AI Article Synopsis
- To enhance rice yields in direct seeded conditions, it’s important to develop rice varieties with strong weed competitiveness, which involves studying traits at both the physical and genetic levels.
- Researchers identified 72 quantitative trait loci (QTLs) linked to 33 weed competitive traits in a population derived from O. glaberrima and O. sativa, revealing significant genetic variation and additive gene action.
- Among the significant findings, 59 major QTLs were linked to important traits, with many favorable alleles coming from the O. glaberrima parent, highlighting its potential as a source for breeding more competitive rice varieties.
Article Abstract
To improve grain yield under direct seeded and aerobic conditions, weed competitive ability of a rice genotype is a key desirable trait. Hence, understanding and dissecting weed competitive associated traits at both morphological and molecular level is important in developing weed competitive varieties. In the present investigation, the QTLs associated with weed competitive traits were identified in BCF population derived from weed competitive accession of O. glaberrima (IRGC105187) and O. sativa cultivar IR64. The mapping population consisting of 144 segregating lines were phenotyped for 33 weed competitive associated traits under direct seeded condition. Genetic analysis of weed competitive traits carried out in BCF population showed significant variation for the weed competitive traits and predominance of additive gene action. The population was genotyped with 81 genome wide SSR markers and a linkage map covering 1423 cM was constructed. Composite interval mapping analysis identified 72 QTLs linked to 33 weed competitive traits which were spread on the 11 chromosomes. Among 72 QTLs, 59 were found to be major QTLs (> 10% PVE). Of the 59 major QTLs, 38 had favourable allele contributed from the O. glaberrima parent. We also observed nine QTL hotspots for weed competitive traits (qWCA2a, qWCA2b, qWCA2c, qWCA3, qWCA5, qWCA7, qWCA8, qWCA9, and qWCA10) wherein several QTLs co-localised. Our study demonstrates O. glaberrima species as potential source for improvement for weed competitive traits in rice and identified QTLs hotspots associated with weed competitive traits.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7744529 | PMC |
| http://dx.doi.org/10.1038/s41598-020-78675-7 | DOI Listing |
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