The mouse ears burst: the adapter makes the leaves first


It will soon explode as thousands of light green mouse ears burst at once.

In order for the leaves to grow, the sugars and nutrients stored in the fall hurt at a rapid rate. If a hole were now drilled in the body, juice would flow out of it, a building block used for rapid cell expansion.

Birch is the tree best adapted to Finnish conditions and therefore the first in the magazine.

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“Birch does so well because its body is white. The sunny spring days do not melt its surface too early, but the tree can sleep peacefully well into spring without wasting energy, ”says Professor of Plant Biology Kurt Fagerstedt notes.

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A well-rested birch is always ready to wake up first. The tree makes the miniature leaves ready for the buds already in the fall. Therefore, the success of birches can be measured by the previous summer. After a dry summer, the tree will be more exposed than usual the following spring.

In spring, the goal of the tree is to grow its leaves quickly to large. Since February, the bud has accurately measured temperature and day length through its protective sheath.

Usually, the first magazines dare to emerge only in May. If the frost destroys them, the birch will not have time to start contacting just before flowering. It is left without nutrition when the need for nutritious sugars would be greatest.

This rarely happens. Usually, night frosts are not so severe that mouse ears freeze.

The outbreak of mouse ears is an important sign of the spring’s progress, with hunting, fishing and sowing schedules planned in advance.


Source: Tiede by www.tiede.fi.

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