Journal
MOLECULAR PLANT
Volume 8, Issue 2, Pages 303-314Publisher
CELL PRESS
DOI: 10.1016/j.molp.2014.10.009
Keywords
culm; OsTB1; strigolactone; lodging resistance; quantitative trait loci
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Funding
- Ministry of Agriculture, Forestry and Fisheries of Japan [IPG-0003, RBS2003]
- Japan Society for the Promotion of Science [23248002]
- Grants-in-Aid for Scientific Research [25660014, 14J01393, 25252007, 23248002, 15H04442] Funding Source: KAKEN
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Lodging has been a major roadblock to attaining increased crop productivity. In an attempt to understand the mechanism for culm strength in rice, we isolated an effective quantitative trait locus (QTL), STRONG CULM3 (SCM3), the causal gene of which is identical to rice TEOS1NTE BRANCHED1 (OsTB1), a gene previously reported to positively control strigolactone (SL) signaling. A near-isogenic line (NIL) carrying SCM3 showed enhanced culm strength and increased spikelet number despite the expected decrease in tiller number, indicating that SL also has a positive role in enhancing culm strength and spikelet number. We produced a pyramiding line carrying SCM3 and SCM2, another QTL encoding AP01 involved in panicle development. The NIL-SCM2+SCM3 showed a much stronger culm than NIL-SCM2 and NIL-SCM3 and an increased spikelet number caused by the additive effect of these QTLs. We discuss the importance of utilizing suitable alleles of these STRONG CULM QTLs without inducing detrimental traits for breeding.
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