Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810029819
Authors: Dhananjay Nagannanavar
Advisor: Dr. N. G. Hanamaratti
Title: GENETIC STUDY OF ROOT TRAITS IN DROUGHT TOLERANT GENOTYPES AND STABILTY ANALYSIS IN RAINFED RICE (Oryza sativa L.)
Publisher: University Library, UAS, Dharwad.
Language: en_US
Type: Thesis
Agrotags: null
Keywords: GENETIC STUDY OF ROOT TRAITS IN DROUGHT TOLERANT GENOTYPES AND STABILTY ANALYSIS IN RAINFED RICE (Oryza sativa L.)
Abstract: Rice (Oryza sativa L.) is one of the most important crops providing staple food for a large segment of the world population. Drought stress is a major limitation to rice yields and its stability in rainfed area is seldom observed. Present study was undertaken to evaluate 74 rice genotypes for assessing genetic variability for root and shoot traits conferring drought tolerance and assess stability of genotypes for productivity under rainfed condition. ANOVA revealed highly significant difference for all the characters. Higher phenotypic and genotypic coefficient of variability for root length, shoot length, number of tillers and leaf area were recorded with high heritability and genetic advance under moisture stress condition. Root length showed positive and significant association with shoot length, root fresh weight, shoot fresh weight, root dry weight, shoot dry weight, plant height, leaf area, root to shoot ratio and SPAD value. Grain yield exhibited positive and significant association with root length, root fresh weight, root dry weight root to shoot ratio, number of tillers per meter row, number of productive tillers and per cent spikelet fertility. Assessment of the stability for grain yield of 74 genotypes using the Additive Main Effect and Multiplicative Interaction (AMMI) statistical model indicated that the effects of genotypes, environments and Genotype X Environment were significant (P<0.05) for the grain yield. The AMMI model identified BIL-188, RF53-102-3, BD-148 as superior with higher grain yield and PCA score near zero (stable). BIL-149 and Hakkalasali are most stable genotypes for the grain yield across three environments. Genotypes with better root system and stable can be used as donors for root traits in breeding programs for drought tolerance.
Subject: Genetics and Plant Breeding
Theme: GENETIC STUDY OF ROOT TRAITS IN DROUGHT TOLERANT GENOTYPES AND STABILTY ANALYSIS IN RAINFED RICE (Oryza sativa L.)
These Type: M.Sc
Issue Date: 2014-07-01
Appears in Collections:Thesis

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