期刊
TREES-STRUCTURE AND FUNCTION
卷 25, 期 6, 页码 1043-1052出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00468-011-0579-1
关键词
Antioxidants; Photosynthetic pigments; Gas exchange; Quercus cerris L.; Q. frainetto Ten.
类别
资金
- National Science Fund (Bulgaria)-Project-MU-SS [1401/2004]
- OAD
Seasonal changes in physiological and biochemical parameters were studied in 35-, 55- and 140-year-old trees of Turkey oak (Quercus cerris L.) and Hungarian oak (Q. frainetto Ten.), growing in natural stands in Eastern Balkan Mountains (Bulgaria). During the seasonal drought period (August), assimilation activity, transpiration rate, stomatal conductance and water potential had a seasonal minimum in all the studied tree ages and species. The foliar concentrations of glutathione, ascorbate, alpha-tocopherol, as well as photosynthetic pigments in oak leaves were significantly affected by season. With the increasing age of the studied trees, we observed a decrease of the physiological activity and an increase of the antioxidants' accumulation. Both the species were drought tolerant and anisohydric, where Q. frainetto exhibited higher rates of gas exchange than Q. cerris. Moreover, they differed in the extent of increase in the foliar antioxidants and carotenoids.
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