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International Journal of Applied Agricultural & Horticultural Sciences
  • 28 March, 2024
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Language : English
DOI Prefix : 10.37322
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Vol. 7 (6) : November-December 2016 issue
Green Farming Vol. 7 (6) : 1311-1314 ; November-December, 2016
Heterosis and combining ability for grain yield and physiological parameters in maize (Zea mays L.)
REKHAa1*, H.D. MOHANKUMARa2, LOKESH G.Y.b3 and NETRAVATIa4
aDepartment of Genetics & Plant Breeding, University of Agricultural & Horticultural Sciences, Shivamogga - 577 204
bDepartment of Genetics and Plant Breeding, University of Agriculture Sciences, Raichur - 584 104 (Karnataka)
Designation :  
1P.G. Student *(rekha.sl.92@gmail.com), 2Special Officer, 3Asstt. Professor,
4Ph.D. Scholar
Subject : Crop Genetics and Plant Breeding
Paper No. : P-4822
Total Pages : 4
Received : 13 February 2016
Revised accepted : 26 October 2016
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Citation :

REKHA, H.D. MOHANKUMAR, LOKESH G.Y. and NETRAVATI. 2016. Heterosis and combining ability for grain yield and physiological parameters in maize (Zea mays L.). Green Farming Vol. 7 (6) : 1311-1314 ; November-December, 2016

ABSTRACT
Forty five hybrids obtained by crossing five lines with nine testers were evaluated to study heterosis and combining ability for grain yield and physiological parameters in maize. Further, heterosis studies revealed that almost all the line x tester combinations registered significant positive heterosis over both mid and better parents for grain yield per plant. The crosses namely 18838x18850, 18838x18627, 18495x18337, 18838x18342 and 18495x18494 recorded high mean performance, higher level of significant relative heterosis and heterobeltiosis and standard heterosis over check GA-105 for grain yield per plant and physiological parameters. Combining ability analysis suggested the preponderance of non-additive type of gene action for majority of the traits viz., leaf area at 90 days after sowing, leaf area index, chlorophyll content, specific leaf weight and grain yield per plant. Out of five lines 18704, 18832 and 18838 were recorded significant general combining ability effects in desirable direction for majority of the traits except number of rows per cob; while the tester, 18328, 18337, 18342, 18627 and 18850 recorded significant general combining ability effect. Among the forty-five hybrids 18838x18850 (33.363), 18838x18627 (33.948) and 18495x18337 (7.362) recorded significant SCA effect for grain yield per plant.
Key words :
Combining ability, Heterosis, Leaf area, Line x Tester analysis, Maize, Nonadditive gene action, SCA effect.