Seed to Seedling
When you have sown seeds the first noticeable indication of germination is the appearance of the radicle which protrudes from the seed and starts to grow down. To start with the radicle growth is caused by cell elongation, but as the radicle continues to grow the cells start to divide at the growing tip.
Once the radicle has emerged and started to grow down into the soil the shoot begins to emerge. The emerging seedling uses food reserves from the endosperm and cotyledons to grow the hypocotyl region which lengthens the seedling stem and pushes it out of the seed and towards the light. The cotyledons (single cotyledon if it is a monocotyledonous plant) then unfold and you can see your seedling. The epicotyl then starts to develop and you see the first true leaves begin to emerge and the seedling can then start feeding itself through uptake of nutrients and water from the soil through its roots and photosynthesis in its leaves.
This is when the germinating seed and developing seed is feeding from organic material i.e. using the stored food in the endosperm and cotyledons.
This is when the seedling is old enough and can feed itself from water and nutrients taken up through its roots and photosynthesis.
Funded as part of the Scottish Funding Council's curriculum development unit cost model project. Developed by the Educational Development Unit, University of the Highlands and Islands.
UHI provides links to external sources of information and may refer to specific Web sites, products, processes or services within this resource. Such references are examples and are not endorsements and whilst every effort is taken to ensure the accuracy of information provided UHI is not responsible for any of the content or guidance. You are advised to exercise caution.
Information on social media websites may also be provided. Staff using social media websites must comply with the University’s social media policy. It is recommended that you fully understand the terms and conditions of use before using these sites and that you take steps to protect personal or sensitive data.