STUDIES ON COMBINING ABILITY, GENE ACTION AND HETEROSIS IN Bauhinia variegata L.
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Date
2019-03
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation entitled “Studies on combining ability, gene action and heterosis in
Bauhinia variegata L” was carried out in the Department of Tree Improvement and Genetic Resources,
Dr Y. S. Parmar University of Horticulture and Forestry Nauni, Solan (H.P.) during 2016-2018. Plant
material of 10 genotypes involving 6 female (P3,P8,P16,P24,P27and P32) and 4 male (P12,P13,P14 and
P17) were taken from the already raised progeny trial of the species and control crossed using Line x
Tester (6 x 4 factorial) mating design. Seedlings of control crosses were raised in the nursery in RBD
and were evaluated for morphological and growth characters. Per cent successful cross was highest in
P32 × P17 (62.50 %) and minimum in P8 × P13 (13.33 %). Maximum number of seeds per pod (9.97)
was recorded in cross P 16 × P 12. Maximum germination percentage (94.12) in cross P3 x P12 and
survival percentage (96.30) in P16 × P13 was recorded. Line x tester analysis for combining ability
revealed that lineP16followed byP32,P27and P3and testerP17 followed byP14were found to be good
general combiners. On the basis of heterosis over better parent, mean performance and significant
desirable SCA effects for morphological and growth characters, the combinations P16 × P14,P32×P17
and P3 × P17were found to be the most promising families. The estimates of SCA variance (δ2SCA)
were more than the GCA variance (δ2GCA) for most of the characters except forcollar diameter and
number of branches. The gene action study revealed the importance of both additive as well as
non-additive gene effects in the inheritance with preponderance of non-additive gene action.
The proportional contribution of lines was higher than individual contribution of testers or line
× tester interaction except for plant height, leaf area, internodal length, root fresh weight and
root dryweight. Out of 25 RAPD primers fiveprimers weresuccessful in verifying hybridity.
Signature of the Student Signature of Major Advisor
(Tesfaye Ashine) (Dr. IK Thakur)
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