文献类型： 外文期刊

作者： Pascual, Laura ¹ ; Yan, Jinqiang ¹ ; Pujol, Marta ¹ ; Monforte, Antonio J. ³ ; Pico, Belen ⁴ ; Montserrat Martin-He ¹ ;

作者机构： 1.UB, UAB, IRTA, CRAG,CSIC, C Vall Moronta,Edifici CRAG, Barcelona, Spain

2.IRTA, Campus UAB, Barcelona, Spain

3.Univ Politecn Valencia, CSIC, IBMCP, Valencia, Spain

4.Univ Politecn Valencia, COMAV, Inst Conservat & Breeding Agr Biodivers, Camino Vera S-N, Valencia, Spain

5.Univ Politecn Madrid, Dept Biotechnol Plant Biol, Sch Agr Food & Biosyst Engn, Madrid, Spain

6.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangzhou, Guangdong, Peoples R China

关键词： melon; genetic diversity; VPS41; Cucumber mosaic virus; Resistance; Phloem loading

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2019 年 10 卷

页码：

收录情况： SCI

摘要： Melon production is often compromised by viral diseases, which cannot be treated with chemicals. Therefore, the use of genetic resistances is the main strategy for generating crops resistant to viruses. Resistance to Cucumber mosaic virus (CMV) in melon is scarcely described in few accessions. Until recently, the only known resistant accessions were Freeman's Cucumber and PI 161375, cultivar Songwhan Charmi (SC). Resistance to CMV in melon is recessive and generally oligogenic and quantitative. However, in SC, the resistance to CMV strains of subgroup II is monogenic, depending only on one gene, cmv1, which is able to stop CMV movement by restricting the virus to the bundle sheath cells and preventing a systemic infection. This restriction depends on the viral movement protein (MP). Chimeric viruses carrying the MP of subgroup II strains, like the strain LS (CMV-LS), are restricted in the bundle sheath cells, whereas those carrying MP from subgroup I, like the strain FNY (CMV-FNY), are able to overcome this restriction. cmv1 encodes a vacuolar protein sorting 41 (CmVPS41), a protein involved in the transport of cargo proteins from the Golgi to the vacuole through late endosomes. We have analyzed the variability of the gene CmVPS41 in a set of 52 melon accessions belonging to 15 melon groups, both from the spp melo and the spp agrestis. We have identified 16 different haplotypes, encoding 12 different CmVPS41 protein variants. Challenging members of all haplotypes with CMV-LS, we have identified nine new resistant accessions. The resistance correlates with the presence of two mutations, either L348R, previously found in the accession SC and present in other three melon genotypes, or G85E, present in Freeman's Cucumber and found also in four additional melon genotypes. Moreover, the new resistant accessions belong to three different melon horticultural groups, Conomon, Makuwa, and Dudaim. In the new resistant accessions, the virus was able to replicate and move cell to cell, but was not able to reach the phloem. Therefore, resistance to phloem entry seems to be a general strategy in melon controlled by CmVPS41. Finally, the newly reported resistant accessions broaden the possibilities for the use of genetic resistances in new melon breeding strategies.