Abstract
The abuse of fertilizer results in tall rice plants that are susceptible to lodging and reduced plant yield. Hence, it is important to identify and utilize the quantitative trait loci (QTLs)/genes for lodging resistance breeding. Oryza longistaminata exhibits a strong stem and high biomass productivity, which could be a candidate gene pool for cultivars lodging resistance improvement. Here, a set of 152 BC2F20 lines derived from a cross between a cultivated line 93-11 and O. longistaminata was evaluated for lodging resistance. QTL mapping analysis combined with single-nucleotide polymorphism (SNP) marker derived from high-throughput sequencing identified 12 QTLs for stem diameter (SD), 11 QTLs for stem length (SL), and 3 QTLs for breaking strength (BS). Of which, 14 QTLs were first identified from O. longistaminata. A major QTL, qLR1, which was delimited to a region ∼80 kb on chromosome 1, increased stem diameter, stem length, and breaking strength. Another major QTL, qLR8, that was delimited in an interval ∼120 kb on chromosome 8, significantly enhanced the breaking strength. These results provide evidence that O. longistaminata can be exploited to develop lodging-resistant rice lines.
Highlights
Lodging in cereal crops is a major problem that results in decreased grain yield and deteriorated grain quality (Berry et al, 2004)
The negative correlation may be due to the photoperiod sensitivity of some backcross inbred line (BIL). These results indicate that wild rice O. longistaminata can improve the lodging resistance without the stem length reduction
Lodging resistance is an important trait that is necessary for achieving high grain yield in rice production (Khush, 1997)
Summary
Lodging in cereal crops is a major problem that results in decreased grain yield and deteriorated grain quality (Berry et al, 2004). Development of lodging-resistant varieties to cope with this challenge has been widely attended to increase yield in rice, maize, and other crops (Zhu et al, 2013; Peng et al, 2014; Yadav et al, 2017). Recent studies showed that semi-dwarf trait in rice limits photosynthesis and biomass production leading to a yield penalty (Murai et al, 2002). It may have a negative pleiotropic effect on culm morphology (Okuno et al, 2014). The gibberellin synthesis gene (sd1) widely applied in Green Revolution rice reduces the culm strength by decreasing culm diameter, which
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