Identification of quantitative trait loci governing early germination and seedling vigor traits related to weed competitive ability in rice.

Autor: Dimaano NGB; University of the Philippines Los Baños, 4031 Los Baños, Laguna Philippines., Ali J; Rice Breeding Platform, International Rice Research Institute (IRRI), 4031 Los Baños, Laguna Philippines., Mahender A; Rice Breeding Platform, International Rice Research Institute (IRRI), 4031 Los Baños, Laguna Philippines., Sta Cruz PC; University of the Philippines Los Baños, 4031 Los Baños, Laguna Philippines., Baltazar AM; University of the Philippines Los Baños, 4031 Los Baños, Laguna Philippines., Diaz MGQ; University of the Philippines Los Baños, 4031 Los Baños, Laguna Philippines., Pang YL; State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Taian, 271018 People's Republic of China., Acero BL Jr; Rice Breeding Platform, International Rice Research Institute (IRRI), 4031 Los Baños, Laguna Philippines., Li Z; National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081 People's Republic of China.
Jazyk: angličtina
Zdroj: Euphytica: Netherlands journal of plant breeding [Euphytica] 2020; Vol. 216 (10), pp. 159. Date of Electronic Publication: 2020 Sep 19.
DOI: 10.1007/s10681-020-02694-8
Abstrakt: Weed competitive ability (WCA) is vital for the improvement of grain yield under direct-seeded and aerobic rice ecosystems where weeds are a major limiting factor. Early seed germination (ESG) and early seedling vigor (ESV) are the crucial traits for WCA. This study attempted to map the quantitative trait loci (QTLs) and hotspot regions governing ESG and ESV traits. A total of 167 BC 1 F 5 selective introgression lines developed from an early backcross population involving Weed Tolerant Rice 1 (WTR-1) as the recipient parent and Y-134 as the donor parent were phenotyped for ESG and ESV traits. Analysis of variance revealed significant differences in ESG-related traits except for root length and in ESV-related traits except for plant height at 7 days after sowing. A total of 677-high quality single nucleotide polymorphism (SNP) markers were used to analyze the marker-trait association from a 6 K SNP genotyping array. Forty-three QTLs were identified on all chromosomes, except on chromosomes 4 and 8. Thirty QTLs were contributed by a desirable allele from Y-134, whereas 13 QTLs were from WTR-1. Twenty-eight of the identified genetic loci associated with ESG and ESV traits were novel. Two QTL hotspot regions were mapped on chromosomes 11 and 12. The genomic regions of QTL hotspots were fine-tuned and a total of 13 putative candidate genes were discovered on chromosomes 11 and 12 collectively. The mapped QTLs will be useful in advancing the marker aided-selection schemes and breeding programs for the development of rice cultivars with WCA traits.
Competing Interests: Conflict of interestThe authors declare that they have no conflict of interest.
(© The Author(s) 2020.)
Databáze: MEDLINE
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