SciELO - Scientific Electronic Library Online

 
vol.72 número4Impacto del cambio climático en la composición de ácidos grasos del aceite de maní (Arachis hypogaea L.) de tres clases comercialesEfectos alelopáticos de fracciones acuosas y orgánicas de Euphorbia dracunculoides Lam. sobre la germinación y crecimiento de plántulas de garbanzo y trigo índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

Compartir


Chilean journal of agricultural research

versión On-line ISSN 0718-5839

Resumen

TOLLENAAR, Huib. Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study. Chilean J. Agric. Res. [online]. 2012, vol.72, n.4, pp.489-494. ISSN 0718-5839.  http://dx.doi.org/10.4067/S0718-58392012000400005.

To study the over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central Valley (CCV), temperature records from various locations in the CCV during the period 1950-2009 were examined for the occurrence of lethal maximum temperatures for the uredinia and uredinio-mycelium of this fungus. The lethal upper threshold temperature for the uredinial stage of P.s. tritici, estimated to be 40.5 °C on the basis of data published elsewhere, and the sum, accumulated during ten consecutive days, of the respective lethal temperature quotients (ALTQio), accounting for the partial lethal effect of the daily ambient temperatures between 30 and 40.5 °C on the uredinial stage of P.s. tritici, were used as yardsticks for thermal lethality. The results indicate that, in these 60 yr, the uredinia and the uredinio-mycelium of P.s. tritici could not possibly have over-summered at any of the locations studied. The Sierra Nevada Mountains, together with the Tulelake Basin and the coastal zone of the Pacific Ocean are the only two areas in California with appropriate environmental conditions for the summer-survival of the uredinial stage of stripe rust. Therefore, it is presumed that the inoculum for the initial infections of P.s. tritici in wheat fields in the CCV during the following growing season originates in either one or both of these areas, although, a potential third source of inoculum for the initial infections of stripe rust in the CCV could also be involved. Namely, the possible presence of telia with viable teliospores of P.s. tritici in autumn on straw of the threshed wheat fields or on volunteer wheat plants in the CCV, in conjunction with the accidental concurrence of nearby stripe rust susceptible barberry (Berberis spp.), could lead to the development of alternative, endogenous sources of inoculum in the CCV.

Palabras clave : Yellow rust; epidemiology; lethal temperature; Triticum aestivum.

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

 

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