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Article

Abscission of Orange Fruit (Citrus sinensis (L.) Osb.) in the Mediterranean Basin Depends More on Environmental Conditions Than on Fruit Ripeness

1
CIRAD, UMR AGAP, Avenue Agropolis-TA A-75/02, 34398 Montpellier CEDEX 5, France
2
Laboratoire GREEN-TEAM (LR17AGR01), Université de Carthage, INAT, 43, Avenue Charles Nicolle, Tunis 1082, Tunisia
3
INRAE, UMR AGAP Corse, Equipe SEAPAG, 20230 San Giuliano, France
4
IVIA, Carretera CV-315, Km. 10,7, 46113 Moncada (Valencia), Spain
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(4), 591; https://doi.org/10.3390/agronomy10040591
Received: 11 March 2020 / Revised: 10 April 2020 / Accepted: 17 April 2020 / Published: 21 April 2020
Orange fruit abscission usually occurs at the final stage of fruit maturation but in some areas of citrus production, in advance of the usual harvest period, and sometimes suddenly and intensely. The reasons for this precocious citrus fruit abscission remains unclear. Therefore, the aim of this study was to try to clarify what the determinants of this phenomenon are. A multi-site experimentation was carried out on six orange cultivars, in Corsica, Spain and Tunisia where the phenomenon of early massive fruit drop varies. Climatic parameters, fruit maturity parameters and fruit detachment force (FDF) were recorded along the fruit maturation period. Respectively to the fruit drop, the FDF decreased in Tunisia and in Spain until the fruit falls, whereas in Corsica, it remained relatively constant throughout fruit maturation. Although data on fruit maturity parameters (rind color, acidity and total soluble solids) differed at the three sites, their evolution was similar during the period of maturation. FDF was not related to changes in any fruit maturity parameters, and more likely depended on changes in temperatures on days when the mean temperature was above 13 °C. Massive fruit abscission could be linked to the earlier more rapid restart of vegetative growth in Tunisia and Spain than in Corsica. View Full-Text
Keywords: fruit detachment force; citrus color index; acidity; total soluble solids; growing degree days fruit detachment force; citrus color index; acidity; total soluble solids; growing degree days
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MDPI and ACS Style

Khefifi, H.; Selmane, R.; Ben Mimoun, M.; Tadeo, F.; Morillon, R.; Luro, F. Abscission of Orange Fruit (Citrus sinensis (L.) Osb.) in the Mediterranean Basin Depends More on Environmental Conditions Than on Fruit Ripeness. Agronomy 2020, 10, 591. https://doi.org/10.3390/agronomy10040591

AMA Style

Khefifi H, Selmane R, Ben Mimoun M, Tadeo F, Morillon R, Luro F. Abscission of Orange Fruit (Citrus sinensis (L.) Osb.) in the Mediterranean Basin Depends More on Environmental Conditions Than on Fruit Ripeness. Agronomy. 2020; 10(4):591. https://doi.org/10.3390/agronomy10040591

Chicago/Turabian Style

Khefifi, Hajer, Rim Selmane, Mehdi Ben Mimoun, Francisco Tadeo, Raphael Morillon, and François Luro. 2020. "Abscission of Orange Fruit (Citrus sinensis (L.) Osb.) in the Mediterranean Basin Depends More on Environmental Conditions Than on Fruit Ripeness" Agronomy 10, no. 4: 591. https://doi.org/10.3390/agronomy10040591

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