Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810029801
Authors: Shadakshari T. V.
Advisor: Dr. G. Shanthakumar
Title: GENETIC ANALYSIS OF DROUGHT TOLERANCE IN MAIZE (Zea mays L.)
Publisher: University of Agricultural Sciences, Dharwad
Language: en_US
Type: Thesis
Agrotags: null
Keywords: GENETIC ANALYSIS OF DROUGHT TOLERANCE IN MAIZE (Zea mays L.)
Abstract: The investigation was carried out to elucidate the genetic mechanisms underlying the drought tolerance in maize. One hundred inbred lines were evaluated for drought tolerance under field condition by withholding water before fifteen days of anthesis and silking. Fifteen drought tolerant inbred lines viz., DMIL 101, DMIL103, DMIL112, DMIL117, DMIL122, DMIL125, DMIL129, DMIL130, DMIL136, DMIL140, DMIL145, DMIL147, DMIL150, DMIL152 and DMIL160 were identified based on the genetic diversity and morpho-physiological traits under water stress condition. Further, these inbred lines were confirmed by molecular characterization using SSR loci linked to candidate genes responsible drought tolerance and root screening studies. Among SSR markers used, bnlg2248 produced a maximum of seven alleles followed by bnlg1866, bnlg210, mmc0181 and umc1056 tagged to hsp26, abp4, sps1 and bip1 candidate gene produced four alleles each. The inbred lines DMIL152, DMIL136 and DMIL160 exhibited superior performance for various root morphological traits under water stress condition. The fifteen inbred lines were utilized for developing 105 single crosses hybrids through half diallel mating design. These hybrids were evaluated for drought tolerance under field condition and identified the ten superior single cross hybrids viz., DMIL112 x DMIL122, DMIL101 x DMIL117, DMIL145 x DMIL152, DMIL147 x DMIL150, DMIL103 x DMIL147, DMIL117 x DMIL150, DMIL130 x DMIL152, DMIL122 x DMIL160, DMIL103 x DMIL112 and DMIL152 x DMIL160. The selected ten hybrids were evaluated for their grain yield stability along with checks at three locations viz., ARS, Hanumanamatti, MARS, Dharwad and ARS, Arabhavi under rainfed ecosystem. Among ten hybrids, DMIL103 x DMIL147 was found to be most stable. The predominance of both additive and non-additive gene action was observed in the cross DMIL270 x DMIL101 whereas, DMIL350 x DMIL112 cross exhibited predominance of non-additive gene action which were the potential source for improving the yield and its attributing traits.
Subject: Genetics and Plant Breeding
Theme: GENETIC ANALYSIS OF DROUGHT TOLERANCE IN MAIZE (Zea mays L.)
These Type: Ph.D
Issue Date: 2014-06-01
Appears in Collections:Thesis

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