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Journals / Yüzüncü Yıl Üniversitesi Tarım Bilimleri Dergisi / 2026 / Issue: 1

Effects of Leaf Removal at Different Phenological Stages on Yield, Quality, and Growth of Karaerik Grapevines Trained in the Baran System

Tevhit Geçim(Bahçe Kültürleri Araştırma Enstitüsü Müdürlüğü)0000-0003-2406-9929
Abdurrahim Bozkurt(Bahçe Kültürleri Araştırma Enstitüsü Müdürlüğü)0000-0001-7315-202X
Nalan Nazan Kalkan(Bahçe Kültürleri Araştırma Enstitüsü Müdürlüğü)0000-0002-9204-7281
Pages
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Publication Date
2026-06-08
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Overall, basal leaf removal at full flowering emerged as an effective vineyard management strategy to improve fruit quality, enhance phytochemical accumulation, and increase winter bud cold tolerance in Karaerik grapes cultivated under the Baran training system.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This study evaluated the effects of basal leaf removal at different phenological stages on yield, fruit quality, phytochemical composition, and winter bud physiology of the Karaerik grape cultivar under the Baran training system.
📊
Key Findings & Data:The experiment was carried out over two consecutive growing seasons (2023 and 2024) using a randomized block design.
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Conclusion & Impact:Overall, basal leaf removal at full flowering emerged as an effective vineyard management strategy to improve fruit quality, enhance phytochemical accumulation, and increase winter bud cold tolerance in Karaerik grapes cultivated under the Baran training system.
🔬Design:Research Article
📍Scope:2023 Verileri
⚙️Variables:Leaf removal · Yield components · Phenological stage

Abstract

This study evaluated the effects of basal leaf removal at different phenological stages on yield, fruit quality, phytochemical composition, and winter bud physiology of the Karaerik grape cultivar under the Baran training system. Basal leaf removal was applied by removing five basal leaves at full flowering, pea-size berry, and veraison, and compared with an untreated control. The experiment was carried out over two consecutive growing seasons (2023 and 2024) using a randomized block design. The timing of leaf removal significantly influenced yield components and berry characteristics. Control vines produced the highest fresh grape yield (8.98 kg vine⁻¹), whereas vines defoliated at full flowering showed a moderate yield reduction (7.43 kg vine⁻¹). Despite this reduction, full flowering treatment substantially decreased cluster compactness (OIV-204: 4.58) compared with the control (7.58) and reduced the incidence of cracked and decayed berries by approximately 80%. Early defoliation also promoted berry growth, resulting in the highest single berry weight (5.91 g). Technological maturity parameters were positively affected by early leaf removal. The full flowering treatment resulted in the highest total soluble solids (19.07%), maturity index (27.42), and total phenolic content (504.57 mg L⁻¹). Moreover, leaf removal at full flowering and at pea-size berry significantly increased soluble carbohydrate concentrations in winter buds and reduced primary bud cold injury and necrosis. Overall, basal leaf removal at full flowering emerged as an effective vineyard management strategy to improve fruit quality, enhance phytochemical accumulation, and increase winter bud cold tolerance in Karaerik grapes cultivated under the Baran training system.

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Cite This Article

Geçim, T., Bozkurt, A., Kalkan, N. N. (2026). Effects of Leaf Removal at Different Phenological Stages on Yield, Quality, and Growth of Karaerik Grapevines Trained in the Baran System. Yüzüncü Yıl Üniversitesi Tarım Bilimleri Dergisi, Issue: 1. https://doi.org/10.29133/yyutbd.1861975

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References (60)

  1. Bal, E., Kök, D., & Çelik, S. (2011). The effect of some post-harvest treatments on Kozak black grape variety. Journal of Tekirdag Agricultural Faculty, 8(2), 65–76.
