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| Comparative study on seasonal changes in physiological characteristics of three species of Podocarpus |
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| DOI：10.16768/j.issn.1004-874X.2018.06.008 |
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| Abstract: |
| The seasonal changes in physiological and biochemical of Podocarpus. princess，P. annamiensis and P.
macrophyllus were studied in Nanning of Guangxi. The results showed that the physiological and biochemical normal
changed with seasons changes in three species of Podocarpus. Among the permeability regulating substance change，
the content of soluble sugar was the lowest in summer and the highest in winter，the average value is P. princess>P.
annamiensis>P. macrophyllus ；soluble protein content is autumn> spring> summer> winter，the average value is P.
annamiensis>P. macrophyllus >P. annamiensis ；seasonal variation of proline content in P. princess is winter> spring
>autumn>summer and the changes between seasons were relatively gentle. Both P. annamiensis and P. macrophyllus
were autumn>spring>winter>summer and there were significant differences between seasons. In the enzyme protection
system，the dynamic changes of SOD activity in the four seasons of three types of Podocarpus were basically the
same as that of the first hight and then the downward trend，which was autumn> winter> spring> summer；the POD
activity in the four seasons was spring> summer> winter> autumn. Among them，the POD activity of P. annamiensis was highest in spring；the seasonal variation of CAT activity was winter> summer> spring> autumn；the activities of
SOD，POD，and CAT were P. annamiensis >P. macrophyllus >P. princess. In the seasonal change of photosynthetic
pigment content，the content of chlorophyll a was the lowest in summer and the seasonal variation was summer>
autumn> spring> winter；the changing rules of chlorophyll b and carotenoid content were basically the same in
summer> spring> autumn> winter，P. annamiensis> P. macrophyllus>P. princess. In summary，changes in the
seasons have different degrees of influence on the physiological and biochemical indexes of three types of Podocarpus.
Among them，the physiological and biochemical indexes of P. annamiensis are stronger than those of the other two
species Podocarpus，which shows that in the natural environment P. annamiensis growth is even more dominant. |
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