Light germs
As Lichtkeimer refers to plants whose seeds for germination - in addition to the usual conditions for germination of water, heat and oxygen - even light need. This process is controlled by photoreceptors of the phytochrome system .
When creating the seedbed and sowing it must be ensured that the layer of soil covering the seeds ( seeds ) is at most as thick as they are. The seeds can easily be washed away by rain or irrigation water. On a small scale, the planter can be covered with a transparent film to prevent the surface from drying out.
Typical light germs are:
- Purple loosestrife ( Lythrum salicaria )
- Dill (plant) ( Anethum graveolens )
- Garden cress ( Lepidium sativum )
- Carrot ( Daucus carota subsp. Sativus )
- Lettuce ( Lactuca sativa )
- Rye ( Secale cereale )
- Mustard ( Sinapis alba L. )
- Celery ( Apium graveolens )
- Tomato ( Solanum lycopersicum )
- Red foxglove ( Digitalis purpurea )
- Virginian tobacco ( Nicotiana tabacum )
The horticultural seeds are usually relatively small and do not provide the seedling with enough energy to penetrate a thick layer of soil. In the nursery, seeds from light germs are mostly exposed to radiation with red to infrared light. Without this measure, the germination capacity is greatly reduced.
By stratifying or treating the seeds with substances such as gibberellic acid , the dormancy of the plant seeds can be shortened.
See also
Individual evidence
- ^ A b c Peter Sitte , Hubert Ziegler , Friedrich Ehrendorfer , Andreas Bresinsky : Textbook of botany for universities. Founded by Eduard Strasburger , Fritz Noll, Heinrich Schenck, AF Wilhelm Schimper. 33rd edition. Gustav Fischer, Stuttgart / Jena / New York 1991, ISBN 3-437-20447-5 , p. 404.
- ↑ The small garden: table with light and dark germinating plant species
- ^ Peter Sitte , Hubert Ziegler , Friedrich Ehrendorfer , Andreas Bresinsky : Textbook of botany for universities. Founded by Eduard Strasburger , Fritz Noll, Heinrich Schenck, AF Wilhelm Schimper. 33rd edition. Gustav Fischer, Stuttgart / Jena / New York 1991, ISBN 3-437-20447-5 , p. 390.