Articles
SEARCH FOR RESISTANCE SOURCES TO BROWN ROT IN BRAZILIAN PEACH GENOTYPES
Article number
1084_29
Pages
211 – 216
Language
English
Abstract
The brown rot caused by Monilinia fructicola is the most important disease in Prunus species in places of hot and humid climate.
The development of resistant cultivars is a priority of breeding programs located in humid regions.
However, very few sources of good resistance level are known in spite of all the efforts.
This work aimed to evaluate the reaction of peach genotypes to M. fructicola. The study was conducted during the 2012/13 season, using a completely randomized design, with two replications of five fruit per plot.
Fruit at firm maturation stage (harvest point) of 174 genotypes, including, cultivars, selections and seedlings, were selected for absence of apparent damage and/or infection.
These fruits were dipped for 1 min in 70% alcohol, followed by a 5 min immersion in a 0.5% solution of NaClO. After a 10 min rest period they were washed in distilled water and placed in plastic transparent boxes (24.0 x 23.0 x 10.0 cm), lined with moistened filter paper.
The inoculation was made, by deposition of a 10µL drop suspension of 25,000 conidia mL-1 of the pathogen using an inoculation syringe.
Inoculated fruits were incubated at 25±1°C and 75% relative humidity for 72 hours.
After this period, the samples were evaluated for disease incidence (% of diseased fruits) and disease severity (average diameter of lesions and sporulation). The results were compared with the average lesion of cv. Bolinha, 0.9 cm (σ=0.9). The seedlings C. 2008.174.12 (Cascata 1062 × Marfim), C.2006.45.4 (Olimpia × SB 26), C.2009. 77.14 (Cascata 1510 × Libra), C.2008.161.126 and C.2008. 161.37 (Cascata 1062 × Maciel), C.2009. 173.33 and C.2009. 173.74 [(Olimpia × SB 26) OP] C. 2006 198.71 (Jubileu × Fu.
Sou.
Tao) and Sensação showed the same level of resistance to brown rot as Bolinha.
The development of resistant cultivars is a priority of breeding programs located in humid regions.
However, very few sources of good resistance level are known in spite of all the efforts.
This work aimed to evaluate the reaction of peach genotypes to M. fructicola. The study was conducted during the 2012/13 season, using a completely randomized design, with two replications of five fruit per plot.
Fruit at firm maturation stage (harvest point) of 174 genotypes, including, cultivars, selections and seedlings, were selected for absence of apparent damage and/or infection.
These fruits were dipped for 1 min in 70% alcohol, followed by a 5 min immersion in a 0.5% solution of NaClO. After a 10 min rest period they were washed in distilled water and placed in plastic transparent boxes (24.0 x 23.0 x 10.0 cm), lined with moistened filter paper.
The inoculation was made, by deposition of a 10µL drop suspension of 25,000 conidia mL-1 of the pathogen using an inoculation syringe.
Inoculated fruits were incubated at 25±1°C and 75% relative humidity for 72 hours.
After this period, the samples were evaluated for disease incidence (% of diseased fruits) and disease severity (average diameter of lesions and sporulation). The results were compared with the average lesion of cv. Bolinha, 0.9 cm (σ=0.9). The seedlings C. 2008.174.12 (Cascata 1062 × Marfim), C.2006.45.4 (Olimpia × SB 26), C.2009. 77.14 (Cascata 1510 × Libra), C.2008.161.126 and C.2008. 161.37 (Cascata 1062 × Maciel), C.2009. 173.33 and C.2009. 173.74 [(Olimpia × SB 26) OP] C. 2006 198.71 (Jubileu × Fu.
Sou.
Tao) and Sensação showed the same level of resistance to brown rot as Bolinha.
Publication
Authors
S. Scariotto, J. dos Santos, M.C.B. Raseira
Keywords
Monilinia fructicola, fruits, disease, plant breeding, ‘Bolinha’
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