Document Type : Original Article

Authors

1 Faculty of Plant Production, Gorgan University of Agriculture and Natural Resources, Gorgan, Iran

2 Associate Professor, of Horticulture, Faculty of Plant Production, Gorgan University of Agriculture and Natural Resources, Gorgan, Iran

3 Professor of Horticulture, Faculty of Agriculture, University of Guilan, Guilan, Iran

Abstract

Introduction: Citrus is among the low temperature (freezing) - susceptible plants. The performance of storage and breeding of horticultural crops is mainly dependent on the correlation among the traits.

Materials: To determine the relationship between stress tolerance (LT50) and some important physiological traits and finding their direct and indirect effects, four commercial citrus cultivars of Japanese mandarin, Thomson orange, Ruby Star grapefruit and Lisbon lemon in three temperature levels (4, -4 and -8 °C) were studied at the Horticulture laboratory of Guilan University in 2021. Before treating and for adaptation of plant material to temperature decrease, the plants were moved to a temperate greenhouse and then to a +4 °C cool storage with 65±5 percent relative humidity.

Results: Illustrates the changes in LT50 as affected by changes in citrus lipid peroxidation, ion leakage and total flavonoid at +4 °C and –4 °C. According to the regression coefficient, a change of one unit in lipid peroxidation led to a 1.9238 and 5.9615 unit decrease in LT50 at +4 and –4 °C, for ion leakage led to 0.1661 and 0.3587 unit changes in LT50 at +4 and –4 °C and for total flavonoid led to a 0.0471 and 0.236 unit decrease in LT50 at +4 and –4 °C, respectively.

Conclusion: According to the results of the present study which involved the selection of commercial citrus cultivars of Japanese mandarin, Thomson orange, Ruby Star grapefruit and Lisbon lemon in terms of stress tolerance and other traits, it may be indicated that if we look for traits with better yields at the desired temperature, those traits may include carotenoid, chlorophyll and lipid peroxidation.

Graphical Abstract

Evaluating the relationship between stress tolerance and some important physiological traits in some citrus cultivars using regression and principle component analysis

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