title: Genetic  analysis of NaCl tolerance in tomato.
abstract: We attempted to find the suitable parents  for the development of tomato hybrids for high salt soils by exploiting  combining ability, gene action and heterosis. Six salt-tolerant and three  salt-intolerant genotypes, along with their 18 F1 crosses, were evaluated at  seedling stage under 10 and 15 dS/m (NaCl) salinity stress, compared to the  control level of salinity. The experiment was laid out based on a two-way  complete randomized design factorial arrangement with two replications; data on  root and shoot length, fresh and dry weights, leaf area, plant length, Na(+), K(+) and K(+)/Na(+) concentrations were recorded. There was  significant variation within genotypes, lines, testers, crosses, and line ×  tester interaction for all plant characters studied under normal and two salinity  levels. Estimates of combining ability indicated that under low (10 dS/m) and  high (15 dS/m) salinities, line BL1176 and tester LO2875 showed significant GCA  effects for most of the traits studied. The cross-combinations 6233 × LO2875,  CLN2498A x LO2875 and BL1176 × 17902 showed highest SCA values for most of the  characters under 10 and 15 dS/m, respectively. Potence ratio showed that under  low and high salinities, all the traits showed over dominant type of gene  action except leaf area and K(+)  concentration (in 10  dS/m) and shoot length, and leaf area (in 15 dS/m). The highest heterosis for  most of the parameters was observed in cross-combinations BL1176 × LO2875 and  CLN2498A x LO2875.
authors.affiliation: Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad, Pakistan. drasifpbg@gmail.com
authors.forename: A
authors.initials: A
authors.lastname: Saeed
authors.forename: M Q
authors.initials: MQ
authors.lastname: Shahid
authors.forename: S A
authors.initials: SA
authors.lastname: Anjum
authors.forename: A A
authors.initials: AA
authors.lastname: Khan
authors.forename: A
authors.initials: A
authors.lastname: Shakeel
authors.forename: M F
authors.initials: MF
authors.lastname: Saleem
authors.forename: N
authors.initials: N
authors.lastname: Saeed
mesh_terms: D001947:Breeding; D003433:Crosses, Genetic; D005838:Genotype; D006823:Hybrid Vigor; D018551:Solanum lycopersicum / Q000235:genetics* / Q000254:growth & development; D010641:Phenotype; D018515:Plant Leaves; D018517:Plant Roots / Q000502:physiology; D054712:Salinity; D055049:Salt Tolerance / Q000235:genetics*; D055051:Salt-Tolerant Plants / Q000235:genetics* / Q000254:growth & development; D036226:Seedlings / Q000235:genetics / Q000502:physiology; D012965:Sodium Chloride; D013312:Stress, Physiological
chemical_list: D012965:Sodium Chloride