Flower corolla colour is an important trait for the attraction of pollinators and for the horticultural industry. Gossypium arboreum (L.) accessions from the United States Department of Agriculture germplasm collection frequently show flowers with a yellow coloured corolla. Accession PI 529731 is unique in that the flowers have a red coloured corolla. Genetic characterization of corolla pigmentation was conducted by crossing PI 529731 with two white flower accessions. Flowers with a red corolla were observed in the F₁ generations suggesting a dominant trait. Variation in corolla colour was observed for plants in the F₂ populations including dark red, red, light red, white, yellow and white with petals having red coloured margins. These data support a single dominant gene conferring the four red corolla phenotypes. The yellow corolla phenotype also supported a single dominant gene model. Dominant alleles at both loci are required for expression of the PI 529731 phenotype and data support a two gene model with a 9:3:3:1 segregation ratio. These data are useful for the characterization of genetic mechanisms controlling tissue‐specific pigmentation.

中文翻译：

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棉树种红色花冠表型的遗传表征PI 529731

花冠的颜色是吸引传粉媒介和园艺业的重要特征。来自美国农业部种质资源收藏的棉（Gossypium arboreum（L.））品种经常显示出带有黄色花冠的花。品种PI 529731的独特之处在于花朵具有红色的花冠。通过将PI 529731与两个白花品种杂交来进行花冠色素沉着的遗传表征。在F ₁代中观察到带有红色花冠的花，表明具有显性性状。在F _2中观察到了花冠颜色的变化种群包括深红色，红色，浅红色，白色，黄色和白色，花瓣边缘有红色。这些数据支持赋予四个红色花冠表型的单一显性基因。黄色的花冠表型也支持单个显性基因模型。PI 529731表型的表达需要两个基因座上的优势等位基因，并且数据支持具有9：3：3：1分离比的两个基因模型。这些数据可用于表征控制组织特异性色素沉着的遗传机制。