Utjecaj kasne rezidbe u zrelo na fenologiju, prirod i kemijski sastav grožđa sorte 'Portugizac' (Vitis vinifera L.)

master's thesis

• Title (english): Effect of delayed winter pruning of Portugieser grapevines on grape primary and phenolic composition
• Author: Lovre Ljubičić
• Mentor: Marko Karoglan (mentor)
• Committee member: Marko Karoglan (predsjednik povjerenstva)
• Committee member: Ana Jeromel (član povjerenstva)
• Committee member: Ana-Marija Jagatić Korenika (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Viticulture and Enology); Zagreb
• Defense date and country: 2022-07-07, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Utjecaj klimatskih promjena ima veliki utjecaj na odvijanje fenofaza vinove loze, a time
i na samu kvalitetu i prinos grožđa. U posljednje vrijeme istražuju se načini koji će u praksi,
unatoč klimatskim promjenama, pomoći grožđu da postigne zadovoljavajući rezultat. Jedan od
takvih zahvata je i rezidba u zrelo koja se obavlja kasnije od uobičajenih termina. Cilj ovog
rada bio je prikazati učinak kasne rezidbe na razvojni ciklus vinove loze, prinos i kemijski
sastav grožđa sorte ˈPortugizacˈ, koji je zbog vrlo rane dobi dozrijevanja izabran kao pokusna
sorta. Istraživanje je provedeno 2021. godine po slučajnom bloknom rasporedu sa tri tretmana
rezidbe: uobičajena zimska rezidba (kontrola), rezidba u trenutku otvaranja pupa te rezidba u
trenutku pojave 2-3 odvojena lista.
Kroz provedeno istraživanje o utjecaju kasne rezidbe na kemijski sastav grožđa sorte
ˈPortugizacˈ pokazano je da je kasna rezidba koja je bila provedena u vrijeme pupanja
rezultirala smanjenjem sadržaja šećera, ali i ukupnih kiselina u grožđu, te povećanjem ukupnih
polifenola, antocijana, flavonola, stilbena te fenolnih kiselina u kožici grožđa u odnosu na
kontrolnu (zimsku) rezidbu provedenu tijekom mirovanja vinove loze. Kasna rezidba
provedena u terminu otvaranja 2-3 lista loze rezultirala je smanjenjem sadržaja šećera, ali i
ukupnih polifenola i antocijana, te povećanjem koncentracije ukupne kiselosti, ukupnih
flavanola, stilbena i fenolnih kiselina.

Abstract (english)

The effect of climate change has a great influence on the development of the
phenophases of the grapevine, and consequently on the quality and yield of the grapes.
Recently, new methods have been researched that could help grapes to achieve a satisfactory
result, despite climate changes. One of such interventions is late pruning, which is performed
later than usual. The aim of this work was to demonstrate the effect of late pruning on the
development cycle of the grapevine, yield and chemical composition of grapevien variety
ˈPortugizacˈ, which was chosen as an experimental variety due to its early ripening. The
research was conducted in 2021 according to a random block arrangement with three pruning
treatments: standard winter pruning (control), pruning at the moment of budbreak and pruning
at the moment of appearance of 2-3 separate leaves. ˈ
Through the conducted research on the influence of late pruning on the chemical
composition of grapes ˈPortugizacˈ, it was concluded that late pruning, which was performed
at the time of budburst, resulted in a decrease in the content of sugar, but also in total acids, and
in an increase in total polyphenols, anthocyanins, flavonols, stilbenes and phenolic acids in the
grape skin compared to the standard winter pruning. Late pruning performed at the time of
opening of 2-3 leaves resulted in a decrease in sugar content, but also in total polyphenols and
anthocyanins, and in an increase in the concentration of total acidity, total flavanols, stilbene
and phenolic acids.

• Keywords: kasna rezidba; ˈPortugizacˈ; fenologija; kemijski sastav; polifenoli
• Keywords (english): late pruning; ˈPortugizacˈ; phenology; chemical composition; polyphenols
• Language: croatian
• URN:NBN: urn:nbn:hr:204:975410
• Study programme: Title: Horticulture; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka hortikulture (magistar/ magistra inženjer/inženjerka hortikulture)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2022-08-18 10:51:20