Next generation long-culm rice with superior lodging resistance and high grain yield, Monster Rice 1
Next generation long-culm rice with superior lodging resistance and high grain yield, Monster Rice 1
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DOI：
10.1371/journal.pone.0221424
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发表时间：
2019-08-22
期刊：
影响因子：
3.7
通讯作者：
Ookawa, Taiichiro
中科院分区：
文献类型：
--
作者：
Nomura, Tomohiro;Arakawa, Naoya;Ookawa, Taiichiro
在20世纪60年代后期的绿色革命中，研究人员利用半矮秆1号（sd 1）来提高水稻的产量和抗倒伏性。而sd 1则对秆力和生物量产生负效应。为了在世纪大幅度提高产量，需要培育不依赖sd 1的不倒伏、高产的下一代长秆水稻。本研究以长秆重穗型水稻新品系Monster Rice 1为材料，与高产半矮秆水稻品种Takanari进行了产量和抗倒伏相关性状的比较研究。巨稻1号的糙米产量和基部伸长节间的断裂弯矩均高于高成，这是由于其每穗颖花数多和茎秆较粗所致。此外，为了鉴定这些性状的具有上级等位基因的QTL，使用F-2群体和来自Monster Rice 1与Takanari杂交的重组自交系进行QTL和单倍型分析。本研究结果表明，利用这些已鉴定的产量和抗倒性QTL，具有上级抗倒性的长秆重穗型水稻可以发挥其高产潜力。
During late 1960s Green Revolution, researchers utilized semidwarf 1 (sd1)to improve the yield and lodging resistance in rice (Oryza sativa L.). However, sd1 has a negative effect to culm strength and biomass production. To increase yield dramatically in 21th century, development of next generation long-culm rice for non-lodging and high grain yield independent of sd1 has been needed. The present study developed Monster Rice 1, a long-culm and heavy-panicle type of rice line and compared it with Takanari, a high-yielding semidwarf rice variety about yield and lodging resistance associated traits. Brown rice yield and bending moment at breaking of the basal elongated internode were higher in Monster Rice 1 than those in Takanari due to a large number of spikelets per panicle and thicker culm. Furthermore, to identify QTLs with superior alleles for these traits, QTL and haplotype analyses were performed using F-2 population and recombinant inbred lines derived from a cross between Monster Rice 1 and Takanari. The results from this study suggest that long-culm and heavy-panicle type of rice with a superior lodging resistance by culm strength can perform its high yield potential by using these identified QTLs contributing yield and lodging resistance.