Genetic of gibberellic acid insensibility in genotypes of wheat with different plant heights

Abstract

The inheritance of gibberellic acid insensibility in wheat (Triticum aestivum L.) was studied by genetic analysis of 21 crosses involving seven genotypes of different plant heights in all combinations. The analysis of the gibberellic acid response of P_l, P₂, F_l, F₂, F₃, RC₁F₁ e RC₂F₁ generations was realized in the greenhouse. The best isolation of the genotypes with different plant heights were obtained by the visual difference in the insertion of the second and first leaf, with 100 ppm of gibberellic acid. The genetic analysis permitted to identify one gene with complete dominance as responsable for the insensibility in the short-statured genotypes when compared with the tall ones. However, two different genes for gibberellic acid insensibility were identified in the genotypes with reduced plant heights, one gene was present in BTU and ALD and another gene was present in JUR and ANA.