from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The part of the axis of a plant embryo or seedling plant that is below the cotyledons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In plants with seeds, that portion of the embryo or seedling between the root and cotyledons.
from The Century Dictionary and Cyclopedia
- n. In botany, that part of the axis which is below the cotyledons. Also called the caulicle, and erroneously the radicle.
Arabidopsis thaliana, the embryonic stem or hypocotyl grows rapidly by longitudinal cell expansion in a process referred to as hypocotyl elongation.
Â Itâ€ ™ s also grown for its fleshy hypocotyl which is used as medicinal herbal.
For some reason, I still maintain the awestruck wonder of a kinder planting beans pressed against the side of a jar so that the roots, hypocotyl, and plumule display, then watch in amazement as they burst through the ground and struggle toward the light.
Roots - the swollen root-hypocotyl is rich in starch and sugars and can be creamy-yellow or light or dark purple in colour; yellow ones are usually the most popular.
Below the ground the central axis is a fleshy structure consisting of the swollen tap root and hypocotyl, similar in general shape to a globe salad radish, but ending in a thick strong root with numerous lateral rootless.
Isolation and identification of a new growth inhibitor, Raphanusanin, from radish seedlings and its role in light inhibition of hypocotyl growth.
The hypocotyl region of affected plants is usually constricted, with black necrotic lesions at soil level.
Bean with one cotyledon removed, after sprouting had begun. _a_, Seed-coat; _b_, cotyledon; _c_, epicotyl; _d_, hypocotyl; _e_, endosperm.
This is the epicotyl, and another growing tip pointed toward the lower end of the kernel; this is the hypocotyl or the part which penetrates the soil and forms roots.
After sending down a root the hypocotyl began to develop into a strong stem which crooked itself until it reached the surface of the soil and then pulled the cotyledons or seed-leaves after it (Fig. 42).
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