A Solanum lycopersicum × Solanum pimpinellifolium Linkage Map of Tomato Displaying Genomic Locations of R-Genes, RGAs, and Candidate Resistance/Defense-Response ESTs

Figure 2

A genetic linkage map of tomato constructed based on an F₂ population of a cross between a tomato (S. lycopersicum) breeding line (NCEBR-1) and an accession (LA2093) of tomato wild species S. pimpinellifolium and 250 RFLP, EST, and RGA markers. RFLP markers are shown in blue, ESTs in green, and RGAs in red fonts. The names of the markers are shown at the right and the map distances between them (in cM, using Kosambi function) are shown at the left of the chromosomes. The approximate chromosomal locations of disease-resistance genes (𝑅-genes) and quantitative resistance loci (QRL), as inferred from other published researches, are shown in parentheses to the right of chromosomes. The descriptions of the 𝑅-genes and QRL are as follows: Asc: resistance to Alternaria stem canker (Alternaria alternata f. sp. lycopersici) [54, 55]; Bw (1–5) or Rrs (3–12): QLRs for resistance to bacterial wilt (Ralstonia solanacearum) [56–59]; Cf (1–9, ECP2): resistance to leaf mould (Cladosporium fulvum) [60–65]; Cmr: cucumber mosaic virus [66]; Fen: sensitivity to herbicide fenthion [67]; Frl: resistance to Fusarium crown and root rot (Fusarium oxysporum f. sp. radicis-lycopersici) [68]; Hero: resistance to potato cyst namatode (Globodera rostochiensis) [69]; I (I, 1, 2, 2C, 3): resistance to different races of Fusarium wild (Fusarium oxysporum f. sp. lycopersici) [70–78]; Lv: resistance to powdery mildew (Leveuillula taurica) [79]; Meu-1: resistance to potato aphid [80–82]; Mi (Mi, 1, 2, 3, 9): resistance to root knot nematodes (Meloidogyne spp.) [81, 83–89]; Ol (1, 2, 3): resistance to powdery mildew (Oidium lycopersicum) [90, 91]; Ph (1, 2, 3): resistance to late blight (Phytophthora infestans) in tomato [92–94]; Pot-1: resistance to potyvirus [95]; Pto and Prf: resistance to bacterial speck (Pseudomonase syringae pv tomato) [96, 97]; Py-1: resistance to corky root rot (Pyrenochaeta lycopersici) [98]; Rcm (1–10): QRL for resistance to bacterial canker (Clavibacter michiganensis) [99, 100]; Rrs (3–12) or Bw (1–5): QLRs for resistance to bacterial wilt (Ralstonia solanacearum) [56–59]; Rx (1, 2, 3, 4): resistance to bacterial spot (Xanthomonas campestris) [101–103]; Sm: resistance to Stemphilium [104]; Sw-5: resistance to tomato-spotted wilt virus [105, 106]; Tm-1 and Tm-2^a: resistance to tobacco mosaic virus [68, 107–110]; Ty (1, 2, 3): resistance to tomato yellow leaf curl virus [111–113]; Ve: resistance to Verticillium dahliae [114, 115].