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Unconditional and Conditional QTL Mapping for Tiller Numbers at Various Stages with single segment substitution lines in Rice(Oryza sativa L.)

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Agricultural Sciences in China 2008年第3期7卷 257-265页

作者： ZHAO Fang-ming LIU Gui-fu ZHU Hai-tao DING Xiao-hua ZENG Rui-zhen ZHANG Ze-min LI Wen-tao ZHANG Gui-quan Guangdong Key Laboratory of Plant Molecular Breeding South China Agricultural University Guangzhou 510642 P.R.China

Tiller is one of the most important agronomic traits which influences quantity and quality of effective panicles and finally influences yield in rice. It is important to understand ＂static＂ and ＂dynamic＂ information of the QTLs for tillers in rice. This work was the first time to simultaneously map unconditional and conditional QTLs for tiller numbers at various stages by using single segment substitution lines in rice. Fourteen QTLs for tiller number, distributing on the corresponding substitution segments of chromosomes 1, 2, 3, 4, 6, 7 and 8 were detected. Both the number and the effect of the QTLs for tiller number were various at different stages, from 6 to 9 in the number and from 1.49 to 3.49 in the effect, respectively. Tiller number QTLs expressed in a time order, mainly detected at three stages of 0-7 d, 14-21 d and 35-42 d after transplanting with 6 positive, 9 random and 6 negative expressing QTLs, respectively. Each of the QTLs expressed one time at least during the whole duration of rice. The tiller number at a specific stage was determined by sum of QTL effects estimated by the unconditional method, while the increasing or decreasing number in a given time interval was controlled by the total of QTL effects estimated by the conditional method. These results demonstrated that it is highly effective and accurate for mapping of the QTLs by using single segment substitution lines and the conditional analysis methodology.

关键词： single segment substitution line unconditional QTL mapping conditional QTL mapping tiller number rice

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QTL Detection for Rice Grain Shape Using Chromosome single segment substitution lines

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Rice science 2011年第4期18卷 273-278页

作者： Sheng-qiang LI Guo-kun CUI Cheng-ran GUAN Jun WANG Guo-hua LIANG Jiangsu Key Laboratory of Crop Genetics and Physiology / Key Laboratory of the Ministry of Education for Plant Functional Genomics Yangzhou University Yangzhou 225009 China

Rice grain shape is one of the important factors affecting grain quality and yield,but it is liable to be influenced by genetic backgrounds and *** chromosome single segment substitution lines(SSSLs) in rice have been considered as ideal populations to identify the quantitative trait loci(QTLs).In this study,22 QTLs affecting rice grain shape were detected to be distributed on eight chromosomes except chromosomes 6,9,11 and 12 by using *** them,seven QTLs conditioned grain length,six conditioned grain width,five affected grain length-width ratio and four controlled grain thickness.

关键词： rice single segment substitution line grain shape quantitative trait locus

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Identification of QTLs for Plant Height and Its Components by Using single segment substitution lines in Rice (Oryza sativa)

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Rice science 2005年第3期12卷 151-156页

作者： Akshay TALUKDAR Guangdong Provincial Key Laboratory of Plant Molecular Breeding South China Agricultural University

QTLs for plant height and its components on the substituted segments of fifty-two single segment substitution lines （SSSLs） in rice were identified through t-test （P〈0.001） for comparison between each SSSL and recipient parent Huajingxian 74. On the 14 substituted segments, 24 QTLs were detected, 10 for plant height, 2 for panicle length, 4 for length of the first internode from the top, 5 for length of the second internode from the top and 3 for length of the third internode from the top, respectively. All these QTLs were distributed on nine rice chromosomes except chromosomes 5, 9 and 11. The additive effect ranged from -4.08 to 3.98 cm, and the additive effect percentages varied from -19.35% to 10.43%.

关键词： rice single segment substitution line plant height quantitative trait locus

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Identification of Multiple Alleles at the Wx Locus and Development of single segment substitution lines for the Alleles in Rice

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Rice science 2006年第1期13卷 9-14页

作者： Akshay TALUKDAR Guangdong Provincial Key Laboratory of Plant Molecular Breeding South China Agricultural University Guangzhou 510642 China

The microsatellite markers 484/485 and 484/W2R were used to identify the multiple alleles at the Wx locus in rice germplasm. Fifteen alleles were identified in 278 accessions by using microsatellite class and G-T polymorphism. Among these alleles, （CT）12-G, （CT）15-G, （CT）16-G, （CT）17-G, （CT）18-G and （CT）21-G have not been reported. Seventy-two single-segment substitution lines （SSSLs） carrying different alleles at the Wx locus were developed by using Huajingxian 74 with the （CT）11-G allele as a recipient and 20 accessions containing 12 different alleles at the Wx locus as donors. The estimated length of the substituted segments ranged from 2.2 to 77.3 cM with an average of 17.4 cM.

