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normal light conditions, hypocotyl growth is controlled by a process called photomorphogenesis, while shading the seedlings evokes a rapid transcriptional response which negatively regulates photomorphogenesis and results in increased rates of hypocotyl growth. This rate is highest when plants are kept in darkness mediated by a process called skotomorphogenesis, which contrasts photomorphogenesis.
213:—that part of the young plant that lies between the seed (which remains buried) and the plumule—extends the shoot up to the soil surface, where secondary roots develop from just beneath the plumule. The primary root from the radicle may then fail to develop further. The mesocotyl is considered to be partly hypocotyl and partly cotyledon (see
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One of the widely used assays in the field of photobiology is the investigation of the effect of changes in light quantity and quality on hypocotyl elongation. It is frequently used to study the growth promoting vs. growth repressing effects of application of plant hormones like ethylene. Under
230:(stored food reserve) pulled upwards as the cotyledon extends. Later, the first true leaf grows from the node between the radicle and the sheath-like cotyledon, breaking through the cotyledon to grow past it.
173:. After emergence of the radicle, the hypocotyl emerges and lifts the growing tip (usually including the seed coat) above the ground, bearing the embryonic leaves (called
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In some plants, the hypocotyl becomes enlarged as a
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222:Not all monocots develop like the grasses. The
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129:) seed, indicating position of hypocotyl.
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347:, "Plant Physiology",21-06-2016
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266:Hypocotyl elongation assay
318:Oxford English Dictionary
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242:. Examples include
374:Plant reproduction
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312:"hypocotyl"
291:Dicotyledon
58:"Hypocotyl"
358:Categories
333:required.)
297:References
203:coleoptile
197:and other
175:cotyledons
143:cotyledons
69:newspapers
16:Plant part
228:endosperm
211:mesocotyl
207:cotyledon
135:hypocotyl
281:Epicotyl
275:See also
256:cyclamen
252:celeriac
248:gloxinia
244:cyclamen
185:Monocots
157:Eudicots
139:seedling
199:grasses
195:cereals
191:monocot
167:radicle
147:radicle
83:scholar
163:embryo
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260:tuber
254:. In
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216:seed
179:stem
171:soil
151:root
133:The
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