Like any animal, phanerogamic plants also emerge from an embryo in successive stages of development. The first leaf to emerge from a plant embryo in early plant development is called a cotyledon.
In this AgroCorrn article we will learn what a cotyledon is , its characteristics, its importance and its functions, as well as the types that exist or their classification.
- What is a cotyledon: definition
- Cotyledon characteristics
- Cotyledon functions and their importance
- Monocots and dicots
What is a cotyledon: definition
Within botany, the primordial leaves of flowering plants (phanerogams) that develop with the germination of the seed are called cotyledon , where they form the first leaf of the embryo. In botany, the number of cotyledons present in the seed is used as a way of classifying phanerogamic plants. The cotyledons, shoots and roots of the plant are structures that develop in the embryogenesis process prior to germination.
In addition, for the cotyledons to be able to differentiate themselves from the rest of the leaves of the plant, their size and how many nutrients they have, such as oil, starch or starch, also contribute.
Some characteristics of cotyledons are:
- They are the first leaf to emerge from the embryo of the plant.
- They can be differentiated from other leaves due to their size.
- Their number serves as a method of classifying plants.
- The cotyledon is capable of digesting the albumen (tissue that surrounds the embryo) and that after germination, it is used as food. If you want to see this process, we encourage you to do the experiment at home. Learn how to create a germinator and how to use it with this other AgroCorrn article.
- Cotyledons have various nutrients in their tissue
- Cotyledons have a short half-life because when plants develop the leaves with which they get energy, the cotyledons end up falling
- They also have different nutrients.
- It is also important to know that cotyledons are short-lived , because when the plant already manages to develop the leaves that really serve it for energy, the cotyledons fall off.
Cotyledon functions and their importance
Cotyledons are very important structures in plants, as they provide adequate nutrients and are necessary for seeds to germinate . Another function of the cotyledon is to absorb and reserve nutrients that are stored in the seed until such time as the seedling is able to generate its own true leaves that are capable of carrying out the photosynthesis process.
In addition to the aforementioned, cotyledons are also important for the coloration of plants, because thanks to them the chloroplasts appear with which the ability to carry out photosynthesis is obtained .
Monocots and dicots
Plants can be classified according to the number of cotyledons in:
Monocots include angiosperm plants that are characterized by having a single cotyledon in the seed, so that after germination they only have a single primitive leaf instead of two. These plants do not have a true secondary growth, that is, they do not have a true trunk nor do they have a cambium (plant tissue composed of embryonic cells. Monocotyledonous plants are unable to generate wood and their stature increases by widening the internodes as the plant grows.
The typical example of monocotyledonous plants are grasses (or cereals), such as wheat, corn or sugar cane, but lilies, palm trees, jonquil, tulips, onion or orchids are also monocots.
Dicotyledonous plants are the most common group and the embryo found in its seed has two cotyledons that, when germination occurs, generate two primitive leaves that will serve as food for the new seedling. The leaves of dicotyledonous plants can take various forms, there are heart-shaped, ribbon-shaped or compound and can have serrated or simple edges. The branches of these plants are composed of annual rings and made up of phloem and xylem as conductive tissues. In addition, they are capable of forming wood or firewood.
Dicotyledonous plants are the majority and up to 170,000 species are known. Rosaceae, legumes and Rutaceae belong to this group. As species, we have tobacco, beans, soybeans, peas, chickpeas, daisies, sunflowers, coffee, carob, roses, avocado or cherries.
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