Physiological and Biochemical Responses of Orange Trees to Different Deficit Irrigation Regimes

The article presents the results of research consisting of the application of deficit irrigation (DI) criteria, combined with the adoption of micro-irrigation methods, on orange orchards (Citrus sinensis (L.) Osbeck) in Sicily (Italy) during the irrigation season of 2015. Regulated deficit irrigatio...

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Bibliographic Details
Published in:Plants (Basel) 2019-10, Vol.8 (10), p.423
Main Authors: Puglisi, Ivana, Nicolosi, Elisabetta, Vanella, Daniela, Lo Piero, Angela Roberta, Stagno, Fiorella, Saitta, Daniela, Roccuzzo, Giancarlo, Consoli, Simona, Baglieri, Andrea
Format: Article
Language:English
Subjects:
Abscisic acid
Agricultural production
Citrus fruits
citrus orchards
Citrus sinensis
crop physiology
Crop production
Crops
deficit irrigation
Drying
electrical resistance
Electrical resistivity
Flowers & plants
Food preservation
Fruit trees
Fruits
geophysical surveys
geophysics
Investigations
Irrigation
irrigation rates
Italy
Leaves
microirrigation
Orchards
physiological response
Physiology
root zone drying
roots
Sicily
soil
Soils
surveys
tomography
Trees
water deficit
Water stress
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Summary:The article presents the results of research consisting of the application of deficit irrigation (DI) criteria, combined with the adoption of micro-irrigation methods, on orange orchards (Citrus sinensis (L.) Osbeck) in Sicily (Italy) during the irrigation season of 2015. Regulated deficit irrigation (RDI, T3) and partial root-zone drying (PRD, T4) strategies were compared with full irrigation (T1) and sustained deficit irrigation (SDI, T2) treatments in terms of physiological, biochemical, and productive crop response. A geophysical survey (electrical resistivity tomography, ERT) was carried out to identify a link between the percentages of drying soil volume in T4 with leaves abscisic acid (ABA) signal. Results highlight that the orange trees physiological response to water stress conditions did not show particular differences among the different irrigation treatments, not inducing detrimental effects on crop production features. ABA levels in leaves were rather constant in all the treatments, except in T4 during late irrigation season. ERT technique identified that prolonged drying cycles during alternate PRD exposed more roots to severe soil drying, thus increasing leaf ABA accumulation.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants8100423