1. Path coefficient analysis for seed yield in Bromus catharticus
- Author
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Olga Susana Filippini, Susana M. Pistorale, and Liliana A. Abbott
- Subjects
Fully developed ,Horticulture ,biology ,Botany ,Path coefficient ,Bromus ,biology.organism_classification ,Completely randomized design ,Panicle - Abstract
Over a two-year period, 13 genotypes of rescue grass ( Bromus catharticus ) 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. Trece genotipos de Bromus catharticus (cebadilla criolla) fueron evaluados para rendimiento en semilla en 2001 y 2002, usando un diseno completamente aleatorizado con seis repeticiones por genotipo. Se analizaron las correlaciones y el coeficiente de sendero para nueve caracteres relacionados con la produccion de semilla. La variabilidad genotipica fue estadisticamente significativa para numero de semillas totales por panoja en el segundo ano (p = 0,019), largo de hoja bandera en los dos anos (p = 0,039 y 0,045) y numero de macollos por planta en el primer ano (p = 0,003). La interaccion genotipo x ambiente fue significativa para numero de macollos por planta (p = 0,003), numero de panojas por planta (p = 0,010), ancho de hoja bandera (p = 0,010) y peso de 1000 semillas (p = 0,047). El analisis de coeficientes de sendero mostro que el numero de semillas totales el numero de espiguillas por panoja fueron los componentes principales que determinaron el rendimiento en semilla. La contribucion de estos componentes dependio de otros caracteres, tales como largo de panoja y largo de hoja bandera. Estos ultimos caracteres se pueden considerar componentes secundarios del rendimiento. El sistema con cuatro componentes representado por el numero de semillas totales, numero de espiguillas, y largo de panoja mas el largo de hoja bandera explico el 83,36 y 81,61% de la variacion fenotipica para el numero de semillas llenas por panoja en los dos anos de estudio.
- Published
- 2007