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Abstrakty
The changes in the antioxidant enzymes activity, total protein and proline content and their correlations with freezing tolerance (FT) (expressed as LT₅₀) were investigated at 11 different olive cultivars at cold-acclimation (CA, in February) and non-acclimation (NA, in August) stages. Leaf samples were collected from each cultivar and were divided into two groups. The first group was immediately frozen in liquid nitrogen for further biochemical analysis. The second ones was subjected to different freezing temperatures (-5, -10, -15 and -20°C) for 10 h, in order to determine their FT. The unfrozen control samples were kept at 4°C. The results showed that Fishomi, Mission and Shengeh were the most freezing tolerant among other cultivars. In contrast, Zard, Manzanilla and Amigdalolia were the most sensitive ones. The cold acclimation enhanced the activities of superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX), catalase (CAT), polyphenol oxidase (PPO) and total protein content. However, proline content and phenylalanine ammonia-lyase (PAL) activity did not change or even decreased slightly at CA stage, compare to those samples at NA stage. It was found that LT₅₀ to be closely correlated to POD, CAT, and PPO activity at CA and NA stages. Overall, higher leaf POD, CAT, and PPO activity could be used as important selection criteria in screening tolerant olive cultivars for cold zone climatic.
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Opis fizyczny
p.3231-3241,fig.,ref.
Twórcy
autor
- Department of Horticultural Sciences, Faculty of Agriculture Sciences, University of Guilan, Rasht, Iran
autor
- Department of Horticultural Sciences, Faculty of Agriculture Sciences, University of Guilan, Rasht, Iran
autor
- Department of Horticultural Sciences, Faculty of Agriculture Sciences, University of Guilan, Rasht, Iran
autor
- Department of Biotechnology, Faculty of Agriculture Sciences, University of Guilan, Rasht, Iran
Bibliografia
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Typ dokumentu
Bibliografia
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