Cold hardiness of peach flowers at different phenological stages

Abstract

At the colder peach production regions it is important to know the cold hardiness of peach cultivars at different phenological stages of flowering. In our experiment, artificial freezing tests were conducted in a climate chamber in five selected years between the period of 2007 and 2016 to determine the freeze tolerance of generative organs of three peach cultivars (‘Venus’, ‘Redhaven’, ‘Piroska’) at different phenological stages of bloom. Based on the results of the laboratory freezing tests LT<sub>50</sub> values were calculated. Our results showed that LT<sub>50</sub> values of examined peach cultivars in swelled bud stage averaged over five years were between –6.8 and –11.2°C according to cultivar, and as phenological phases progressed, cold hardiness of generative organs decreased. At the end of bloom LT<sub>50</sub> values varied between –1.7 and –4.1°C. Cultivar ‘Piroska’ had the highest freeze tolerance and cultivar ‘Venus’ showed the lowest in each year studied. This study shows that trees with delayed development are more prone to cold damage to flowers.

Efficient Cold Tolerance Evaluation of Four Species of Liliaceae Plants through Cell Death Measurement and Lethal Temperature Prediction

“…This study showed the same S-shaped curve as reported in previous studies [42]. Lethal temperature predictions due to electrolyte leakage have been shown to overestimate cold tolerance by predicting relatively low lethal temperatures at low temperatures rather than actual plant regeneration [10,13,43]. However, since this study aimed to compare and predict the lethal temperature between plants, it was concluded that the cold tolerance comparison between plants was possible because the experiment was carried out under the same conditions.…”

“…The numerical expression of low-temperature tolerance levels is often required in temperature stress studies. The relationship between low-temperature stress and electrolyte leakage has the form of an S-shaped response curve, and the temperature at which 50% of electrolyte leakage begins to be observed is defined as the median lethal temperature, LT 50 [10,13,14]. Estimation of the LT 50 has been attempted primarily using linear interpolation, the logistic model, and the Gompertz model [15].…”

Frost hardiness of apple generative buds during dormancy

“…The artificial freezing experiments were performed in the climate chamber Rumed 3301 (Rubarth Apparate GmbH, Laatzen, Germany), according to the method and protocol developed on the Department of Pomology (Szalay et al, 2018(Szalay et al, , 2019. Four or five appropriate freezing temperatures were used at each testing date, according to the rate of dormancy.…”

Late spring frost effect on the reproductive traits of late nectarine cultivar-rootstock combinations (Prunus persica var. nucipersica)

“…A number of authors have studied the relationship between spring frost and peach and nectarine phenological phase [4,12]. Other researchers [11] have determined that phenological and pomological characteristics are important for introduced nectarine cultivars adaptation.…”