Artificial screening and inheritance studies on resistance to jassid (Amrasca devastans) in Gossypium hirsutum L.

Abstract

Studies on artificial screening of 13 Gossypium hirsutum lines and 30 hybrids were undertaken to identify the resistant genotypes for use in breeding programmes. From this study, it was found that KC 2 was highly resistant, Stoneville, DHY 286, Khandwa 2 were resistant and MCU 7 highly susceptible. Among the 30 hybrids, most of the hybrids came under resistant category. The genotypes KC 2, DHY 286 and Khandwa 2 were resistant to jassids and can be used as donors in breeding programmes to evolve jassid resistant varieties. Artificial screening for resistance to jassid (Amrasca devastans) was done in F2 generation of fifteen crosses of upland cotton Gossypium hirsutum. The crosses KC 2 x MCU 7, KC 2 x MCU 12, Stoneville x MCU 5, Stoneville x MCU 7, Stoneville x MCU 12, DHY 286 x MCU 7, DHY 286 x MCU 12, Badnawar 1 x MCU 5, Badnawar 1 x MCU 7 segregated in the ratio of 3:1 for resistance and susceptiblity. However, the crosses KC 2 x MCU 5, DHY 286 x MCU 5 and Badnawar 1 x MCU 12, showed digenic segregation with epistasis, the actual segregation being 15:1, 9:7 and 13:3 respectively. The usefulness of the high yielding crosses, which segregated for 3:1 ratio, will pave way for selecting high yielding and jassid resistant varieties.