Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810059450
Authors: PRAVEEN KUMAR
Advisor: Dr. O. SRIDEVI
Title: BREEDING INVESTIGATIONS FOR IMPROVING DROUGHT TOLERANCE IN MAIZE (Zea mays L.)
Publisher: University of Agricultural Sciences Dharwad
Language: en
Type: Thesis
Pages: 251
Agrotags: null
Keywords: BREEDING INVESTIGATIONS FOR IMPROVING DROUGHT TOLERANCE IN MAIZE (Zea mays L.)
Abstract: An investigation was carried out at AC, Dharwad to isolate inbred lines and develop single cross hybrids tolerant to drought by studying combining ability and heterosis with respect to yield and drought tolerance traits and to assess the stability of hybrids. 200 S2 inbred lines and 80 S3 inbred lines developed from two top cross hybrids (ParbhatxCI4 and NAC6002xCI4), four three-way crossed hybrids (All-RounderxHS-17, NK6240xCI4, NK6240xHS-17 and RajkumarxCML446), one composite x composite crossed hybrid (G57xNAC6002) were evaluated under stress and non stress situations. The analysis of variance revealed presence of significant differences for all physiological and yield related traits. 30 inbred lines selected from S3 progenies based on yield (mean+1SD) and less ASI (mean-1SD) were crossed with 5 testers and resulting 150 hybrids were evaluated along with parents and checks under stress and non stress situations during summer 2013-14. The analysis of combining ability revealed that SCA variance was higher than GCA indicating predominance of non-additive gene action in controlling majority of the traits under non stress situation and under stress situation all traits. Out of 30 inbred lines, Rajkumar×CML446 line37 and NK6240×CI4 line24 under non stress situation were found good general combiners for chlorophyll content at 90 DAS, cob girth, number of kernels/row and grain yield kg/ha, Rajkumar×CML446 line18 was found to be good general combiner for chlorophyll content at 90 DAS, cob length, number of kernels/row and grain yield kg/ha. Under stress situation, the hybrids viz., (Rajkumar×CML446 line18)×HS7, (Rajkumar×CML446 line46)×HS4, (Allrounder× HS17 line34)×HS7, (NK6240×HS17 line14)×HS7 and (Allrounder×HS17 line45)× HS10 recorded significant superiority for grain yield kg/ha over best checks NK-6240 and Rajkumar. The hybrid viz., (Allrounder×HS17 line 34)×HS7 recorded significant superiority for grain yield kg/ha over the best checks under both situations. The single cross hybrids viz., HS-15×HS-17, KDMI-15×NEI-9202B and CI-4×HS-4 were identified as stable under stress, non-stress and under rain fed situations respectively.
Subject: Genetics and Plant Breeding
Theme: BREEDING INVESTIGATIONS FOR IMPROVING DROUGHT TOLERANCE IN MAIZE (Zea mays L.)
These Type: Ph.D
Issue Date: 2015-03
Appears in Collections:Thesis

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