Transmisión de Trichoconiella padwickii a coleóptilos de arroz

Abstract

RESUMENEl hongo Trichoconiella padwickii es uno de los principales patógenos de la semilla de arroz en la provincia de Corrientes, Argentina. Con el objetivo de cuantificar la eficiencia de transmisión (ET) desde la semilla a coleóptilos de arroz se realizó un ensayo "in vivo", utilizando semillas de las variedades BRS Taim, Puitá Inta-CL e Irga 424. Las semillas se sembraron en bandejas plásticas conteniendo arena estéril como sustrato e incubadas en laboratorio en condiciones de 25 ± 2ºC y fotoperiodo de 12 h. La ET se evaluó a los siete días, sobre 400 coleóptilos sembrados en medio agar poroto 3%. El patógeno presentó los siguientes valores de ET: 7% para la variedad BRS Taim; 28,5% en Puitá Inta-CL y 8,1% en la variedad Irga 424. Se demostró la importancia de la semilla como fuente de inóculo de T. padwickii. Palabras-claves: Oryza sativa, fuente de inóculo, semillas. ABSTRACT Transmission of Trichoconiella padwickii to rice coleoptilesThe fungus Trichoconiella padwickii is one of the main pathogens of rice seed in the province of Corrientes, Argentina. With the objective of quantifying the transmission efficiency (TE) from rice seed to coleoptiles, a trial was conducted "in vivo" using seeds of the varieties BRS Taim, Puitá Inta-CL and Irga 424. Seeds were sown in plastic trays containing sterile sand as substrate and incubated in laboratory conditions at 25±2ºC and photoperiod of 12 h. The TE was evaluated after seven days using 400 coleoptiles put on agarbean medium 3%. The TE was 7%, 28.5% and 8.1% for varieties BRS Taim, Puitá Inta-CL and Irga 424, respectively, demonstrating the importance of seeds as an inoculum source of T. padwickii.

Modelling of the effects of environmental factors on rice grain discoloration incidence in Corrientes province, Argentina

“…Although A. padwickii was found in only 68.8% of the samples analysed, it was the fungus most frequently isolated (14.2%). Our results partially agree with those published by Gutiérrez et al (2002), who informed 75% P and 1.25% I of A. padwickii in samples collected in Corrientes province, as well as with those of Lovato Echeverría et al (2013), who reported that A. padwickii is one of the most important seed pathogens in the north‐eastern region of Argentina, due to its P and I in rice seed samples. A. padwickii participation in the RGD complex seems to be variable according to the region, since some authors such as those above mentioned, Soave et al (1985) and Ibrahim and Abo El‐Dahab (2014) consider it as a predominant pathogen, while others, e.g.…”

Influência Do Potencial De Inóculo De Exserohilum Rostratum Na Transmissão Semente-Plântula Em Arroz / Influence of Inoculum Potential of Exserohilum Rostratum on Seed-Seedling Transmission in Rice

“…Elevadas taxas de transmissão também foram observadas em outros patógenos associados as sementes de arroz como B. oryzae com percentuais de até 100% (Malavolta et al, 2002;Cardoso;2012); Curvularia lunata com 25 a 64% de (Silva et al, 2014), e Trichoconiella padwickii (Alternaria padwickii) entorno de 50% (Farias et al, 2007), considerando que nos mesmo foram avaliados diferentes fatores como níveis de incidência do patógeno, época de crescimento da plântula, cultivar, etc.…”

Hongos Asociados Al Manchado Del Grano Del Arroz: Una Revisión

“…Las semillas desempeñan un papel importante en la transmisión de patógenos, que pueden localizarse en lema, pálea, pericarpio y endospermo (Echeverría et al, 2013). La sobrevivencia de patógenos en semilla depende de la variedad, vigor, inóculo, condiciones ambientales, tipo de suelo, pH del suelo, proceso productivo, entre otros (Ghosh et al, 2018).…”