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Title: Genetic Investigations for Combining Heat Tolerance and Resistance to Wilt in Chickpea Cicer Arietinum L
Researcher: Vijayakumar A.G.
Guide(s): H.L. Nadaf
Keywords: Genetics
Genetics and Plant Breeding
Plant Breeding
University: University of Agricultural Sciences, Dharwad
Completed Date: 2019
Abstract: Climate change and increased cropping intensity are forcing chickpea newlinecultivation to relatively higher temperature environments. Drastic yield reduction newlineoccurs in chickpea when the crop is exposed to heat stress (gt35 ºC) during reproductive newlinephase. Cultivars tolerant to high temperatures without reduction in yield are needed for newlinesustainable chickpea production. Hence, present investigation was conducted to newlinecombine and isolate productive recombinants for heat stress and major biotic stresses newlineviz., fusarium wilt and dry root rot. newlineFive crosses JG 11 x JG 14, JAKI 9218 x JG 14, JG 16 x ICC 07110, ICC newline07118 x JSC 37 and JG 16 x ICC 07118 were evaluated for gene action under heat newlinestress. Additive-dominance model was adequate for almost all phenological traits newlineindicating additive gene action for days to first flowering, days to fifty per cent newlineflowering, days to first pod formation and days to fifty per cent pod formation. Higher newlinedegree of dominance was observed for yield and its contributing traits signifying need newlineof exploiting heterosis thorough population improvement and delayed selection to newlineisolate productive recombinants. newlineHigher GCV and PCV values were noticed in normal season vis-à-vis late sown newlineconditions. Yield per plant registered higher GCV (18.65), h2 (79.20%) and GAM newline(34.20) under heat stress, indicating larger effect of heat stress on progenies for creating newlinevariation among them. The productive recombinants were resistant to wilt under newlinenormal season (82.90 %), late sown environment (82.80%) and were found moderately newlinetolerant to dry root rot. Days to 50% flowering was positively associated with days to newline50% pod formation, number of pods per plant, days to maturity and number of seeds newlineper pod. Flowering duration is more important to help escape the adverse effects of heat newlinestress on yield. Heat tolerant progenies [(progeny 146 (Heat Susceptibility Index: -0.59) newlinefollowed by progeny 351 (HSI: 0.34) and progeny 36 (HIS: 0.37)] can be further newlineevaluated for stability of heat tolerance. newline
Pagination: iii-xiv, 1-212
Appears in Departments:Department of Genetics and Plant Breeding

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02_prelim pages.pdf73.22 kBAdobe PDFView/Open
03_table of content.pdf66.09 kBAdobe PDFView/Open
04_abstract.pdf86.91 kBAdobe PDFView/Open
05_chapter 1.pdf103.42 kBAdobe PDFView/Open
06_chapter 2.pdf417.7 kBAdobe PDFView/Open
07_chapter 3.pdf2.8 MBAdobe PDFView/Open
08_chapter 4.pdf1.03 MBAdobe PDFView/Open
09_chapter 5.pdf205.84 kBAdobe PDFView/Open
10_annexure.pdf282.93 kBAdobe PDFView/Open
80_recommendation.pdf202.85 kBAdobe PDFView/Open
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