Functional analysis of the lodging resistance QTL BSUC11 on morphological and chemical characteristics in upper culms of rice
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Culm strength deterioration from grain filling to the fully ripe stage is one of the main causes of rice lodging. The quantitative trait locus for resistance to bending-type lodging, BSUC11, prevents upper culms from deteriorating their physical strength. The physical strength of culms is determined by morphological traits and chemical components. To clarify key factors preventing strength deterioration of culms after grain filling, this study conducted functional analyses on morphological traits and chemical components of upper culms using chromosomal segment substitution lines (CSSLs) containing BSUC11. Dry weights of upper culms in CSSLs with BSUC11 were heavier than those of ‘Koshihikari’ from 4 to 6 weeks after heading. For morphological traits at the fully ripe stage, CSSLs with BSUC11 only showed a thickening of cortical fiber tissues in internode I, and did not have greater diameter or wall thicknesses of upper culms. Additionally, the upper culms of CSSLs with BSUC11 increased holocellulose content instead of lignin, nonstructural carbohydrates, or minerals compared with ‘Koshihikari’. These results suggest that culm strength deterioration after grain filling is contributed to by holocellulose content rather than morphological traits in rice culms, and BSUC11 could improve lodging resistance through prevention of this deterioration factor.
KeywordsLodging resistance Breaking strength Structural carbohydrate Holocellulose Rice
This work was supported by Grant-in-Aid for Young Scientists (B, 15K18632).
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