Abstract

PEREIRA, José Almeida; MORAIS, Orlando Peixoto de  and  BRESEGHELLO, Flávio. Heterosis analysis in crosses among red rice varieties. Pesq. agropec. bras. [online]. 2008, vol.43, n.9, pp. 1135-1142. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2008000900006.

The objective of this work was to evaluate, using the diallelic analysis, the potential of ten varieties of red rice for the implementation of a breeding program. The identification of parents was performed with ten lendraces was performed with in a complete diallel crossing without reciprocals. The varieties and their 45 diallel crosses were evaluated in generations F₁ and F₃ for agronomic traits in a randomized block design. For the yield character, the following characteristics were evaluated: varietal effect, varietal heterosis and specific heterosis in each generation, plus the general combining ability. Significant differences among parents for the traits evaluated were detected; and the crosses 'AL03/PB13' and 'PB05/PB10' were considered the most promising for selection of elite lines of red rice for the favorable parameter estimates related to yield, genetic diversity and combining ability of their parents.

Keywords : Oryza sativa; country rice; combining ability; rice breeding; hybrid vigor.