epicotyl

In plant physiology, the epicotyl is the embryonic shoot above the cotyledons. In most plants the epicotyl will eventually develop into the stem and the leaves of the plant. In dicots, the hypocotyl is what appears to be the base stem under the spent withered cotyledons, and the shoot just above that is the epicotyl. The hypocotyl is what develops into the roots of the plant. In monocot plants, the first shoot that emerges from the ground or from the seed is the epicotyl, from which the first shoots and leaves emerge.

In sunflower seedlings, the difference between epicotyl and hypocotyl can be seen from the parts of the stem divided by the first pair of leaves. Here the stem above the cotyledons is covered in tiny hairs whereas the region of stem below (hypocotyl) is smooth.

Lengthening of the epicotyl is thought to be controlled by the phytochrome photoreceptors.

See also

Plant physiology is a subdiscipline of botany concerned with the function, or physiology, of plants.[1] Closely related fields include plant morphology (structure of plants), plant ecology (interactions with the environment), phytochemistry (biochemistry of plants), cell
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cotyledon (Greek: κοτυληδών) is a significant part of the embryo within the seed of a plant. Upon germination, the cotyledon becomes the embryonic first leaves of a seedling.
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Magnoliopsida
Brongniart

Orders

See text.
Dicotyledons, or "dicots", is a name for a group of flowering plants whose seed typically contains two embryonic leaves or cotyledons.
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Hypocotyl is a botanical term for a part of a germinating seedling of a seed plant. As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root and penetrates down into the soil.
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Hypocotyl is a botanical term for a part of a germinating seedling of a seed plant. As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root and penetrates down into the soil.
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Monocotyledones

orders
about 10; see text

Monocotyledons or monocots are one of two major groups of flowering plants (angiosperms) that are traditionally recognized, dicotyledons or dicots being the other.
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For other meanings of seed, see seed (disambiguation).


SEED

General
KISA
1998

Cipher detail
Key size(s):| 128 bits

Block size(s):| 128 bits
Nested Feistel network
16

SEED
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Hypocotyl is a botanical term for a part of a germinating seedling of a seed plant. As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root and penetrates down into the soil.
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