CO2 Exchange and Mesophyll Structure in Second-Year Needles of Abies sibirica Ledeb.

被引:0
|
作者
S. V. Zagirova
机构
[1] Russian Academy of Sciences,Institute of Biology, Komi Research Center, Ural Division
来源
关键词
Abies sibirica; needles; photosynthesis; dark respiration; ultrastructure;
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摘要
Seasonal changes in the net photosynthesis and dark respiration in second-year needles of Siberian fir were investigated. The functional state of needles was shown to determine the structural features of mesophyll cells. Current-year shoot growth is one of the major factors affecting the structure and functional activity of second-year needles during the growing period. The greatest changes occur in the number of mitochondria in mesophyll cells and the respiration rate of second-year needles. The rate of photosynthesis in second-year needles was shown to depend on the number of thylakoids in mesophyll chloroplasts.
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页码:41 / 43
页数:2
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