Components of phenotypic variance of seed traits and germination characteristics of 20 ponderosa pine half-sib families
Componentes de varianza fenotípica de características de semilla y germinación de 20 familias de medios hermanos de pino ponderosa
DOI:
https://doi.org/10.54167/tch.v12i3.189Keywords:
tiempo para germinación, valor pico, parámetros Weibull, variación dentro de familiasAbstract
Se realizó un estudio para estimar componentes de varianza de características y vigor de 20 lotes de semilla de pino ponderosa. En familias de hermanos completos y medios hermanos la varianza dentro de grupos es elevada para la germinación y crecimiento de plántulas de coníferas. Algunas características de semilla pueden influir en la calidad del lote y la supervivencia de plántulas. Diez conos de polinización abierta fueron colectados de cada uno de 20 árboles madre, en una población localizada en Fort Defiance, Arizona. Semillas secadas al aire fueron sembradas en el laboratorio, en un diseño completamente aleatorizado, para estimar las componentes de varianza fenotípica de: peso (SW) y cubierta de la semilla (SCW); imbibición de la semilla (IMB), cinco características germinativas y tres parámetro de Weibull (a, b y c). Un 80 % de la semilla tuvo peso e» 41 mg y germinación e» 97 %. La varianza dentro de progenie/dentro de familia para las características SW (64.5 %) e IMB (70.4 %) fue mayor que la varianza entre familias (35.3 y 24.8 %, respectivamente). La varianza entre familias varió de 35.1 % (parámetro a de Weibull) a 62.3 % (Peak Value). Los resultados sugieren contribución materna y componente genética alta dentro de familias que influyen en la calidad y características germinativas de la semilla. Semillas con SW e» 60 mg y TOG=3, incrementaron 38.3 % de su peso por agua absorbida para alcanzar 50 % de germinación. Las semillas cuyo SW fue e» 45 mg and TOG = 7, mostraron un incremento de 102.2 % en SW antes de completar 50 % de germinación.
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References
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