Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The part of a plant embryo or seedling plant that is between the cotyledons and the radicle or root.
from The Century Dictionary.
- noun In botany, that part of the axis which is below the cotyledons. Also called the caulicle, and erroneously the radicle.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun botany In
plants withseeds , that portion of theembryo orseedling between theroot andcotyledons .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Arabidopsis thaliana, the embryonic stem or hypocotyl grows rapidly by longitudinal cell expansion in a process referred to as hypocotyl elongation.
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 It†™ s also grown for its fleshy hypocotyl which is used as medicinal herbal.
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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.
"Hey, Matt. Sure is a gorgeous day to get drunk and throw beanbags back and forth on the front sidewalk for 11 hours!" Ann Althouse 2009
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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.
Chapter 23 1987
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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.
Chapter 23 1987
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Isolation and identification of a new growth inhibitor, Raphanusanin, from radish seedlings and its role in light inhibition of hypocotyl growth.
Chapter 27 1987
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The hypocotyl region of affected plants is usually constricted, with black necrotic lesions at soil level.
Chapter 7 1981
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Bean with one cotyledon removed, after sprouting had begun. _a_, Seed-coat; _b_, cotyledon; _c_, epicotyl; _d_, hypocotyl; _e_, endosperm.
The First Book of Farming Charles Landon Goodrich
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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.
The First Book of Farming Charles Landon Goodrich
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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).
The First Book of Farming Charles Landon Goodrich
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