QTLs identification for characteristics of the root system in upland rice through DNA microarray

• Autor(a) principal: Rios Terra, Thiago Gledson
• Data de Publicação: 2016
• Outros Autores: Rodrigues, Haroldo Silva, Nakano Rangel, Paulo Hideo, Tomaz, Rafael Simoes [UNESP], Cruz, Cosme Damiao, Borem, Aluizio
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.4025/actasciagron.v38i4.30534; http://hdl.handle.net/11449/159051
• topic: genomic; Oryza sativa L.; DNA chip; QTL mapping; abiotic stress

The aim of this work is the construction of a genetic map and identification of quantitative trait loci (QTLs) that control characteristics of the root system of rice. We evaluated a F-2:3 population composed of 150 families from the cross between the varieties IAC 165 x BRS Primavera. Genotyping was performed in the F-2 population using 3,742 SNP (Single Nucleotide Polymorphism) markers. The evaluation of the root system in the F-3 population was performed through a large-scale phenotyping method based on image generation with a CI-600 root scanner and on quantification through the WinRhizo (R) software. The experiment was arranged in a randomized block design with three replications performed under greenhouse. The variables analyzed were root length, root surface area and root volume at the depths of 5 to 25 cm and 25 to 45 cm. The SNP markers analysis allowed the construction of the genetic map with a full length of 1424 cM. The linkage group with the largest coverage area was number 3 with 270 cM (100 SNPs), followed by linkage group 1 with 249 cM (170 SNPs) and linkage group 2 with 163 cM (99 SNPs). The genetic analysis allowed the detection of QTLs for all the characteristics.