  2. Bennett, J., Jarvis, P., Creasy, G. L., & Trought, M. C. (2005). Influence of defoliation on overwintering carbohydrate reserves, return bloom, and yield of mature Chardonnay grapevines. American Journal of Enology and Viticulture, 56(4), 386–393. https://doi.org/10.5344/ajev.2005.56.4.386
  3. Cantürk, S. (2026). Determination of generative performance of some Turkish hybrid grape cultivars (Vitis vinifera L.) in Çukurova conditions. ISPEC Journal of Agricultural Sciences, 10(1), 153-165. https://doi.org/10.5281/zenodo.18347684
  4. Chorti, E., Guidoni, S., Ferrandino, A., & Novello, V. (2010). Effect of different cluster sunlight exposure levels on ripening and anthocyanin accumulation in Nebbiolo grapes. American Journal of Enology and Viticulture, 61(1), 23–30. https://doi.org/10.5344/ajev.2010.61.1.23
  5. Çelik, H., Ağaoğlu, Y. S., Fidan, Y., Marasalı, B., & Söylemezoğlu, G. (1998). Genel bağcılık. Sunfidan A.Ş.
  6. Doğan, A., Uyak, C., & Saday, M. (2017). Ampelographic characterization of local grape varieties grown in the Hizan (Bitlis) region. Yuzuncu Yıl University Journal of Agricultural Sciences, 27(3), 424–435.
  7. English, J. T., Thomas, C. S., Marios, J. J., & Gubler, W. D. (1989). Microclimates of grapevine canopies associated with leaf removal and control of Botrytis bunch rot. Phytopathology, 79, 395–401. https://doi.org/10.1094/Phyto-79-395
  8. Feng, H., Yuan, F., Skinkis, P. A., & Qian, M. C. (2015). Influence of cluster zone leaf removal on Pinot noir grape chemical and volatile composition. Food Chemistry, 173, 414–423. https://doi.org/10.1016/j.foodchem.2014.09.149
  9. Fennell, A., & Hoover, E. (1991). Photoperiod influences growth, bud dormancy, and cold acclimation in Vitis labruscana and V. riparia. Journal of the American Society for Horticultural Science, 116(2), 270–273. https://doi.org/10.21273/JASHS.116.2.270
  10. Gambacorta, G., Faccia, M., Natrella, G., Noviello, M., Masi, G., & Tarricone, L. (2022). Early basal leaf removal at different sides of the canopy improves the quality of Aglianico wine. Foods, 11(19), 3140. https://doi.org/10.3390/foods11193140
  11. Gatti, M., Bernizzoni, F., Civardi, S., & Poni, S. (2012). Effects of cluster thinning and preflowering leaf removal on growth and grape composition in cv. Sangiovese. American Journal of Enology and Viticulture, 63(3), 325-332. https://doi.org/10.5344/ajev.2012.11118
  12. Geçim, T., Doğan, N. Y., Pinar, H., & Bozkurt, A. (2025). Assessment of the susceptibility of grapevine genotypes in the Eastern Anatolia Region genetic resource plot to powdery mildew (Erysiphe necator) under natural infection conditions. Turkish Journal of Agricultural and Natural Sciences, 12(2), 368–378. https://doi.org/10.30910/turkjans.1603167
  13. Gökçen, İ. S., Çelik, M., & Keskin, N. (2026). Time-dependent changes in photosynthetic and phenolic responses in ‘Horoz Karası’ grape variety exposed to UV-B stress. ISPEC Journal of Agricultural Sciences, 10(1), 263-274. https://doi.org/10.5281/zenodo.18692291
  14. Hed, B., & Centinari, M. (2024). Mechanical leaf removal for improved Botrytis bunch rot control in Vitis vinifera ‘Pinot gris’ and ‘Pinot noir’ grapevines in the Northeastern United States. Plant Disease, 108(10), 3156–3162. https://doi.org/10.1094/PDIS-02-24-0383-RE
  15. Howell, G. S., & Shaulis, N. (1980). Factors influencing within-vine variation in the cold resistance of cane and primary bud tissues. American Journal of Enology and Viticulture, 31(2), 158–161. https://doi.org/10.5344/ajev.1980.31.2.158
  16. Hunter, J. J., de Villiers, Q. T., & Watts, J. E. (1991). The effect of partial defoliation on quality characteristics of Vitis vinifera L. cv. Cabernet Sauvignon grapes: Sugars, acids and pH. South African Journal of Enology and Viticulture, 12(1), 42–50. https://doi.org/10.5344/ajev.1991. 42.1.13
  17. Intrieri, C., Filippetti, I., Allegro, G., Centinari, M., & Poni, S. (2008). Early defoliation (hand vs mechanical) for improved crop control and grape composition in Sangiovese (Vitis vinifera L.). Australian Journal of Grape and Wine Research, 14(1), 25–32. https://doi.org/10.1111/j.1755-0238.2008.00004.x
  18. Kalkan, N. N., Kiracı, M. A., Kadıoğlu, Z., & Esmek, İ. (2024). Economic analysis of baran system and some cord training systems in Erzincan conditions. Bahçe Journal, 53(Special Issue 1), 81-86. https://doi.org/10.53471/bahce.1481897
  19. Karadoğan, B., Kalkan, N. N., Kaya, O., Bozkurt, A., & Geçim, T. (2022). A training system specific to ecology and variety:" Baran. Chapters On Viticulture, 155-168.
