Studies of the impact of environmental conditions and varietal features of sweet cherry on the accumulation of vitamin C in fruits by using the regression analysis method

Abstract

EN: Studies of the impact of environmental conditions and varietal features of sweet cherry on the accumulation of vitamin C in fruits by using the regression analysis method Abstract: The accumulation of vitamin C in sweet cherry fruits depends on the variety and environmental conditions. The aim of our research was to substantiate the rate of impact of weather factors as well as of varietal features on vitamin C accumulation in sweet cherry fruits. The varieties ʹKazkaʹ and ʹZabutaʹ, ʹKordiaʹ and ʹMirazhʹ were chosen as the best ones from among 33 varieties of early, medium and late term of ripening (7.31–10.67 mg 100 g-1) according to the average content of vitamin C in sweet cherry fruits. The studies found that the environmental conditions of the research years had the largest impact on the vitamin C content in the fruits of late and early ripening varieties, and in the fruits of medium ripening variety the vitamin C amount depended on the varietal features. The practicability of forecasting of vitamin C content in sweet cherry fruits on the average indices for a group of early and late maturity varieties, but not separately for every pomological variety, has been proven. For the medium ripening variety this index can be forecasted within each pomological variety. The models of dependence of vitamins C accumulation on the impact of meteorological parameters were evaluated on the basis of the principle components analysis and the least square method. SI: Preučevanje vpliva vremenskih dejavnikov in lastnosti sort na vsebnost vitamin C v plodovih češenj z metodo regresijske analize Izvleček: Količina vitamin C v plodovih češenj je odvisna od sorte in okoljskih razmer. Namen te raziskave je bil ovrednotiti vpliv vremenskih dejavnikov in lastnosti sort na količino vitamina C v plodovih češenj. Izmed 33 zgodnjih, srednjih in poznih sort so bile izbrane najboljše sorte kot so ʹKazkaʹ,ʹZabutaʹ, ʹKordiaʹ in ʹMirazhʹ glede na poprečno vsebnost vitamin C (7,31–10,67 mg 100 g-1) v plodovih. Raziskava je odkrila, da so imele na vsebnost vitamina C v plodovih zgodnjih in poznih sort češenj največji vpliv vremenske razmere posamezne rastne sezone, pri srednje dozorevajočih sortah pa so imele največji vpliv na vsebnost vitamina lastnosti sort. Dokazana je bila možnost napovedovanja vsebnosti vitamina C v plodovih zgodnjih in poznih sort na osnovi povprečnih indeksov, vendar ne za vsako sorto posebej. Za srednje dozorevajoče sorte bi lahko uporabili ta indeks za vsako sorto posebej. Model za ugotavljanje odvisnosti kopičenja vitamina C v odvisnosti od vremenskih dejavnikov je bil ovrednoten na osnovi analize glavnih komponent in metode najmanjšega kvadrata.