期刊
PLANT CELL AND ENVIRONMENT
卷 36, 期 6, 页码 1171-1191出版社
WILEY
DOI: 10.1111/pce.12051
关键词
Solanum cheesmaniae; Solanum lycopersicum; candidate gene analysis; HKT1-like genes; K plus and Na plus concentration
资金
- ERDF [BIO2009-07655, AGL2010-17090, RTA04-075-C2]
- Spanish Ministry of Science and Innovation [AGL2008-00197/AGR]
- ESF from CSIC [AGR2005-436]
- CSIC
- Spanish Ministry of Science and Innovation
The location of major quantitative trait loci (QTL) contributing to stem and leaf [Na+] and [K+] was previously reported in chromosome 7 using two connected populations of recombinant inbred lines (RILs) of tomato. HKT1;1 and HKT1;2, two tomato Na+-selective class I-HKT transporters, were found to be closely linked, where the maximum logarithm of odds (LOD) score for these QTLs located. When a chromosome 7 linkage map based on 278 single-nucleotide polymorphisms (SNPs) was used, the maximum LOD score position was only 35kb from HKT1;1 and HKT1;2. Their expression patterns and phenotypic effects were further investigated in two near-isogenic lines (NILs): 157-14 (double homozygote for the cheesmaniae alleles) and 157-17 (double homozygote for the lycopersicum alleles). The expression pattern for the HKT1;1 and HKT1;2 alleles was complex, possibly because of differences in their promoter sequences. High salinity had very little effect on root dry and fresh weight and consequently on the plant dry weight of NIL 157-14 in comparison with 157-17. A significant difference between NILs was also found for [K+] and the [Na+]/[K+] ratio in leaf and stem but not for [Na+] arising a disagreement with the corresponding RIL population. Their association with leaf [Na+] and salt tolerance in tomato is also discussed.
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