Heterosis for economic traits involving colour tinted genotypes of cotton (Gossypium hirmtum L.)

摘要

Hybrids were produced utilizing two diverse colour iinted genotypes (Arkansas green and Algerian brown). Six white linted including two high seed oil content genotypes viz., MCU 7 and Sahana were crossed in half diallel fashion and were studied for estimatig heterosis for 10 characters. The maximum relative heterosis for seed cotton yield was observed in the cross Arkansas green x SVPR 2 (79.66%). The promising hybrid MCU 12 x MCU 7 exhibited maximum heterobeltiosis (75.29%) and standard heterosis (53.50%). The cross combination SVPR 2 x MCU 12 exhibited highest significant relative heterosis (74.30%) for number of bolls per plant. The hybrid Algerian brown x Sahana recorded 54.35% heterosis over better parent And the hybrid Algerian brown x MCU 11exhibited significant heterosis (77.93%) over check variety MCU 5. While the hybrid Arkansas green x MCU 12 showed highest standard heterosis for boll weight For lint index, hybrid Arkansas green x Algerian brown registered highest (47.03%) relative heterosis per cent. The hybrid Arkansas green x MCU 5 (76.57%) exhibited high standard heterosis for seed index. Similarly, for seed oil content the hybrid SVPR 2 x Sahana exhibited 28.63% positive significant relative heterosis. The promising hybrids identified were MCU 5 x Sahana, SVPR 2 x Sahana, MCU 12 x MCU 7, Arkansas green x SVPR 2, SVPR 2 x MCU 5 and Arkansas green x Sahana and need to be exploited after multiple environment testing.