Hypocotyl elongation in Arabidopsis is the result of regulated cell expansion that is under both environmental and hormonal controls (2). In the absence of light, seedlings undergo skotomorphogenic development. The cotyledons remain closed, an apical hook is formed, and the hypocotyl becomes greatly elongated.

What does the hypocotyl do?

The part of a plant embryo or seedling that lies between the radicle and the cotyledons. Upon germination, the hypocotyl pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem.

What is hypocotyl in embryo?

In the developing embryo, the hypocotyl is the embryonic axis that bears the seedling leaves (cotyledons). In plant development: Origin of the primary organs. … other four will form the hypocotyl, the part of the embryo between the cotyledons and the primary root (radicle).

What is a meaning of hypocotyl?

: the part of the axis of a plant embryo or seedling below the cotyledon — see seedling illustration.

What is the effect of rapid elongation of the hypocotyl during seed germination?

After a seed germinates in the soil, in the absence of light, the seedling undergoes etiolated growth, known as skotomorphogenesis, which is characterized by rapid elongation of the hypocotyl topped by a hook with underdeveloped cotyledons. When the etiolated seedling perceives the light, it begins photomorphogenesis.

What is HYPOCOTYL? What does HYPOCOTYL mean? HYPOCOTYL meaning, definition & explanation

25 related questions found

What is the function of the hypocotyl in a dicot seed?

Hypocotyl is important for 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 cotyledons), and the plumule that gives rise to the first true leaves.

What is hypocotyl example?

Storage organ. In some plants, the hypocotyl becomes enlarged as a storage organ. Examples include cyclamen, gloxinia and celeriac. In cyclamen this storage organ is called a tuber.

What is hypocotyl and epicotyl?

An epicotyl, which extends above the cotyledon(s), is composed of the shoot apex and leaf primordia; a hypocotyl, which is the transition zone between the shoot and root; and the radicle.

What is difference between radicle and hypocotyl?

The hypocotyl is the part of the seedling stem found between the cotyledons and the radicle. ... The radicle is the part occurs at the end of the hypocotyl, which develops into the root. Hypocotyl emerges after the radicle, marking the development of first leaves called cotyledon or seed leaves.

What is the difference between Plumule and hypocotyl?

The hypocotyl refers to the part of the stem of an embryo plant beneath the stalks of the seed leaves or cotyledons and directly above the root. The plumule is the tip of the epicotyl which gives rise to the shoot of the new plant.

How does the hypocotyl straighten?

In dicots, the hypocotyls extend above ground, giving rise to the stem of the plant. ... Upon exposure to light, the hypocotyl hook straightens out, the young foliage leaves face the sun and expand, and the epicotyl continues to elongate.

Do monocots have epicotyl?

In plant physiology, the epicotyl is the embryonic shoot above the cotyledons. ... 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.

What are the indicators of seed maturity?

cerasoides the change in fruit colour from green to pale red or red, moisture content of seed between 29.8 ± 1.35 and 34.13 ± 1.50%, seed length between 9.68 ± 0.12 and 11.94 ± 0.17 mm and seed width between 5.18 ± 0.14 and 8.48 ± 0.05 mm appear to be reliable indicators of seed maturity.

What happens when seed germinates?

Seed germination starts with imbibition, when the seed takes in water from the soil. This triggers root growth to allow the seed to get more water. Then, the shoots develop and grow towards the sun above ground. After the shoots reach the ground, leaves form, allowing the plant to harvest energy from the sun.

What is radicle and Plumule?

Plumule is the embryonic shoot of the plant. Radicle is the first part of the seedling. Plumule grows after the radicle. The radicle makes the root of the plant.

What does the top of the embryo in a seed become?

The top cell develops into the embryo. The first cell divisions from this top cell create a chain of cells called the proembryo. As the cell divisions continue, a globular embryo takes shape. At this point of development, cells begin to differentiate.

What is the difference between Testa and tegmen?

Testa is the outermost covering of the seed which protects the seeds from the external injury and bacterial infection whereas, tegmen is the covering of the seed that lies just under the testa.

What is Perisperm Toppr?

Perisperm is the nutritive tissue surrounding the embryo in certain seeds and developing from the nucellus of the ovule. After double fertilization, the remnants of nucellus of the ovule in the mature seed is called perisperm.

What is Epigeal and Hypogeal?

The germination can be of two types, depending on the positioning of the cotyledons or seed leaves: >If the cotyledons remain below the soil, it is called hypogeal germination. >If the cotyledons emerge on the surface of the soil, is called epigeal germination.

How the hypocotyl is different from epicotyl?

The part of the embryonal axis which exists below the cotyledon in a dicot embryo is called the hypocotyl. The part of the embryonal axis which exists above the cotyledon in a dicot embryo is known as the called epicotyl.

What epicotyl means?

: the portion of the axis of a plant embryo or seedling above the cotyledonary node.

What is Plumule and epicotyl?

The key difference between epicotyl and plumule is that epicotyl is the part of the embryonic axis which lies above the point of attachment of cotyledons while plumule is the tip of the epicotyl which gives rise to the shoot of the new plant. The seed is the ripened ovule which contains the embryo.

What is the difference between Coleoptile and Coleorhiza?

Coleoptile refers to a sheath protecting a young shoot tip in grass or cereal while coleorhiza refers to a sheath protecting the root of a germinating grass or cereal grain.

What is a petiole on a leaf?

A plant leaf is generally composed of a petiole and a leaf blade. The petiole connects the leaf blade to the plant stem and, from a structural viewpoint, it resembles a cantilever beam.

What exactly are maturity indices?

MATURITY INDICES • Maturity indices are the sign or indication the readiness of the commodity for harvest. It is the basis for determining harvest date.