ACUÑA Carlos Alberto
congresos y reuniones científicas
GENETIC STRUCTURES IN THE EVALUATION OF PHYSIOLOGICAL TRAITS FOR WARMSEASON GRASSES
CARLOS A. ACUÑA
Congreso; XXXI Reunión Argentina de Fisiología Vegetal; 2016
Sociedad Argentina de Fisiología Vegetal
Warm-season grasses are highly diverse in terms of modes of reproduction and genetic structures, and this variation has a marked effect on theevaluation of physiological traits. The low growing rate of these grasses during the cool-season in subtropical Argentina represents one of the mostimportant limitations for beef-cattle production. The forage breeding program of Facultad de Ciencias Agrarias, Universidad Nacional delNordeste, has the objective of decreasing this ?dormancy? period by selecting for photoperiod insensitive and cold tolerant hybrids andpopulations. The experimental design, evaluation and data analyses for these two traits are highly related with the genetic structures of the plantmaterial. The most important warm-season perennial grasses reproduce by apomixis. The complexity of the evaluation and selection of apomictic species relates to the fact that different genetic structures are present in different parts of the breeding process. In this presentation, the case of the genus Paspalum is discussed since the diversity for modes of reproduction allows for an in depth analysis of the relation between genetic structures and the evaluation of seasonal growing patterns and related traits.