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Simultaneous improvement in cold tolerance and yield of temperate japonica rice ( O ryza sativa L .) by introgression breeding
Author(s) -
Meng Lijun,
Lin Xiuyun,
Wang Jinming,
Chen Kai,
Cui Yanru,
Xu Jianlong,
Li Zhikang
Publication year - 2013
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12097
Subject(s) - biology , introgression , japonica , heritability , quantitative trait locus , selection (genetic algorithm) , japonica rice , yield (engineering) , temperate climate , seedling , marker assisted selection , agronomy , microbiology and biotechnology , horticulture , genetics , botany , gene , materials science , artificial intelligence , computer science , metallurgy
To combine high yield and improved cold tolerance ( CT ) in a japonica rice variety, ‘ C haoyou1’ ( CY 1), 324 BC 2 F 5 introgression lines ( IL s) selected for CT from 11 CY 1 BC 2 F 4 populations were evaluated in replicated experiments for their CT at the reproductive and seedling stages. A mean realized heritability of 0.747 was achieved in this study for CT . Evaluation of 116 IL s from five BC populations in replicated experiments under stress and normal conditions identified 18 promising IL s that had greatly improved CT and yield compared with CY 1. Detailed comparisons between the IL s and CY 1 for CT and yield‐related traits under stress and non‐stress conditions provided useful information and better understanding of important issues such as donor selection, selection efficiency and associated changes in non‐target traits in the BC breeding process. The large numbers of CT IL s developed provide useful materials for genetic, physiological and molecular dissection of CT and yield traits using DNA markers and ‐omic tools, and as parents for further improving these traits by designed QTL pyramiding.