Defoliation and water leaf potential effects on oenological properties of Merlot (Vitis vinifera L.) grape must

Serkan Candar

Tekirdağ Viticulture Research Institute, 59200, Tekirdağ, Turkey

Elman Bahar

Tekirdağ Namık Kemal University, Faculty of Agriculture, Horticulture Department, 59100 Tekirdağ, Turkey

İlknur Korkutal

Tekirdağ Namık Kemal University, Faculty of Agriculture, Horticulture Department, 59100 Tekirdağ, Turkey

Fatma Betül Aktaş

Tekirdağ Namık Kemal University, Institute of Natural and Applied Sciences, 59100 Tekirdağ, Turkey


This research was carried out to determine the effects of leaf water potential and defoliation treatments on the oenological properties of grape must. Merlot/41B graft combination grapevines were cultivated in Chateau Kalpak vineyards in Tekirdağ, Şarköy. The trial was carried out for two consecutive years in the vineyard in the vegetation periods of 2019–2020 and 2020–2021. Leaf water potential treatments were S0 (Control = no irrigation), S1 (–0.3/–0.5 MPa), S2 (–0.5/–0.7 MPa) and S3 (<–0.7 MPa) and defoliation treatments were implemented as; Control(C), Full Window(FW), Right Window(RW) and Left Window (LW). As a result, the S2 (–0.5 MPa and –0.7 MPa) stress level resulted in more balanced responses, as seen in the combination of years in terms of both primary and secondary metabolites. The RW defoliation treatment may cause higher primary and secondary metabolite values in all criteria.


abiotic stress, berry maturity, berry quality, canopy management, leaf removal

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Serkan Candar 
Tekirdağ Viticulture Research Institute, 59200, Tekirdağ, Turkey
Elman Bahar 
Tekirdağ Namık Kemal University, Faculty of Agriculture, Horticulture Department, 59100 Tekirdağ, Turkey
İlknur Korkutal 
Tekirdağ Namık Kemal University, Faculty of Agriculture, Horticulture Department, 59100 Tekirdağ, Turkey
Fatma Betül Aktaş 
Tekirdağ Namık Kemal University, Institute of Natural and Applied Sciences, 59100 Tekirdağ, Turkey


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