Genetics of the fuzzless ovule phenotype of Gossypium arboreum accession PI 615733 (cv. Zi-Hua Guang Zi)

Abstract Lint and fuzz are the two types of fiber that develop on cotton seeds. Lint is an economically important fiber used in the textile industry. Fuzz fibers remain attached to seeds, and reducing the amount of fuzz could improve ginning efficiency. The Gossypium arboreum accession PI 615733 from the United States Department of Agriculture cotton germplasm collection showed the fuzzless trait, where no fuzz fibers were observed on seeds. Accession PI 615733 was crossed with the fuzzy seeded G. arboreum accession PI 529729 to develop an F2 population. Seeds from F1 plants showed no fuzz fiber. For the F2 population of 409 plants, 239 plants were classified as fuzzless and 170 were classified as fuzzy. These data support a two-gene model with incomplete dominance. A greater understanding of the genetic mechanisms controlling fiber development on cotton seeds could contribute to breeding efforts to improve lint fiber yields and quality.

摘要 棉籽表面发育的纤维主要分为两类：绒纤维（lint）与短绒纤维（fuzz）。其中绒纤维是纺织工业中具有重要经济价值的纤维原料；短绒纤维则会附着在棉籽表面，降低其含量可有效提升轧棉效率。来自美国农业部（United States Department of Agriculture）棉花种质资源库的树棉（Gossypium arboreum）种质材料PI 615733具有无短绒性状，其棉籽表面未观察到短绒纤维。将该种质材料PI 615733与结籽带有短绒的树棉种质PI 529729杂交，构建了F2分离群体。F1代植株所结棉籽均未表现出短绒纤维。该F2群体共包含409个单株，其中239株表现为无短绒性状，170株表现为有短绒性状，上述遗传分离数据符合两对基因的不完全显性遗传模型。深入解析棉籽纤维发育的遗传机制，可为提升绒纤维产量与品质的棉花育种工作提供理论支撑。