Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810057050
Authors: SNEHA G. LAKKANGOUDAR
Advisor: Dr. SUMA S. BIRADAR
Title: GENETIC ENHANCEMENT FOR DURABLE LEAF RUST RESISTANCE THROUGH MARKER ASSISTED BACKCROSS BREEDING IN BREAD WHEAT (Triticum aestivum L.)
Publisher: University of Agricultural Sciences Dharwad
Language: en
Type: Thesis
Pages: 202
Agrotags: null
Keywords: GENETIC ENHANCEMENT FOR DURABLE LEAF RUST RESISTANCE THROUGH MARKER ASSISTED BACKCROSS BREEDING IN BREAD WHEAT (Triticum aestivum L.)
Abstract: The present investigation was undertaken to pyramid two effective durable leaf rust resistance genes Lr34 and Lr68 for genetic enhancement of a bread wheat variety, NIAW 1415. Parula carrying both Lr34 and Lr68 genes was used as donor for introgression of these two genes employing marker assisted backcrossing. Individual plants of BC¬1¬F2 ¬and F¬3 were confirmed for the presence of Lr34 and Lr68 using SSR and STS markers. BC¬1¬F2¬ ¬plants with Lr68, and Lr34+Lr68 genes exhibited high frequency of transgressive segregants, for most of the agronomic traits as compared to Lr34 gene alone. In F¬3¬ population, the highest transgressive segregants were recorded for the trait seeds per spike for background of Lr68 alone. Mean performance of BC1F2 generation resembled the recurrent parent NIAW 1415 with respect to traits like to early maturity and high spike length. On the contrary, for rest of the traits, NIAW 1415 was superior. In general the variability for all the traits was more in F¬3¬ generation as compared to BC1¬F¬2¬. Characterization of selected germplasm lines for slow rusting mechanisms lead to identification of new sources with different minor gene combinations viz., UP 262 (Lr34 + Lr46+ Lr68) and DBW 17 (Lr34 + Lr67 + Lr68) which were better in performance for grain yield compared to parula (Lr34 + Lr46 + Lr68) and also superior with respect to slow rusting components like pustule size, pustule density and AUDPC values. Hence, these genotypes can used as new sources for durable rust resistance breeding programmes.
Subject: Genetics and Plant Breeding
Theme: GENETIC ENHANCEMENT FOR DURABLE LEAF RUST RESISTANCE THROUGH MARKER ASSISTED BACKCROSS BREEDING IN BREAD WHEAT (Triticum aestivum L.)
These Type: M.Sc
Issue Date: 2015-06
Appears in Collections:Thesis

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