Genetic analysis of the protein and lysine content of spring triticale
Protein content and lysine content of protein were evaluated in the grain of 147 spring triticale lines (× Triticosecale Wittmack) derived from 15 crosses, and grown at two locations. Percent protein was negatively correlated with 1000-grain weight, grain plumpness, and yield per plant. Protein per grain was positively correlated with these traits. Lysine content of protein was negatively correlated with percent protein, protein per grain, 1000-grain weight, grain plumpness, and yield per plant. Covariate adjustment for correlated traits greatly reduced genotypic variation in the lysine content of protein. Reciprocal (cytoplasmic) differences were detected for protein per grain in some crosses. Gene effects analysis detected mainly additive gene action. Some dominance was detected for higher protein per grain. Nonallelic interaction was detected for percent protein and protein per grain in one cross each. Additive genetic variation appeared to be sufficient for improvement of grain protein content, but insufficient for improvement of lysine content by conventional breeding efforts.