Flower Variegation in Sweet Pea (<i>Lathyrus odoratus</i> L.) Is Regulated by a Single Recessive Gene That Is Epistatically and Recessively Suppressed by a Pigmentation Gene

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  • Yagishita Yoshimi
    Graduate School of Life and Environmental Science, University of Tsukuba Kanagawa Agricultural Technology Center
  • Hara Yasuhide
    Kanagawa Agricultural Technology Center
  • Nakayama Masayoshi
    Graduate School of Life and Environmental Science, University of Tsukuba NARO Institute of Floricultural Science

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Other Title
  • スイートピーの花の斑入り形質の発現は着色遺伝子によって劣性上位で抑制される1つの劣性遺伝子に制御される
  • スイートピー ノ ハナ ノ フイリ ケイシツ ノ ハツゲン ワ チャクショク イデンシ ニ ヨッテ レッセイ ジョウイ デ ヨクセイ サレル 1ツ ノ レッセイ イデンシ ニ セイギョ サレル
  • Flower Variegation in Sweet Pea (Lathyrus odoratus L.) Is Regulated by a Single Recessive Gene That Is Epistatically and Recessively Suppressed by a Pigmentation Gene

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Abstract

In sweet pea cultivars, a day-neutral winter-flowering type, which is cultivated for cut flowers in greenhouses in Japan, shows less phenotypic variety than a long-day summer-flowering type, which is cultivated in Europe. We would like to introduce the variegated-flower phenotype, which is currently found only in the summer-flowering type cultivars, into winter-flowering plants so as to expand the phenotypic diversity of the winter-flowering plant type. As the first step, we examined the inheritance of the variegated-flower phenotype and its possible linkage with pigmentation and flowering-type phenotypes. The segregation ratios of flower pigmentation phenotypes in progenies of crosses between variegated, fully pigmented, and white-flowered plants revealed that the variegated-flower phenotype is regulated by a single recessive gene, and the phenotype is epistatically and recessively suppressed by a pigmentation gene. We confirmed that the winter-flowering type predominant in Japan is regulated by a single recessive gene, as previously reported. Our data also indicate that the genes controlling the variegation, pigmentation, and flowering type segregate independently. These findings suggest that the winter-flowering phenotype can be fixed in the generation in which the phenotype appears, whereas the variegated-flower phenotype can be fixed at the generation in which the white-flowered phenotype does not appear in the self-progeny.<br>

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