Abstract
Plant height (PH) is one of the most important agronomic traits determining plant architecture in rice. To investigate the genetic basis of plant height in the high-yielding hybrid rice variety Nei2You No.6, recombinant inbred sister lines (RISLs) were used to map quantitative trait loci (QTL) over four years. A total of 19 minor/medium-effect QTLs were mapped on eleven chromosomes except chromosome 10, totally explaining 44.61–51.15% phenotypic variance in four environments. Among these, qPH-1a, qPH-1b, qPH-2b, qPH-3b, qPH-6, and qPH-7b were repeatedly detected over four years. Among these, the qPH-6 was mapped to an interval of 22.11–29.41 Mb on chromosome 6L, which showed the highest phenotypic variation explained (PVE) of 10.22–14.05% and additive effect of 3.45–4.63. Subsequently, evaluation of near isogenic lines (NILs) showed that the qPH-6 allele from the restorer line (R8006) could positively regulate plant height, resulting in an 18.50% increase in grain yield. These results offered a basis for further mapping of qPH-6 and molecular breeding in improving plant architecture in rice.
Highlights
As a staple food feeding over half of the world’s population, rice (Oryza sativa L.)plays a vital role in food security in rice-growing countries, especially in Asia [1]
Wide variations and transgressive segregation were found in the recombinant inbred sister lines (RISLs) for plant height in all four years (Figure 2, Table 1)
Over four years, with the skewness from −1 to 1, the plant height showed normal distribution in the RISLs (Figure 2). These results suggested that the plant height in Nei2You No.6 was genetically controlled by quantitative trait loci
Summary
As a staple food feeding over half of the world’s population, rice (Oryza sativa L.). Plays a vital role in food security in rice-growing countries, especially in Asia [1]. Rice yield is composed of biomass and harvest index. The “Green Revolution” led to a huge increase in rice yield by reducing plant height and enhancing harvest index in the 1950s. As the potential of the harvest index is exhausted (approximately 54.5%), increasing biomass is becoming the principal strategy to further improve rice yield [3]. The breeding of super rice is the latest trend in enhancing plant height and is becoming one of the main strategies in improving rice yield [4]. It is of great significance to investigate plant height genes for rice breeding
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