EPIGEAL AND HYPOGEAL GERMINATION PDF
Difference between Epigeal and Hypogeal Seed Germination. The term germination designates the overall processes beginning with the imbibition of water by. The main difference between epigeal and hypogeal germination is that in epigeal germination, the cotyledons emerge out of the soil during. Hope you already know that what is cotyledon and how seeds germinate. Epigeal; In this type of germination, the seed /cotyledons emerge out of the soil or .
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After this hypocotyl grows due to which two papery cotyledons enclosed by endosperm are pulled out of the soil. This develops the aerial shoot even before the roots have come in contact with the soil.
Types of Seed Germination – Epigeal vs Hypogeal | Plant Science 4 U
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Details of wheat grain germination Fig. The ecology of tropical forest tree seedlingspp. The plumule pierces the fibrous pericarp and emerges like a horn.
During germination the lower end of the embryo forms the cotyledon which begins to grow as a spongy structure inside the endosperm. Adventitious roots are formed from the lowermost nodes above the mesocotyl Fig. Normally, the cotyledon is fleshy, and contains many nutrients that are used for germination.
Epigeal and Hypogeal Germination
hypoogeal Because the cotyledon stays below the ground, it is much less vulnerable to for example night-frost  or grazing. Views Read Edit View history. This means the hypocotyl shows a greater elongation in epigeal germination while the hypocotyl is short in hypogeal germination.
Meanwhile adventitious roots develop from above the radicle and form a fibrous root system Fig. In this way, the hypocotyl pushes the cotyledon upward. Plants that show epigeal germination grow relatively fast, especially in the first phase hermination the leaflets unfold. Epigeal is also not the same as hypogeal germination; both epigeal and hypogeal plants will grow differently.
The seed coat is cast off and the cotyledons open out like two leaves, become green, large and thin so that they look and behave epigeak ordinary leaves. Plants that show hypogeal germination grow relatively slowly, especially hypkgeal the first phase.
The epicotyl part of the stem above the cotyledon grows, while the hypocotyl part of the stem below the cotyledon stays the same length. In epigeal germination, the energy comes from the cotyledons, while, in hypogeal germination, the energy comes from the endosperm.
Here’s how it works: In mangrove plants e. Vivipary is the phenomenon of giving birth to young ones in advanced stage of development. Hypogeap hypocotyl part of the stem below the cotyledon elongates while the epicotyl part of the stem above the cotyledon stays the same length.
Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top. The opposite of epigeal is hypogeal underground germination.
The opposite germunation hypogeal is epigeal above-ground germination. In this kind of germination, the cotyledons do not come out of the soil surface.
Seed Germination Types (With Diagram)
In seeds with epigeal germination, the cotyledons are brought above the soil due to elongation of the hypocotyl. An example of a plant with hypogeal germination is the pea Pisum sativum. Epigeal germination occurs in beans and castor while the hypogeal germination occurs in coconut, pea, and maize.
The second leaves derived from the plumule become true leaves. The germinatipn becomes heavy.
Difference Between Epigeal and Hypogeal Germination –
After emerging out annd the soil, these cotyledons are called seed leaves, which become photosynthetic as well. It is possible that within the same genus one species shows epigeal germination while another species shows hypogeal germination.
On the other hand, they are more resistant when a flooding takes place. Because the cotyledon is positioned above the ground it is much more vulnerable to damage like night-frost  or grazing.
Plants that show epigeal germination need external nutrients rather quickly in order to develop, so they are more frequent on nutrient-rich soils. The relative position of the cotyledons is determined by the length of the hypocotyl.