Genetic analysis of Na+ and K+ concentrations in leaf and stem as physiological components of salt tolerance in Tomato |
| |
Authors: | I Villalta A Reina-Sánchez M C Bolarín J Cuartero A Belver K Venema E A Carbonell M J Asins |
| |
Institution: | (1) Instituto Valenciano de Investigaciones Agrarias, Apartado Oficial, 46113 Valencia, Spain;(2) Consejo Superior de Investigaciones Científicas-Estación Experimental La Mayora, 29750 Algarrobo-Costa, Spain;(3) Consejo Superior de Investigaciones Científicas-Centro de Edafología y Biología Aplicada del Segura, Apartado 164, 3010 Murcia, Spain;(4) Consejo Superior de Investigaciones Científicas-Estación Experimental del Zaidín, Apartado 419, 18080 Granada, Spain |
| |
Abstract: | The sodium and potassium concentrations in leaf and stem have been genetically studied as physiological components of the
vegetative and reproductive development in two populations of F8 lines, derived from a salt sensitive genotype of Solanum lycopersicum cv. Cerasiforme, as female parent, and two salt tolerant lines, as male parents, from S. pimpinellifolium, the P population (142 lines), and S. cheesmaniae, the C population (116 lines). Genetic parameters of ten traits under salinity and five of them under control conditions
were studied by ANOVA, correlation, principal component and QTL analysis to understand the global response of the plant. Two
linkage maps including some tomato flowering time and salt tolerance candidate genes encoding for SlSOS1, SlSOS2, SlSOS3,
LeNHX1, LeNHX3, were used for the QTL detection. Thirteen and 20 QTLs were detected under salinity in the P and C populations,
respectively, and four under control conditions. Highly significant and contributing QTLs (over 40%) for the concentrations
of Na+ and K+ in stems and leaves have been detected on chromosome 7 in both the populations. This is the only genomic position where the
concentration QTLs for both the cations locate together. The proportion of QTLs significantly affected by salinity was larger
in the P population (64.3%, including all QTLs detected under control) than in the C population (21.4%), where the estimated
genetic component of variance was larger for most traits. A highly significant association between the leaf area and fruit
yield under salinity was found only in the C population, which is supported by the location of QTLs for these traits in a
common region of chromososome C1. As far as breeding for salt tolerance is concerned, only two sodium QTLs (lnc1.1 and lnc8.1) map in genomic regions of C1 and C8 where fruit yield QTLs are also located but in both the cases the profitable allele
corresponds to the salt sensitive, cultivated species. One of those QTLs, lnc1.1 might involve LeNHX3. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|