Introgression of a 4D chromosomal fragment into durum wheat confers aluminium tolerance

• DOI: 10.1093/aob/mcu070
• Publication Date: 2014-04-16T04:13:54Z
• Authors: Chang Han; Peter R. Ryan; ZeHong Yan; Emmanuel Delhaize
• Keywords: Introgression

Aluminium (Al3+) inhibits root growth of sensitive plant species and is a key factor that limits durum wheat (Triticum turgidum) production on acid soils. The aim this study was to enhance the Al3+ tolerance an elite cultivar by introgression chromosomal fragment from hexaploid aestivum) possesses gene. A 4D(4B) substitution line 'Langdon' backcrossed 'Jandaroi', current semi-dwarf Australian durum. In second backcross, using 'Jandaroi' as recurrent parent, seedling identified where TaALMT1 chromosome 4D recombined with Rht-B1b locus 4B yield Al3+-tolerant habit. This used in third backcross generate homozygous sister lines contrasting tolerances. were characterized compared selected cultivars for their Na+ tolerances hydroponic culture well short-term experiments assess soil. Analysis derived showed substantially enhanced tolerance. ability exclude leaves also enhanced, indicating possessed Kna1 salt locus. Although seminal roots soil, development fine not robust found wheat. characteristics absence toxicity introgressed did affect total grain but reduced weight individual grains. results show it possible increase fragment. Further improvements are possible, such introducing additional genes eliminating responsible smaller weights.