Genome-wide association and gene validation studies for early root vigour to improve direct seeding of rice
Autor: | Fanmiao Wang, Jérôme Cattin-Ortolá, Takuma Ishizaki, Carla Lenore F. Calumpang, Terry J. Rose, Matthias Wissuwa, Sheryl Catausan, Toshisangba Longkumer, Jeshurun A. Tarun, Tobias Kretzschmar, Juan Pariasca Tanaka |
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Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
0301 basic medicine biology Physiology Lateral root food and beverages Introgression Locus (genetics) Plant Science Quantitative trait locus biology.organism_classification 01 natural sciences 03 medical and health sciences 030104 developmental biology Agronomy Seedling Genetic marker Genetic variation Plant breeding 010606 plant biology & botany |
Zdroj: | Plant, Cell & Environment. 41:2731-2743 |
ISSN: | 0140-7791 |
Popis: | Elucidation of the genetic control of rice seedling vigour is now paramount with global shifts towards direct seeding of rice and the consequent demand for early vigour traits in breeding programmes. In a genome-wide association study using an indica-predominant diversity panel, we identified quantitative trait loci (QTLs) for root length and root number in rice seedlings. Among the identified QTLs, one QTL for lateral root number on chromosome 11, qTIPS-11, was associated with a 32.4% increase in lateral root number. The locus was validated in independent backgrounds, and a predicted glycosyl hydrolase, TIPS-11-9, was identified as the causal gene for observed phenotypic differences. TIPS-11-9 was differentially expressed in emerging lateral roots of contrasting qTIPS-11 haplotypes, which was likely due to differences in cis-regulatory elements and auxin responsiveness. Abolishment of Tips-11-9 function through T-DNA insertion in a qTIPS-11-positive background resulted in a reduction of lateral root number, which negatively affected biomass accumulation, particularly under phosphorous-limiting conditions. Marker-assisted introgression of qTIPS-11 into modern indica varieties will aid in the generation of varieties adapted to direct seeding and thus facilitate the adoption of direct seeding practices in tropical Asia. |
Databáze: | OpenAIRE |
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