Identification and analysis of QTLs controlling cold tolerance at the reproductive stage and validation of effective QTLs in cold-tolerant genotypes of rice (Oryza sativa L.)
| Autor: | Kshirod K. Jena, Ji-Yoon Lee, Parminder S. Virk, Y. H. Choi, J. P. Suh, J. D. Yea, David J. Mackill, Ji-Ung Jeung |
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| Rok vydání: | 2009 |
| Předmět: |
Crops
Agricultural Genetic Markers Genotype Quantitative Trait Loci Quantitative trait locus Genes Plant Japonica Inbred strain Gene mapping Stress Physiological Botany Genetics Poaceae Cultivar Plant breeding Crosses Genetic Oryza sativa biology Reproduction Chromosome Mapping food and beverages Oryza General Medicine biology.organism_classification Adaptation Physiological Cold Temperature Horticulture Phenotype Haplotypes Agronomy and Crop Science Genome Plant Biotechnology |
| Zdroj: | Theoretical and Applied Genetics. 120:985-995 |
| ISSN: | 1432-2242 0040-5752 |
| DOI: | 10.1007/s00122-009-1226-8 |
| Popis: | Low temperature or cold stress is one of the major constraints of rice production and productivity in temperate rice-growing countries and high-altitude areas in the tropics. Even though low temperature affects the rice plant in all stages of growth, the percent seed set is damaged severely by cold and this reduces the yield potential of cultivars significantly. In this study, a new source of cold-tolerant line, IR66160-121-4-4-2, was used as a donor parent with a cold-sensitive cultivar, Geumobyeo, to produce 153 F(8) recombinant inbred lines (RILs) for quantitative trait locus (QTL) analysis. QTL analysis with 175 polymorphic simple sequence repeat (SSR) markers and composite interval mapping identified three main-effect QTLs (qPSST-3, qPSST-7, and qPSST-9) on chromosomes 3, 7, and 9. The SSR markers RM569, RM1377, and RM24545 were linked to the identified QTLs for cold tolerance with respect to percent seed set using cold-water (18-19 degrees C) irrigation in the field and controlled air temperature (17 degrees C) in the greenhouse. The total phenotypic variation for cold tolerance contributed by the three QTLs was 27.4%. RILs with high percent seed set under cold stress were validated with linked DNA markers and by haplotype analysis that revealed the contribution of progenitor genomes from the tropical japonica cultivar Jimbrug (Javanica) and temperate japonica cultivar Shen-Nung89-366. Three QTLs contributed by the cold-tolerant parent were identified which showed additive effect on percent seed set under cold treatment. This study demonstrated the utility of a new phenotyping method as well as the identification of SSR markers associated with QTLs for selection of cold-tolerant genotypes to improve temperate rice production. |
| Databáze: | OpenAIRE |
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