SciELO - Scientific Electronic Library Online

 
vol.38 número3Desarrollo del fruto y semilla de Jatropha curcas L. e indicadores de madurez fisiológica de la semillaEfecto de la condición ambiental y la fertilización en el preacondicionamiento de Pinus engelmannii Carr. en vivero índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • No hay artículos similaresSimilares en SciELO

Compartir


Revista fitotecnia mexicana

versión impresa ISSN 0187-7380

Resumen

RUIZ-FARFAN, Daniel de G.; LOPEZ-UPTON, Javier; RAMIREZ-HERRERA, Carlos  y  RODRIGUEZ-TREJO, Dante A.. Reproductive phenology in a progeny test of Pinus greggii var. australis. Rev. fitotec. mex [online]. 2015, vol.38, n.3, pp.285-296. ISSN 0187-7380.

Seed orchards should provide sufficient seed at an early age with superior genetic quality and at regular intervals. Lack of flowering synchrony generates decrease in genetic diversity of the seed lot and a high percentage of abortive ovules and empty seeds. This work reports synchrony and temporal variation in floral phenology in a progeny test of Pinus greggii var. australis set at two sites in Central México: Cuautepec, Hidalgo and Terrenate, Tlaxcala. These tests turned into sexual seed orchards. Twenty-three half-sib families, with at least four trees per family per site, from five provenances were monitored for two years. Observations were conducted on the whole tree crown every two weeks from March to June of 2012, and twice a week between February and June of 2013 on 24 selected buds per tree, based on full crown, crown layers and branch orientation. Stages of strobili development were identified and the start and end dates of male and female flowering, and their durations were determined. Synchronization of flowering periods (PO0) was 0.31 in Terrenate 2012 and 0.34 in Cuautepec 2013, considered normal values taking in account the sexual origin of the test; however, in Cuautepec 2012 it was considerably high (0.57). All families showed some degree of synchronization with each other, except for Terrenate 2012. Flowering in Cuautepec was significantly earlier and longer than in Terrenate 2012. There was no female flowering, and male was very low in Terrenate 2013 which was associated with drought. Only significant variation between families was detected in Terrenate for most variables, and large variation within families. Significant differences between crown layers, but not for branch orientation in pollen dispersion were observed.

Palabras llave : Pinus greggii var. australis; floral phenology; pollen shedding; receptivity; seed orchard; synchronization.

        · resumen en Español     · texto en Español     · Español ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons