<i>K-Plus:</i> A gene controlling potassium content in a light-green wheat mutant
2011
Rascio, A. | Carlino, E. | Nicastro, G. | Platani, C. | Russo, M. | Fonzo, N.
A wheat (<i>Triticum turgidum</i> L. var. <i>durum</i>) mutant, designated <i>k-plus</i>, constitutively possesses high leaf potassium content and light-green leaves. To study the genetic basis of these traits and to find out their association, <i>k-plus</i> mutant was crossed to the wild type (WT) Trinakria, <i>F1</i> and <i>F2</i> populations were developed. The flag leaves of parental lines, <i>F1</i> and <i>F2</i> progeny were assayed for ion content, at the heading stage. Potassium content was greater in <i>k-plus</i> than in WT; the <i>F1</i> hybrids behaved like to the WT, in both potassium and leaf colour. The number of genes conditioning leaf potassium content, was not more than one, as estimated by Castle-Wright method. A single recessive locus controls potassium content of <i>k-plus</i> mutant, with the wild type allele completely dominant over the new mutant. Broad sense heritability can be considered sufficient to obtain progress from selection, of <i>k-plus</i> phenotype. Light-green leaf colour was inherited as monogenic recessive allele, which co-segregate with the locus controlling potassium accumulation. Light-green <i>F2</i> sub-population had, on the average, significantly more potassium content than green <i>F2</i> sub-population. These preliminary results encourage further physiologic and genetic analysis of <i>k-plus</i> mutant.
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