  20. Kaya, O. (2020). Defoliation alleviates cold-induced oxidative damage in dormant buds of grapevine by up-regulating soluble carbohydrates and decreasing ROS. Acta Physiologiae Plantarum, 42(7), 106. https://doi.org/10.1007/s11738-020-03093-1
  21. Köse, B., Çelik, H., & Çelik, D. (2018). Determination of the effects of less and excessive leaf removal on cluster characteristics in" Trakya ilkeren" grape variety.
  22. Keller, M. (2015). The science of grapevines (2rd ed.). Academic Press.
  23. Keller, M. (2020). The science of grapevines (3rd ed.). Academic Press.
  24. Kılıç, M. S. (2019). Effects of some summer pruning practices on fruit yield and quality in Red Globe grape variety. (Master's thesis), Isparta University of Applied Sciences, Isparta, Türkiye.
  25. Kliewer, M., & Bledsoe, A. (1986). Influence of hedging and leaf removal on canopy microclimate, grape composition, and wine quality under California conditions. In Proceedings of the Symposium on Grapevine Canopy and Vigor Management (pp. 157–168). https://doi.org/10.17660/ActaHortic.1987.206.9
  26. Koblet, W., Candolfi-Vasconcelos, M. C., Zweifel, W., & Howell, G. S. (1994). Influence of leaf removal, rootstock, and training system on yield and fruit composition of Pinot noir grapevines. American Journal of Enology and Viticulture, 45(2), 181-187. https://doi.org/10.5344/ajev.1994.45.2.181
  27. Korkutal, İ., Bahar, E., & Bayram, S. (2018). Effects of different soil tillages and leaf removal applications on shoot and leaf characteristics and water stress of cv. Syrah. Journal of Tekirdag Agricultural Faculty, 15(1), 1-13.
  28. Lee, J., & Skinkis, P. A. (2013). Oregon ‘Pinot noir’ grape anthocyanin enhancement by early leaf removal. Food Chemistry, 139(1–4), 893–901. https://doi.org/10.1016/j.foodchem.2013.02.022
  29. Martínez-Lüscher, J., Morales, F., Delrot, S., Sánchez-Díaz, M., Gomès, E., Aguirreolea, J., & Pascual, I. (2013). Short-and long-term physiological responses of grapevine leaves to UV-B radiation. Plant Science, 213, 114-122. https://doi.org/10.1016/j.plantsci.2013.08.010
  30. Matthews, M. A. (2016). Terroir and other myths of winegrowing. Univ of California Press.
  31. Lorenz, D. H., Eichhorn, K. W., Bleiholder, H., Klose, R., Meier, U., & Weber, E. (1995). Growth stages of the grapevine: Phenological growth stages of the grapevine (Vitis vinifera L. ssp. vinifera)—Codes and descriptions according to the extended BBCH scale. Australian Journal of Grape and Wine Research, 1(2), 100–103. https://doi.org/10.1111/j.1755-0238.1995.tb00085.x
  32. Mills, L. J., Ferguson, J. C., & Keller, M. (2006). Cold-hardiness evaluation of grapevine buds and cane tissues. American Journal of Enology and Viticulture, 57(2), 194-200. https://doi.org/10.5344/ajev.2006.57.2.194
  33. OIV. (2009). OIV descriptor list for grape varieties and Vitis species. Organisation Internationale de la Vigne et du Vin.
