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Fine mapping of the tomato yellow leaf curl virus resistance gene Ty-2 on chromosome 11 of tomato

文献类型： 外文期刊

作者： Yang, Xiaohui 1 ; Caro, Myluska 4 ; Hutton, Samuel F. 3 ; Scott, John W. 3 ; Guo, Yanmei 1 ; Wang, Xiaoxuan 1 ; Rashid, Md Harunur 4 ; Szinay, Dora 5 ; de Jong, Hans; Visser, Richard G. F. 4 ; Bai, Yuling 4 ; Du, Yongchen 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Vegetable & Flowers, Beijing 100081, Peoples R China

2.Shandong Acad Agr Sci, Inst Vegetables & Flowers, Shandong Key Lab Biol Greenhouse Vegetables, Jinan, Peoples R China

3.Univ Florida, Gulf Coast Res & Educ Ctr, Wimauma, FL 33598 USA

4.Univ Wageningen & Res Ctr, Wageningen UR Plant Breeding, NL-6708 PB Wageningen, Netherlands

5.Wageningen Univ,

关键词： Breeding; Resistance; Tomato; Tomato yellow leaf curling virus (TYLCV); Virus-induced gene silencing

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2014 年 34 卷 2 期

页码：

收录情况： SCI

摘要： Resistances to begomoviruses, including bipartite tomato mottle virus and monopartite tomato yellow leaf curl virus (TYLCV), have been introgressed to cultivated tomato (Solanum lycopersicum) from wild tomato accessions. A major gene, Ty-2 from S. habrochaites f. glabratum accession "B6013," that confers resistance to TYLCV was previously mapped to a 19-cM region on the long arm of chromosome 11. In the present study, approximately 11,000 plants were screened and nearly 157 recombination events were identified between the flanking markers C2_At1g07960 (82.5 cM, physical distance 51.387 Mb) and T0302 (89 cM, 51.878 Mb). Molecular marker analysis of recombinants and TYLCV evaluation of progeny from these recombinants localized Ty-2 to an approximately 300,000-bp interval between markers UP8 (51.344 Mb) and M1 (51.645 Mb). No recombinants were identified between TG36 and C2_At3g52090, a region of at least 115 kb, indicating severe recombination suppression in this region. Due to the small interval, fluorescence in situ hybridization analysis failed to clarify whether recombination suppression is caused by chromosomal rearrangements. Candidate genes predicted based on tomato genome annotation were analyzed by RT-PCR and virus-induced gene silencing. Results indicate that the NBS gene family present in the Ty-2 region is likely not responsible for the Ty-2-conferred resistance and that two candidate genes might play a role in the Ty-2-conferred resistance. Several markers very tightly linked to the Ty-2 locus are presented and useful for marker-assisted selection in breeding programs to introgress Ty-2 for begomovirus resistance.

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