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Inheritance of flag leaf angle in wheat (Triticum aestivum L.)^*

Rosa Maria Oviedo de Cristaldo; Fernando Irajá Felix de Carvalho; José F. Barbosa-Neto; Luiz Carlos Federizzi

Universidade Federal do Rio Grande do Sul, Pró-Reitoria da Comunidade Universitária, Av. Paulo Gama, 110, 7^º andar, 90043 Porto Alegre, RS, Brasil. Send correspondence to F.I.F.C.

ABSTRACT

Inheritance of leaf angle was determined for four wheat (Triticum aestivum L.) genotypes with different leaf angles. Data were obtained at heading, anthesis, and milk stages of crop growth, in six generations from six different crosses. The six generations included the two parents (P₁ and P₂), F₁ and F₂, and backcrosses with each parent (BC₁F₁ and BC₂F₁). Genetic differences were detected among parental genotypes with erect leaves (PF 855520 and Parula's'), intermediate leaves (PF 85372) and pendent leaves (PF 83144). Heading and milk stage data were the most adequate for analysis of genetic parameters. Segregant data showed the existence of one gene with at least three distinct alleles controlling the expression of leaf angle, although the existence of two independent genes could not be ignored. Estimates of additive and dominance effects and heritability were significant. Data suggest that efficient selection for rect leaf in wheat is possible and that considerable genetic improvement can be expected for leaf angle.)

Keywords: Flag leaf angle; Wheat; Triticum aestivum.

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* Part of a thesis submitted by R.M.O.C. to Universidade Federal do Rio Grande do Sul in partial fulfillment of the requirements for the Master's degree.