Articles
INHERITANCE OF SEEDLESSNESS IN SOME CROSSBRED FAMILIES IN VITIS VINIFERA L. AND PRACTICAL RESULTS OF A BREEDING PROGRAMME
Article number
528_92
Pages
621 – 626
Language
Abstract
Observations were made by examining 12 F1 families for a total of 1196 individual plants.
From the study of the progeny a predominant situation emerges for the different F1 related to a simple genetic system common to the various cross combinations.
The segregation data can be explained by assuming the existence of two genes that, when both homozygous in the recessive form, determine the inability to completely develop the seed structures.
With reference to the materials under study, the results have also shown that: (1) in a selection programme for seedlessness, a fairly high frequency of seedless plants can be expected from crossing normal x seedless varieties; this frequency could be increased (50% of the F1) if seed parents are identified that are homozygous for one of the genes of seedlessness and only these are used in the crosses with seedless varieties; (2) among seedless genotypes, forms are found with differently developed seed structure; in most cases, the level of growth of the seed itself is a constant characteristic of the plant.
Lastly the main characteristics are reported of three new seedless vines (‘Paula’, ‘Rubinia’, ‘Helena’), which have been obtained from this programme.
From the study of the progeny a predominant situation emerges for the different F1 related to a simple genetic system common to the various cross combinations.
The segregation data can be explained by assuming the existence of two genes that, when both homozygous in the recessive form, determine the inability to completely develop the seed structures.
With reference to the materials under study, the results have also shown that: (1) in a selection programme for seedlessness, a fairly high frequency of seedless plants can be expected from crossing normal x seedless varieties; this frequency could be increased (50% of the F1) if seed parents are identified that are homozygous for one of the genes of seedlessness and only these are used in the crosses with seedless varieties; (2) among seedless genotypes, forms are found with differently developed seed structure; in most cases, the level of growth of the seed itself is a constant characteristic of the plant.
Lastly the main characteristics are reported of three new seedless vines (‘Paula’, ‘Rubinia’, ‘Helena’), which have been obtained from this programme.
Authors
C. Lorenzoni, S. Cancellier, A. Costacurta, A. Calò
Keywords
seedlessness, inheritance, breeding, new varieties
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