Indian Society of Genetics & Plant Breeding
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.
Keywords: Gossypium hirsutum, Amrasca devastans, jassid injury index, genetic studies, insect resistance
Year: 2005
Volume: 65
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
R. Pushpam and T. S. Raveendran info_circle
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