Relación entre el gen Rps 1k y la resistencia a Pythium ultimum y P. irregulare en soja

Abstract

En el cultivo de soja Pythium spp. produce la pudrición de semillas y raíces, y "damping off". El objetivo del presente trabajo fue verificar la relación entre el gen Rps 1k de resistencia a Phytophthora sojae y P. ultimum y P. irregulare. Cuatro genotipos de soja, dos con el gen Rps 1k (SE+1y SE+2) y dos sin el gen (SE-1 y SE-2) se sembraron en suelo inoculado y sin inocular. Los genotipos SE-1 y SE-2 no difirieron entre sí, ya sea que estuviesen inoculados o no, ni tampoco difirieron del SE+2. En cambio, los genotipos Grijalba, P.E.; Ridao, A. C.; Steciow, M.; López, M.V.. Relación entre el gen Rps 1k y la resistencia a Pythium ultimum y P. irregulare en soja Summa Phytopathologica, v.43, n.2, p.94-97, 2017. Palabras claves:Oomycetes; Damping off; Glycine max; Phytophthora sojae RESUMEN con el gen Rps1k difirieron entre sí, tanto los que estuvieron inoculados como los no inoculados. SE+2 presentó un 95% de emergencia mientras que SE+1 presentó un 78.35% de emergencia pero en ambos casos la emergencia disminuyó cuando se inoculó, con 63.35% y 34.15% respectivamente. Bajo las condiciones del presente ensayo las variedades utilizadas conteniendo el gen Rps 1k a Ph. sojae no presentaron mayor número de plántulas emergidas frente a las cepas probadas de P. ultimum ni de P. irregulare. ABSTRACTIn soybean Pythium spp. produces seed and root rot and "damping off". The aim of this study was to verify the relationship between resistant gene Rps 1k to Phytophthora sojae with Pythium ultimum and P. irregulare. Four genotypes of soybean were sown on inoculated soil, two of them with gene Rps 1k and the other two without it. Genotypes without the gene did not differ among themselves, no matter whether they were inoculated or not. On the other Grijalba, P.E.; Ridao, A. C.; Steciow, M.; López, M.V.. Relationship between Rps 1k gene and resistance to Pythium ultimum and P. irregulare in soybean. Summa Phytopathologica, v.43, n.2, p.94-97, 2017. hand, Rps1k genotypes differed from each other, whether or not they were inoculated. SE+2 presented 95% of emergence whereas SE+1 presented 78.35% of emergence, but in both cases the emergence decreased when genotypes were inoculated with 63.35% and 34.15% respectively. Under the assayed conditions the gene Rps1k resistant to Ph. sojae did not show a greater number of emerged seedlings against the tested strains of P. ultimum or P. irregulare. Keywords: Oomycetes; Damping off; Glycine max ; Phytophthora sojaeEm soja Pythium spp. causa apodrecimento de sementes, da raiz e "tombamento". O objetivo deste estudo foi verificar a relação do gene de resistência Rps 1k de Phytophthora sojae com Pythium ultimum e P. irregulare. Quatro genótipos de soja foram semeados em solo inoculado ou não com Pythium spp, dois deles com o gene Rps 1k (SE+1 e SE+2) e os outros dois sem ele (SE-1 e SE-2). Os genótipos SE-1 e SE-2 não diferiram entre si, não importa se eles foram inoculados ou não, nem eram diferentes de SE + 2. Por Grijalba, P.; Ridao, A. C.; Steciow, M.; López, M.V.. Relação entre gene e re...

Efficiency of Marine Bacteria and Yeasts on the Biocontrol Activity of Pythium ultimum in Ancho-Type Pepper Seedlings

“…B. subtilis RBM02 protected 100% of the plants from the oomycete, and an increase was quantified in all the growth parameters and CFU. The use of these marine bacteria and yeasts are, therefore, an option for P. ultimum biocontrol in ancho-type pepper plants, thereby minimizing the application of synthetic fungicides.Agronomy 2020, 10, 408 2 of 12 by immediate infection makes management of this phytopathogen very difficult [7]. Several Pythium species, including P. aphanidermatum, P. irregular, and P. ultimum, are known to cause damping-off and root rot diseases in pepper [8][9][10].…”

“…Agronomy 2020, 10, 408 2 of 12 by immediate infection makes management of this phytopathogen very difficult [7]. Several Pythium species, including P. aphanidermatum, P. irregular, and P. ultimum, are known to cause damping-off and root rot diseases in pepper [8][9][10].…”