Methyl jasmonate and CMN-pyrazole applied alone and in combination can cause mature orange abscission |
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| Institution: | 1. Department of Rural Engineering, College of Agricultural Sciences, São Paulo State University, Rua José Barbosa de Barros, n. 1780, Portaria II, CEP: 18610-307, Botucatu, São Paulo, Brazil;2. Center of Technological Development, Water Resources Engineering, Federal University of Pelotas, Campus Porto, Rua Gomes Carneiro, n. 01, CEP: 96010-610, Pelotas, Rio Grande do Sul, Brazil;3. Department of Rural Engineering, Faculty of Agronomy, Federal University of Pelotas, Campus Universitário s/n, CEP: 96010-900, Capão do Leão, Rio Grande do Sul, Brazil;4. Embrapa – Brazilian Agricultural Research Corporation, BR392, Km 78, CEP: 96001-970, Pelotas, Rio Grande do Sul, Brazil;5. Faculty of Agronomy, Federal University of Pelotas, Campus Universitário s/n, CEP: 96010-900, Capão do Leão, Rio Grande do Sul, Brazil;1. Centre of Molecular and Environmental Biology, Department of Biology, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal;2. Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal;3. Laboratory for Flavor Analysis and Enology, Instituto Agroalimentario de Aragón (IA2), Department of Analytical Chemistry, Faculty of Sciences, Universidad de Zaragoza, E-50009 Zaragoza, Spain;4. Centre of Biological Engineering (CEB), Department of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal;1. IRTA Fruitcentre, PCiTAL, Park of Gardeny, Fruitcentre Building, 25003, Lleida, Spain;2. Dept. of Horticulture, NYSAES, Cornell University, Geneva, NY, 14456, USA;3. IRTA Mas Badia Field Station, La Tallada de l’Empordà, Girona, 17134, Spain;1. IRTA Fruitcentre, PCiTAL, Park of Gardeny, Fruitcentre Building, 25003, Lleida, Spain;2. IRTA Mas Badia Field Station, La Tallada de l’Empordà, Girona, 17134, Spain;3. HBJ Department, ETSEA, University of Lleida, Alcalde Rovira Roure 191, 25198, Lleida, Spain;4. ADAMA AGRICULTURE ESPAÑA S.A Mendez Alvaro, 20, 5º, Madrid, 28045, Spain |
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| Abstract: | Methyl jasmonate (MJ) and CMN-pyrazole alone and in combination were applied to ‘Hamlin’ and ‘Valencia’ orange trees (Citrus sinensis (L.) Osbeck) in seven separate experiments in the 1998/1999 and 1999/2000 growing seasons to induce abscission of mature fruit for mechanical harvesting. MJ alone significantly reduced fruit detachment force (FDF) of ‘Hamlin’ oranges at concentrations of 10 mM and higher. However, MJ at 20 and 100 mM caused significant defoliation. For ‘Hamlin’ oranges, the most effective treatments were those combining 10 mM MJ and 50 mg l?1 CMN-pyrazole, and 20 mM MJ and 25 mg l?1 CMN-pyrazole. ‘Valencia’ oranges did not respond to 10 mM MJ treatments alone or in combination with CMN-pyrazole, and required MJ at 20 mM in combination with CMN-pyrazole to loosen this late-maturing variety to below 50 N, but excessive defoliation occurred. |
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