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Ciencia e investigación agraria

versión On-line ISSN 0718-1620

Resumen

ABBOTT, Liliana A; PISTORALE, Susana M  y  FILIPPINI, Olga S. Análisis de coeficientes de sendero para el rendimiento de semillas en Bromus catharticus. Cienc. Inv. Agr. [online]. 2007, vol.34, n.2, pp. 141-149. ISSN 0718-1620.  http://dx.doi.org/10.4067/S0718-16202007000200007.

Over a two-year period, 13 genotypes of rescue grass were evaluated in a completely randomized design with six replications. The correlation coefficients and the path coefficient were analysed over nine characters related to seed production. Genotypic variability was significant for total seeds per panicle in the second year (p = 0.019), flag leaf length was significant in both years (p = 0.039 and 0.045, respectively), and the number of tillers per plant was significant in the first year (p = 0.003). For the rest of the characters, variability was highly significant (p ≤ 0.001). The relationship between genotype and the environment interaction was significant for the following characteristics: the number of tillers per plant (p = 0.003), the number of panicles per plant (p = 0.010), the width of the flag leaf (p = 0.010) and the 1000 seeds weight (p = 0.047). For the remaining characters, the interaction was not significant. Path coefficient analyses demonstrated that the total number of seeds per panicle and the number of spikelets per panicle were the main components that determined seed yield. The contribution of these components was influenced by other characters, such as panicle and flag leaf lengths. Therefore, these can be considered to be secondary yield components. The following four components: the number of total seeds per panicle, the number of spikelets per panicle, the panicle length and the flag leaf length rendered a total determination for this system that explained 83.36 % and 81.61 % of the phenotypic variation for the number of fully developed seeds per panicle each year

Palabras llave : Phenotypic correlation; rescue grass; yields components.

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