Parental Diversity and Earliness-Seed-Lint Index of Twelve Cotton (Gossypium hirsutum L.) Genotypes

Document Type : Original Article

Authors

1 Genetics and Plant Breeding Dept, Bangabandhu Sheikh Mujibur Rahman Agric Univ, Gazipur 1706, Bangladesh

2 Soil Science Dept, Bangabandhu Sheikh Mujibur Rahman Agric Univ, Gazipur 1706, Bangladesh

3 Cotton Development Board (CDB), Tula Bhaban, Dhaka, Bangladesh

4 Genetics and Plant Breeding Dept, Bangabandhu Sheikh Mujibur Rahman Agric Univ, Gazipur 1706, Bangladesh Agricultural University, Gazipur 1706, Bangladesh

Abstract

The study aimed to assess the genetic diversity and relationships among 12 genotypes using RAPD markers. Molecular variance within and between the populations of parental genotypes accounted for 93% and 7%, respectively. The unweighted neighbor-joining tree, principal coordinate analysis, and heatmap clustered the 12 parental genotypes into three major groups. The population structure model divided the population into two groups, with parents BC-119 and RA-2 being pure. Parents BC-119 and P1(1) required the fewest days for 80% boll opening (166.97 and 168.78, respectively). Parents RA-2 and P1(1) also achieved the highest seed cotton yield per plant (68.47 g and 68.09 g, respectively). Parent BC-119 exhibited strong performance in traits including the number of secondary fruiting branches (10.64 per plant), lint index (5.46), and ginning out-turn (41.26%). The highest value of Bartlett’s earliness index was 1.11. CB-15 and CB-17 genotypes produced the highest seed index, while genotype P1(1) recorded the lowest seed index. Parents BC-119 and CB-17 yielded the highest lint index (>5.30 g), whereas P3(8) produced the lowest lint index (2.93 g). Results suggested that molecular marker data are useful in determining the diversity and relatedness of parents, which could be used to identify exceptional lines for future breeding programs. 

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