水稻CSSL-Z492单、双片段代换系构建及粒型QTL的遗传解析

doi:10.3864/j.issn.0578-1752.2025.03.001

Abstract

Abstract:

【Objective】Rice grain size is a quantitative trait controlled by multiple genes. They can be dissected into a single segment substitution line (SSSL), which is of great significance for their genetic mechanism study and breeding by design. 【Method】Z492, a chromosome segment substitution line in the genetic background of Nipponbare, was used as material to dissect QTL for rice grain size by mixed linear model (MLM) method. 【Result】The F₂ population was constructed from Nipponbare/Z492 to identify four QTL for grain size, including qGL6 and qGL7 for grain length and qRLW7 and qRLW12 for rate of grain length to width. Then three single-segment substitution lines (SSSL, S1-S3) and 3 dual-segment substitution lines (DSSL, D1-D3) carrying these QTL were further constructed. And the SSSL were then used to detect eight QTL for grain size, including qGL6, qGL7 and six newly identified QTL (qGW6, qRLW6, qGW7, qGWT7, qGL12, qGW12). Simultaneously, the genetic model of different QTL in 3 DSSL were analyzed. The results showed that interaction of qGL6 (a=0.26 mm) and qGL7 (a=0.21 mm) produced -0.21 mm of grain length epistatic effect, which resulted in the genetic effect (0.26 mm) of D1 equal to the additive effect of each QTL. Thus, the grain length (7.98 mm) of D1 displayed no difference from those (7.89 and 7.98 mm) of S2 with qGL7 and S1 containing qGL6, while significantly longer than that (7.47 mm) of Nipponbare. The result indicated that it is not necessary to pyramid qGL6 and qGL7 in breeding by design for increasing grain length. qGW6 (a=0.07 mm) and qGW12 (a=0.06 mm) belonged to independent inheritance in D2, thus, the genetic effect (0.13 mm) after pyramiding of qGW6 and qGW12 caused the grain width (3.65 mm) of D2 broader significantly than any of the SSSL with the single QTL. So, qGW6 and qGW12 can be selected to increase grain width in breeding by design. Interaction of qGW7 (a=0.11 mm) and qGW12 (a=0.06 mm) yielded -0.10 mm of epistatic effect, causing the grain width genetic effect (0.07 mm) of D3 parallel to the additive effect of qGW12. Thus, the grain width (3.59 mm) of D3 exhibited no difference with that (3.56 mm) of S3 carrying qGW12, while wider significantly than that (3.44 mm) of Nipponbare and narrower significantly than that (3.66 mm) of S2. 【Conclusion】It is very necessary for breeding by design to identify QTL for different important traits using SSSL and DSSL. Pyramiding different QTL produce various genetic models. Some display independent inheritance, and others exhibit various epistatic effects. In addition, to cross with S1 and S3 can realize the goal of longer, wider and heavier rice grain, and to cross with S1 and S2 can reach the target of heavier grain weight, while to cross with S2 and S3 have no any effects in grain size.

Key words: rice, grain size, QTL, single segment substitution lines, QTL interaction

LI Lu, XIE Zhuang, XIE KeYing, ZHANG Han, ZHAO ZhuoWen, XIANG AoNi, LI QiaoLong, LING YingHua, HE GuangHua, ZHAO FangMing. Construction of Single and Dual-Segment Substitution Lines from Rice CSSL-Z492 and Genetic Dissection of QTL for Grain Size[J].Scientia Agricultura Sinica, 2025, 58(3): 401-415.

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性状 Trait	QTL	染色体 Chr.	连锁标记 Linked marker	估计效应 Estimated effect	贡献率 Var. (%)	P值 P value
粒长Grain length (mm)	qGL6	6	RM494	0.07	4.97	0.0314
粒长Grain length (mm)	qGL7	7	RM5672	0.15	24.16	<0.0010
长宽比Rate of length to width	qRLW7	7	RM5672	0.03	6.24	0.0208
长宽比Rate of length to width	qRLW12	12	RM491	0.03	4.57	0.0400

Construction of Single and Dual-Segment Substitution Lines from Rice CSSL-Z492 and Genetic Dissection of QTL for Grain Size

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