  34. Palliotti, A., Cini, R., Silvestroni, O., Leoni, F., & Poni, S. (2012). Effects of late mechanized leaf removal above the clusters zone to delay grape ripening in'Sangiovese'vines. In I International Workshop on Vineyard Mechanization and Grape and Wine Quality 978 (pp. 301-307). https://doi.org/10.17660/ActaHortic.2013.978.35
  35. Parker, A. K., Hofmann, R. W., Van Leeuwen, C., McLachlan, A. R., & Trought, M. C. (2015). Manipulating the leaf area to fruit mass ratio alters the synchrony of total soluble solids accumulation and titratable acidity of grape berries. Australian Journal of Grape and Wine Research, 21(2), 266-276. https://doi.org/10.1111/ajgw.12132
  36. Pastore, C., Zenoni, S., Fasoli, M., Pezzotti, M., Tornielli, G. B., & Filippetti, I. (2013). Selective defoliation affects plant growth, fruit transcriptional ripening program and flavonoid metabolism in grapevine. BMC Plant Biology, 13(1), 1-16. https://doi.org/10.1186/1471-2229-13-30
  37. Poni, S., Bernizzoni, F., Civardi, S., & Libelli, N. (2009). Effects of pre‐bloom leaf removal on growth of berry tissues and must composition in two red Vitis vinifera L. cultivars. Australian Journal of Grape and Wine Research, 15(2), 185-193. https://doi.org/10.1111/j.1755-0238.2008.00044.x
  38. Poni, S., Casalini, L., Bernizzoni, F., Civardi, S., & Intrieri, C. (2006). Effects of early defoliation on shoot photosynthesis, yield components, and grape composition. American Journal of Enology and Viticulture, 57(4), 397–407. https://doi.org/10.5344/ajev.2006.57.4.397
  39. Poni, S., Chiari, G., Caffi, T., Bove, F., Tombesi, S., Moncalvo, A., & Gatti, M. (2017). Canopy physiology, vine performance and host-pathogen interaction in a fungi resistant cv. Sangiovese x Bianca accession vs. a susceptible clone. Scientific Reports, 7(1), 6092. https://doi.org/10.1038/s41598-017-05530-7
  40. Quartacci, M. F., Sgherri, C., & Pinzino, C. (2022). Impact of leaf removal on phenolics and antioxidant activity of Trebbiano berries (Vitis vinifera L.). Plants, 11(10), 1303. https://doi.org/10.3390/plants11101303
  41. Rende, M., Köse, C., & Kaya, O. (2018). An assessment of the relation between cold-hardiness and biochemical contents of winter buds of grapevine cv. ‘Karaerik’ in acclimation–hardening–deacclimation phases. Mitteilungen Klosterneuburg Rebe und Wein Obstbau und Früchteverwertung, 68(2), 67–81.
  42. Ristic, R., Downey, M. O., Iland, P. G., Bindon, K., Francis, I. L., Herderich, M., & Robinson, S. P. (2007). Exclusion of sunlight from Shiraz grapes alters wine colour, tannin and sensory properties. Australian Journal of Grape and Wine Research, 13(2), 53-65. https://doi.org/10.1111/j.1755-0238.2007.tb00235.x
  43. Sabır, A., Tangolar, S., Buyukalaca, S., & Kafkas, S. (2009). Ampelographic and molecular diversity among grapevine (Vitis spp.) cultivars. Czech Journal of Genetics and Plant Breeding, 45(4), 160-168.
  44. Singleton, V. L., & Rossi, J. A. (1965). Colorimetry of total phenolics with phosphomolybdic-phosphotungstic acid reagents. American Journal of Enology and Viticulture, 16(3), 144–158. https://doi.org/10.5344/ajev.1965.16.3.144
  45. Sivilotti, P., Herrera, J. C., Lisjak, K., Baša Česnik, H., Sabbatini, P., Peterlunger, E., & Castellarin, S. D. (2016). Impact of leaf removal, applied before and after flowering, on anthocyanin, tannin, and methoxypyrazine concentrations in ‘Merlot’(Vitis vinifera L.) grapes and wines. Journal of Agricultural and Food Chemistry, 64(22), 4487-4496.
  46. Smart, R. E., Dick, J. K., Gravett, I. M., & Fisher, B. M. (1990). Canopy management to improve grape yield and wine quality-principles and practices. South African Journal of Enology and Viticulture, 11(1), 3-17.
