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1 - Pinus cembra |
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Evergreen Pinus cembra has a hard time in late winter, when exposed to bright sun with zero photosynthetic activity due to cold temperatures. However, a suite of physiological-biochemical changes associated with winter dormancy protects plants. A visible indication of this adjustment is the yellow appearance of needles. Other species as for instance Larix decidua (larch, in the background) avoid such problems by shedding their leaves in autumn. With this strategy, they can grow in the coldest place on earth, in sub-polar western Siberia. |