AUTHOR=Long Weixiong , Dan Dong , Yuan Zhengqing , Chen Yunping , Jin Jie , Yang Weilong , Zhang Zhihong , Li Nengwu , Li Shaoqing 

TITLE=Deciphering the Genetic Basis of Lodging Resistance in Wild Rice Oryza longistaminata

JOURNAL=Frontiers in Plant Science

VOLUME=11

YEAR=2020

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2020.00628

DOI=10.3389/fpls.2020.00628

ISSN=1664-462X

ABSTRACT=<p>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. <italic>Oryza longistaminata</italic> 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 BC<sub>2</sub>F<sub>20</sub> lines derived from a cross between a cultivated line 93-11 and <italic>O. longistaminata</italic> 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 <italic>O. longistaminata</italic>. A major QTL, <italic>qLR1</italic>, which was delimited to a region ∼80 kb on chromosome 1, increased stem diameter, stem length, and breaking strength. Another major QTL, <italic>qLR8</italic>, that was delimited in an interval ∼120 kb on chromosome 8, significantly enhanced the breaking strength. These results provide evidence that <italic>O. longistaminata</italic> can be exploited to develop lodging-resistant rice lines.</p>