MEIOTIC IRREGULARITIES IN HEXAPLOID TRITICALE (TRITICOSECALE WITTMACK) - VARIABILITY ANALYSIS

Hexaploid Triticale heterogenity with meiotic irregularities is well known. The aim of this work was to assay genetic variability at two different levels: varietal and intravarietal. Varieties studied during the bi-annual period 85/86 were:Don Frank (DF) Cachirulo (C), Jenkins TA 203 (J), Don Santiago (DS) and Rosner (R). Study index was the number of healthy microspores as compared with micronuclei. It was found that DF, C and J were cytologically stable. During three years, 87,88 y 89, ten lines for each variety (DF and J), were assayed with different and opposite cytologic traits. In addition to the cytologic variable already mentioned, the number of seeds per spike and the main spike were assayed. Variance assay for cytologic index of these lines revealed significant differences only for DF variety. A significant and positive correlation between cytologic variation and the number of seeds per spike was observed.