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Start Over Coverage 448-458

2. Responses in the physiology and biochemistry of Korean pine (Pinus koraiensis) under supplementary UV-B radiation

Creator:
Zu, Y. G., Wei, X. X., Yu, J. H., Li, D. W., Pang, H. H., and Tong, L.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
botanika, botany, epicuticular wax, Korean pine, photosynthesis, and UV-B radiation
Language:
Multiple languages
Description:
The effect of supplementary UV-B radiation on Korean pine (Pinus koraiensis Sieb. et Zucc) was investigated. Compared with the control, the T1, T2, and T3 UV-B treatments increased by 1.40, 2.81, and 4.22 kJ m-2 d-1, respectively. Gas-exchange parameters, photosynthetic pigment concentrations, contents of secondary metabolites, epicuticular wax, free radical, malondialdehyde (MDA), and the activities of antioxidant enzymes were determined after 40 d of exposure. The concentrations of chlorophyll (Chl) a, Chl b, total Chl, carotenoid (Car), and the ratio Chl a/b in the pine needles were in the following order: T1 > T2 > T3. Compared with the control, the contents of flavonoids and epicuticular wax significantly decreased in all levels of supplementary UV-B radiations (p<0.05). Moreover, the contents of hydrogen peroxide (H2O2) and MDA significantly increased with the enhanced UV-B radiations (p<0.05). Korean pine can increase the catalase, ascorbate peroxidase, and superoxide dismutase activities to prevent oxidative stress by supplementary UV-B radiation. However, its defence mechanism is not efficient enough to prevent UV-B-induced damage. and Y. G. Zu ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public