Finding the superior allele of japonica-type for increasing stem lodging resistance in indica rice varieties using chromosome segment substitution lines

• Published in: Rice (New York, N.Y.) Vol. 11; no. 1; pp. 25 - 14
• Main Authors: Mulsanti, Indria Wahyu, Yamamoto, Toshio, Ueda, Tadamasa, Samadi, Ahmad Fahim, Kamahora, Eri, Rumanti, Indrastuti Apri, Thanh, Vo Cong, Adachi, Shunsuke, Suzuki, Sakae, Kanekatsu, Motoki, Hirasawa, Tadashi, Ookawa, Taiichiro
• Format: Journal Article
• Language: English
• Published: New York Springer US 18.04.2018; Springer Nature B.V; SpringerOpen
• Subjects: Agriculture; Alleles; Bending moments; Bending stresses; Bending-type lodging; Biomedical and Life Sciences; Breaking-type lodging; Cell wall material density; Cellulose; Cereal crops; Chromosome 5; Chromosomes; Gene loci; Gene mapping; Hemicellulose; Life Sciences; Lodging; Mechanical properties; Modulus of elasticity; Moments of inertia; Original; Original Article; Oryza; Plant Breeding/Biotechnology; Plant Ecology; Plant Genetics and Genomics; Plant Sciences; QTL; Quantitative trait loci; Rice; Rigidity; Segments; Substitutes; QTL; Breaking-type lodging; Cell wall material density; Bending-type lodging; Rice
• ISSN: 1939-8425; 1939-8433; 1934-8037
• DOI: 10.1186/s12284-018-0216-3

Background In cereal crops, stem lodging can be classified into two types: stem-breaking type and stem-bending type. To improve stem-lodging resistance, the strong culm traits of superior lodging-resistant varieties must be characterized. The identification of quantitative trait loci (QTLs) and the corresponding genes associated with the parameters for bending moment at breaking (M) and flexural rigidity (FR) is expected to enable the efficient development of lodging-resistant varieties. A set of Chromosome Segment Substitution Lines (CSSLs) derived from the cross between Takanari and Koshihikari were used in this study to identify QTLs associated with lodging resistance. Results The indica variety Takanari possesses large M due to its large section modulus (SM) despite its small bending stress (BS), whereas Takanari also has large FR due to its large secondary moment of inertia (SMI) and Young’s modulus (YM). The QTLs for BS were assigned to chromosomes 3, 5, 6, 8, 9, 10, 11, and 12. Koshihikari alleles increased BS in these QTLs. The YM was increased by substitution of the Koshihikari chromosomal segments on chromosomes 2, 10, and 11. Other QTLs mapped to chromosomes 7 and 12, such that the Koshihikari alleles contributed to the decrease of YM. QTLs for cellulose density were assigned to chromosomes 1, 3, and 5, which were replaced by substitutions of Koshihikari segments. The QTLs for hemicellulose, cellulose, and holocellulose densities identified on chromosome 5 overlapped with those for BS, indicating the positive effect of the Koshihikari segment on increasing BS. Conclusions These results suggested that the QTLs for the densities of cell wall materials in japonica varieties contributed to increased BS and might be utilized for improving lodging resistance in indica varieties of rice.