No abstract

We evaluated salt tolerance in 319 recombinant inbred lines derived from a cross between Roshan and Falat (seri82) in bread wheat (Triticum aestivum L.). This study identified quantitative trait lci (QTLs) with additive (a) and additive×additive (aa) epistatic effects, and characterized their salt treatment interactions (at and aat) at the seedling stage. Using a genetic map of 730 DArT and SSR markers, we identified 65 additive QTLs governing 13 traits using the QTL Cartographer program to assess single-treatment phenotypic values. We further identified 13 additive and 14 epistatic QTLs for 10 traits with the QTLNetwork program using multitreatment phenotypic values. Our results show that four of the additive and seven of the epistatic QTLs exhibited an effect on the response to salt treatment. Morphological traits had less effect on treatment than physiological traits did. Of the three additive QTLs found to affect shoot Na + concentration, two colocalized with loci governing shoot fresh or dry weight (1B-2 and 3B-1). Thirteen pairs of QTLs across five chromosomal groups were detected at homologous positions in the A, B, and D genomes, indicative of synteny.

No abstract

Problem statement: The Genotype by Trait (GT) biplot can be used to compare cultivars on the basis of multiple traits and to identify cultivars that are particularly good in certain traits and therefore can be candidates for parents in plant breeding program. Approach: The objective of this study was to evaluate the maize hybrids based on Genotype by Traits (GT) biplot to examine its usefulness in visualizing maize trait relationship and its application in hybrids comparison. Results: Correlation coefficient between phenological-agronomic traits showed that there is a strong positive relationship between all of the measured traits, except Anthesis-Silking Interval (ASI). This pattern approximately repeated during three years. Also, correlation coefficient between grain yield components reveals a positive or negative relation between measured traits. These results reflect the complexity of the correlation among the grain yield components. The genotype by trait comparison indicated that KSC 700 had greater value for rows number per ear and kernel depth whereas OSSK 602 and ZP 684 had greater value for thousand kernel weight and grain number per row. Conclusion: Results indicate that the pattern of the polygon view traits varied across three years. Consequently, GT biplot describes the interrelationships among traits and it was used to identifying hybrids that are good for some particular traits

No abstract