The pollen grains of the Scotch Pine is transported by the atmospere and they are wind-transported. Pollen emission begins at given site as a function of accumulation of heat units above growth threshold temperatures after winter.
After pollination begins the seed germination. After pollination it takes near two yers when the seeds are mature to product a new plant.
At the beginning of may was the new stem short and brown. It grew longer and the needles became green when thermal sum grow.
When the stem grow came the other organs visible. In the middle of May we can see small little yellow balls in stem. They were male blooms, male strobili.
In the male strobili were the pollen maturing.
The task of mature pollen grains is to flow in the female strobili and fertilize the egg cells in it. The brown little cones in the end of stem are female strobili, female blossoms.
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Toimittaja(t): teacher
Muokattu: 15.3.2003 15:17