关键词： rice waxy gene single segment substitution line allelic variation molecular marker-assisted selection

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Detection of QTLs for Important Agronomic Traits and Analysis of Their Stabilities Using SSSLs in Rice

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Agricultural Sciences in China 2007年第7期6卷 769-778页

作者： ZHAO Fang-ming ZHU Hai-tao DING Xiao-hua ZENG Rui-zhen ZHANG Ze-min LI Wen-tao ZHANG Gui-quan Guangdong Provincial Key Laboratory of Plant Molecular Breeding South China Agricultural University Guangzhou 510642 P.R.China

single segment substitution lines （SSSLs） each with a single chromosome segment from a donor under the same genetic background as the recipient were developed in rice by advanced backcrossing and molecular marker-assisted selection. Using the SSSLs, the QTLs for the important agronomic traits in rice would be detected under different environmental conditions. Detection of the QTLs controlling 22 important traits in rice was done with 32 SSSLs by the randomized block design in 2-4 cropping seasons. 59 QTLs were detected and distributed on chromosomes 1, 2, 3, 4, 6, 7, 8, 10, and 11, of which 18 QTLs were detected more than twice. Only 30.5% of the QTLs were detected repeatedly in different cropping seasons. Most of the QTLs of important agronomic traits were of little additive effects and instability. The QTLs controlling the traits, such as grain weight, grain length, ratio of grain length to width, and heading date were relatively stable. The stable QTLs usually had larger additive effects and were less affected by environment. The QTLs for the important agronomic traits were detected using the SSSLs in rice with high resolution under different environmental conditions. The instability of the QTLs may be the basis of the variation of rice plants during growth and development. It would be the genetic basis for improving yield and quality in rice cultivars by farming methods.

关键词： rice single segment substitution line quantitative trait locus agronomic trait

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Development of a platform for breeding by design of CMS lines based on anSSSL library in rice(Oryza sativaL.)

Development of a platform for breeding by design of CMS line...

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广东省遗传学会第九届代表大会暨学术研讨会

作者： Ziju Dai Qing Lu Xin Luan Jian Cai Haitao Zhu Ziqiang Liu Ruizhen Zeng Zemin Zhang Shaokui Wang Lingjie Zheng Jialin Li Guiquan Zhang State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural University

Cytoplasmic male sterility(CMS) is an important foundation for heterosis utilization andexploited widely to hybrid seed production in ***,the traditional experiencedriven and labor-cost breeding style left little room for sustainable improvement ofhybrid *** of molecular biology and genomics provides a chance toenhance hybrid rice breeding efficiency through breeding by *** this study,aline H121 B with rj3 and rf4 genes from XieqingzaoB(XB) was developed in theHuajingxian74(HJX74) genetic *** H121 B as maintainer line,threeisonuclear alloplasmic CMS lines,W-H121 A,D-H121 A and Y-H121 A,with the wildabortive(WA),dwarf wild abortive(DA),and Yegong abortive(YA) types of CMScytoplasm,respectively,were *** H121 B maintainer line was thenimproved by a way of breeding by *** favorable alleles,gs3 for long grain,Wxlfor low amylose content,and OsMADSSO for early heading date,in the chromosomalsubstituted segments of single segment substitution lines(SSSLs) were selected fromthe SSSL library in the HJX74 genetic background,and were pyramided together inH121 B through marker-assisted selection(MAS).The new maintainer line,H131 B,showing the phenotypes of longer in grain length,lower in amylose content,and earlierin heading date than those in H121 B,achieved the breeding goal ***131 B as maintainer line,three new isonuclear alloplasmic CMS lines,W-H131 A,DH131A and Y-H131 A,were *** results indicate that breeding by designin rice can be conducted under the platform of the HJX74 SSSL *** the platform for breeding by design of CMS lines will be helpful for sustainableimprovement of CMS lines in hybrid rice development.

关键词： single segment substitution line Cytoplasmic male sterility Breeding by design Rice

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