The hidden face of plants
Life is full of changes and surprises, and among the changes we are all witnessing, but without being aware of it, is the change of nature according to the seasons!
Starting with a seed and ending with flowers! A fascinating story to discover! By the way, today I chose to talk to you about the life of plants and flowers! From birth to old age! And yes, all as humans and animals, flowers and plants also age! This is what you will discover through this article!
So on the program: The stages of plant growth!
Are you ready to make discoveries?
Perfect then let's go!
1- Small introduction to discover the world of plants:
Apart from vegetative propagation, the life stages of a flowering plant are:
- The development of the vegetative apparatus, which means: Roots, stems and leaves!
- The growth
Like animals, plants are prone to aging and death!
Depending on their lifespan, annual plants, which have the life cycle of one year, are distinguished from biennial plants: Those with the two-year life cycle, as well as perennials, which means plants that have a life cycle spread over more than two years
2- The Universe of Plants: Annual, Biennial and Perennial Plants:
- Annual plants:
In annual plants, the life cycle that is: From the seed that gave birth to the plant until the production of new seeds, is spread over a single year.
Once the seeds are dispersed, the plant dies, and in this case, the seeds help protect against the passage in the bad season!
During the winter, the seeds adopt a slow way of life and germinate only when favorable conditions come back, especially a sufficient temperature!
However, some seeds, such as those of apple (apple seeds), must necessarily undergo the cold of winter to acquire the ability to germinate when the return of favorable conditions!
Do you know ?
However, it is possible to treat them by the cold to artificially obtain their germination! In addition, in some plants, such as certain varieties of wheat, flowering is possible only if the seed has been exposed to cold!
- The biennial plants:
For the biennial plant, there is no flowering the first year and the plant accumulates reserves in a specialized organ, such as a bulb or a tuber!
During the winter, this organ adopts a slower way of life, and resumes its activity only at the return of favorable conditions! The buds that these organs contain, then develop using the accumulated reserves the previous year until the vegetative system is sufficiently developed for photosynthesis to make it autonomous!
It is then that the reproductive system develops, which means: The flowers, and that the sexual reproduction can occur, leading to the formation of seeds that will spend the winter in slowed mode of life like those of the plants annuals, and, as with the latter! Finally, once the seeds are dispersed, the plant dies!
In perennials, seeds are produced every year and the plant overwinters in slowed-down life!
Herbaceous plants, that is to say, small plants, (Due to the absence of wood), spend the winter mainly in the form of underground and perennial reserve organs, which means: tuberous root, rhizome, bulb, and tuber, sometimes with some leaves!
Trees as well as flowering plants that can reach very large dimensions, because of the support provided by the wood, also spend the winter in slowed down life!
In addition, the development of buds in the spring is ensured by the reserves contained in their vessels drivers!
Germination is only possible for a mature seed, that is to say which has finished the accumulation of reserves and has reached a state of dehydration pushed! In addition, some seeds can not germinate if they have not been exposed, cold!
This phenomenon is called dormancy and is reflected in the fact that even if favorable conditions of temperature and humidity are met, the dormant seed that has not suffered the winter cold, will not germinate!
This characteristic, limited to a few species, prevents the seed from germinating prematurely!
Because of their high dehydration, the seeds can remain in slowed-down mode, as long as the conditions for germination are not met! Some seeds can thus remain several years in slowed life! The germination of the seed depends on external and internal factors, and is manifested in particular by morphological changes, visible to the naked eye, and by changes at the cellular level, which can only be observed under the microscope!
During germination, several stages follow one another.
The first condition of germination is:
- The hydration of the seed that allows the passage of cells from slowed down to active life,
- Biochemical reactions can not occur in the absence of water!
Because by imbibing water, the seed is rehydrated, which is manifested externally by its swelling and softening.
On the other hand, the swelling of the seed is not a biological phenomenon and is manifested in the same way in seeds killed in advance and in living seeds, and results in the bursting of the seed coat which envelops the seed!
Unlike most animals, plants grow indefinitely, that is, they continue to grow throughout their life!
In our climate, the growth of perennials, (those that live several years as trees), is discontinuous!
The emergence of new leafy twigs is ensured each year by the blooming buds that were formed during the favorable season and spent the winter in a slower way of life!
As you probably know, flowering corresponds to the development of flower buds, particular buds that give birth to flowers!
And now, you have just discovered the world of plants and their lives!
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