Resumo

SCHIERENBECK, M; FLEITAS, M.C; GOLIK, S. I  e  SIMON, M.R. Generación de biomasa y rendimiento en trigo frente a infecciones de Puccinia triticina y Pyrenophora tritici-repentis. FAVE. Secc. Cienc. agrar. [online]. 2015, vol.14, n.2. ISSN 1666-7719.

Wheat biomass and yield generation under Puccinia triticina and Pyrenophora tritici-repentis infections The present study was designed to determine the effects of inoculations of foliar disease pathogens with different nutritional habits: Pyrenophora tritici-repentis (necrothroph -PTR-) and Puccinia triticina (biotroph -LR-) on the physiological components of biomass generation, like absorbed photosynthetic active radiation (APAR) and radiation use efficiency (RUE), and on the yield production in wheat. Field experiments were carried out in 2012-2013 at FCAyF-UNLP using a split-split-plot design with three replications. The main plots were the pathogen inoculations. Subplots were inoculation treatments: 1- Without inoculation, 2- Low dose of spores concentration inoculation, 3- High dose of spores concentration. Ten cultivars were the sub-subplots. Foliar diseases decreased biomass production mainly explained by reductions in green leaf area, healthy area duration and reductions on APAR, showing higher declines under PTR inoculations. A detrimental effect in the RUE was detected at LR inoculations, which could be associated with the nutritional habit of the pathogen.

Palavras-chave : Biomass; Radiation use efficiency; Radiation absorption; Foliar diseases; Wheat.

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