Successful boll development after ovary damage during emasculation of Upland cotton flowers

2020

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.

Genetic characterization of the red coloured corolla phenotype for Gossypium arboreum accession PI 529731

2020

Genetic evaluation of the brown fibre phenotype for Gossypium arboreum accession PI 615733

2021

Cotton (Gossypium spp.) is produced in more than 70 countries with China, India, United States and Pakistan accounting for more than 70% of worldwide production (https://apps.fas.usda.gov/psdon line/ app/index.html#/app/downl oads). The presence of fibre on seeds is a common characteristic within the genus Gossypium, including the four species (Gossypium hirsutum L., Gossypium barbadense L., Gossypium arboreum L. and Gossypium herbaceum L.) from this genus that have been domesticated for the production of spinnable fibre

Genetic characterization of the brown lint phenotype for desi cotton (Gossypium arboreum) accession PI 408765 (cv. ‘Sanguineum‐1’)

2021

Cotton fibre can show a range in brown colouration, and these coloured lint fibres can be used for textile production reducing the environmental and human health hazards associated with synthetic dyes; however, coloured cotton cultivars have lower yield potential and reduced lint quality. A greater understanding of the genetics of lint colouration would be useful for the development of improved cultivars. Gossypium arboreum L. accession PI 408765 (cv. ‘Sanguineum‐1’) having the brown lint phenotype was identified from the United States Department Agriculture, National Plant Germplasm System cotton collection and crossed with G. arboreum accessions PI 529729 (cv. ‘Garo Hill’) having white lint and with PI 615733 (cv. ‘Zi‐Hua Guang Zi’) having brown lint. Lint colour data from the F2 populations support a single incomplete dominant gene model for the brown lint phenotype. Additionally, the brown lint phenotypes for PI 408765 and PI 615733 are controlled by two independent genes. Plants in these populations showed a range of brown lint colouration, and these data would be useful to further characterize the mechanisms controlling brown lint development.