PRELIMINAR EVALUATION OF PEA (Pisum sativum L.) RESISTANCE TO ROOT ROT DISEASES IN SOUTH OF SANTA FE

ESPÓSITO MA; LAGO, M.E.;; SPITTELER L; GATTI I; SCANDIANI M; LUQUE A; COINTRY E

ROSARIO BIOLOGY SOCIETY

Universidad Nacional de Rosario

Año: 2018 vol. 42 p. 1 - 47

1667-5746

The south of Santa Fe and north of Buenos Aires occupy the largest area planted with peas in Argentina. The evaluation of different materials in naturally infested soils, allows knowing their behavior against soil pathogens causing root rot disease in a preliminary way. The objective of the present work was to explore the behavior and presence of potential sources of resistance to Fusarium sp. in materials of the breeding program of FCA-UNR. Soil samples in patches that had previously exhibited affected plants were taken from a plot with root rot diseases history caused by Fusarium sp. in pea. Samples were homogenized to obtain a substrate with uniform natural infestation and then used to sow 9 materials in the greenhouse in two substrates (naturally infested and sterile), 2 repetitions of one pot each with 4 seeds / pot. The evaluated traits were emergence percentage (%E), total number of nodes per plant (NTP) and number of symptomatic nodes per plant (NSP). Proportion of symptomatic nodes per plant (PNAP) was determined for infested (i) and sterile (e) substrates, and the index PNAPe/PNAPi was calculated. An ANOVA was performed. Chinesse P. and VIR2524 materials had the lowest %E, with 56% each, but not significant differences among materials were found for NTP and PNAP. Nevertheless, descriptive analysis of results showed a differential behavior pattern for PNAP. The index allowed categorizing the materials according to their behavior. Ervilha showed a value close to one while Viper and Multifreezer were the most affected materials, in concordance with the passport data of the donor Germplasm Bank in respect to reaction to Fusarium. In conclusion, it stands up the importance of deepening the exploratory studies in order to select a set of promising materials on which to evaluate the resistance to Fusarium sp. and other specific pathogens.