ブドウの無核性の遺伝

概要

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Inheritance of seedlessness in grapes was studied using 2, 577 progenies resuliting from the crosses of seeded × seeded parents and 2, 073 progenies from the crosses of seeded × seedless.<BR>The degree of seedlessness of progenies was scored as follows : 0; progenies with seed- less berries, 1; progenies with aborted or imperfect seeds, 2; progenies with normal seeds. Very few progenies with a score of 0 were obtained in the seeded × seeded crosses. The seeded × seedless crosses were divided into two groups (1) crosses which yielded seedless progenies and (2) crosses which did not yield seedless progenies. Within Group 2, 'Black Corinth', 'White Corinth' and 'Concord Seedless' which seem to carry the recessive character were used as the pollen parent. Group 1 consisted of 8 cultivars which were derived from 'Thompson Seedless' or 'Monukka'. The per cent segregation of the prog- enies in these crosses was 5.4, 41.5 and 53.1%, exhibiting score of 0, 1 and 2, respectively.<BR>We proposed a hypothesis explaining this segregation ratio as follows; the seedlessness of the cultivars derived from 'Thompson Seedless' or 'Monukka' is controlled by five dominant genes, the seeded cultivars being recessive homozygous and the seedless culti- vars being heterozygous in every locus.
園藝學會の論文