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Trichome density of main stem is tightly linked to PepMoV resistance in chili pepper (Capsicum annuum L.)

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Abstract

A relationship between pepper trichome and pepper mottle virus (PepMoV) resistance was examined. In an intraspecific F2 mapping population from the cross between Capsicum annuum CM334 (trichome-bearing and PepMoV resistant) and Chilsungcho (glabrous and PepMoV susceptible), major QTLs for both traits were identified by composite interval mapping in linkage group (LG) 24 corresponding a telomere region on pepper chromosome 10. Ptel1 of putative trichome enhancing locus was a common major QTL for trichome density on the main stem and calyx. Ptel1 apart from HpmsE031 at a 1.03 cM interval was specifically associated to the trichome density on the main stem, whereas Ptel2 near m104 marker on LG2 was specific for the calyx trichome. Epistatic analysis indicated that Ptel1 engaged in controlling the trichome density by mutual interactions with the organ-specific QTLs. For PepMoV resistance, two QTLs (Pep1 and Pep2) were identified on the LG 24. Pep1 was located with Ptel1 in the R-gene cluster (RGC) for potyvirus resistance including Pvr4 with broad spectrum resistance to potyviruses. Pep1 flanking TG420 marker seemed to be the major factors determining correlation with PepMoV resistance. These results indicate that the level of trichome density on pepper main stem can be used as a morphological marker for Pvr4 in pepper breeding.

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Acknowledgments

This work was supported by a grant (project No. 609002-5) from the Screening Center for Disease Resistant Vegetable Crops of Technology Development Program for Agriculture and Forestry, Ministry for Food, Agriculture, Forestry and Fisheries and the Crop Functional Genomics Center, 21st Frontier Research Program of MEST of the Korean government.

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Correspondence to Doil Choi.

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Communicated by I. Paran.

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Kim, H.J., Han, JH., Kim, S. et al. Trichome density of main stem is tightly linked to PepMoV resistance in chili pepper (Capsicum annuum L.). Theor Appl Genet 122, 1051–1058 (2011). https://doi.org/10.1007/s00122-010-1510-7

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  • DOI: https://doi.org/10.1007/s00122-010-1510-7

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