to multiple classes of tendril distribution, including discontinuous (eight tendrils in 12 nodes), three tendrils at successive nodes, and four tendrils at successive nodes.
Nearly a quarter of the seedlings from the hybrid population demonstrated strictly continuous tendril distribution (no tendrils without nodes observed on the primary shoot). Even though the seedling population analyzed is essentially only one-quarter V. labrusca, there were still individuals that showed the continuous tendril distribution that is characteristic of V. labrusca. This apparent transgressive segregation implies qualitative inheritance of tendril patterning, substantial environmental influence on tendril patterning, or both.
Most Vitis species show a discontinuous pattern of tendrils at nodes, typically two nodes with tendrils followed by a skip node without a tendril. Vitis labrusca is extraordinary among North American grape species in that it characteristically bears tendrils continuously at successive nodes.
We examined the tendril distribution on a population of seedlings from a 161-49C x (V. labrusca x V. mustangensis) hybridization. 161-49C is a V. riparia x V. berlandieri hybrid that ordinarily bears tendrils in a discontinuous pattern.
Although the V. labrusca x V. mustangensis parent frequently demonstrates more than two tendrils in sequence, it does show nodes without tendrils and, as such, cannot be described as strictly continuous in its tendril distribution.
Tendril distribution was assessed beginning at the first node with a tendril (typically the seventh or eight node) and scored at twelve successive nodes.
The hybrid popula¬tion has seedlings that respectively belong to multiple classes of tendril distribution, including discontinuous (eight tendrils in 12 nodes), three tendrils at successive nodes, and four tendrils at successive nodes.
Nearly a quarter of the seedlings from the hybrid population demonstrated strictly continuous tendril distribution (no tendrils without nodes observed on the primary shoot). Even though the seedling population analyzed is essentially only one-quarter V. labrusca, there were still individuals that showed the continuous tendril distribution that is characteristic of V. labrusca. This apparent transgressive segregation implies qualitative inheritance of tendril patterning, substantial environmental influence on tendril patterning, or both.
Authors
P. Cousins, D. Johnston, S. Switras-Meyer , C. Meyer
Keywords
phyllotactic, patterning
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