  47. Smith, M. S., & Centinari, M. (2019). Impacts of early leaf removal and cluster thinning on Grüner Veltliner production, fruit composition, and vine health. American Journal of Enology and Viticulture, 70(3), 308–317. https://doi.org/10.5344/ajev.2019.18100
  48. Staff, S. L., Percival, D. C., Sullivan, J. A., & Fisher, K. H. (1997). Fruit zone leaf removal influences vegetative, yield, disease, fruit composition, and wine sensory attributes of Vitis vinifera L.'Optima'and'Cabernet franc'. Canadian Journal of Plant Science, 77(1), 149-153. https://doi.org/10.4141/P95-184
  49. Tahmaz, H., Küskü, D. Y., Söylemezoğlu, G., & Çelik, H. (2022). Phenolic compound and antioxidant capacity contents of Vitis labrusca L. genotypes. Journal of Tekirdag Agricultural Faculty, 19(2). https://doi.org/10.33462/jotaf.952108
  50. Tardáguila, J., De Toda, F. M., Poni, S., & Diago, M. P. (2010). Impact of early leaf removal on yield and fruit and wine composition of Vitis vinifera L. Graciano and Carignan. American Journal of Enology and Viticulture, 61(3), 372-381. https://doi.org/10.5344/ajev.2010.61.3.372
  51. Tardáguila, J., Diago, M. P., Martínez de Toda, F., Poni, S., & Vilanova de la Torre, M. D. M. (2008). Effects of timing of leaf removal on yield, berry maturity, wine composition and sensory properties of cv. Grenache grown under non irrigated conditions. J. Int. Sci. Vigne Vin, 42(4), 221-229.
  52. Türk, F., & Köse, B. (2024). Effects of green pruning and combine microelement applications on bud fruitfulness, vegetative development and cluster characteristics of ‘Trakya İlkeren’grape cultivar. International Journal of Agriculture Environment and Food Sciences, 8(1), 94-110. https://doi.org/10.31015/jaefs.2024.1.11
  53. Uyak, C. (2010). A study on the determination of the ampelographic characteristics of grape cultivars grown in the Siirt Region. (Ph.D. Dissertation), Van Yüzüncü Yıl University, Van, Türkiye.
  54. VanderWeide, J., Gottschalk, C., Schultze, S. R., Nasrollahiazar, E., Poni, S., & Sabbatini, P. (2021). Impacts of pre-bloom leaf removal on wine grape production and quality parameters: A systematic review and meta-analysis. Frontiers in Plant Science, 11, 621585. https://doi.org/10.3389/fpls.2020.621585
  55. Wegher, M., Niedrist, G., Tagliavini, M., Abella, M. D. A., Giuliani, N., & Andreotti, C. (2025). Impact of leaf removal on recovery of young grapevines under heatwave conditions: A study in an ecotron environment. Oeno One, 59(3), 1-14. https://doi.org/10.20870/oeno-one.2025.59.3.7462
  56. Würz, D. A., Rufato, L., Bogo, A., Allebrandt, R., de Bem, B. P., Marcon Filho, J. L., & Bonin, B. F. (2020). Effects of leaf removal on grape cluster architecture and control of Botrytis bunch rot in Sauvignon Blanc grapevines in Southern Brazil. Crop Protection, 131, 105079. https://doi.org/10.1016/j.cropro.2020.105079
  57. Yemm, E. W., & Willis, A. (1954). The estimation of carbohydrates in plant extracts by anthrone. Biochemical Journal, 57(3), 508.
  58. Zabadal, T. J., Dami, I. E., Goffinet, M. C., Martinson, T. E., & Chien, M. L. (2007). Winter injury to grapevines and methods of protection (Extension Bulletin E-2930). Michigan State University Extension.
  59. Zenoni, S., Dal Santo, S., Tornielli, G. B., D’Incà, E., Filippetti, I., Pastore, C., & Poni, S. (2017). Transcriptional responses to pre-flowering leaf defoliation in grapevine berry from different growing sites, years, and genotypes. Frontiers in Plant Science, 8, 630. https://doi.org/10.3389/fpls.2017.00630
  60. Zhishen, J., Mengcheng, T., & Jianming, W. (1999). The determination of flavonoid contents in mulberry and their scavenging effects on superoxide radicals. Food Chemistry, 64, 555–559. https://doi.org/10.1016/S0308-8146(98)00102-2