What is ligule and auricle?
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What is ligule and auricle?
The auricle is a hairy and sickle-shaped organ that surrounds the culm, thus keeping the leaf sheath and culm together. The ligule is a thin and tongue-like white membrane that keeps the leaf sheath closed tightly against the auricles to prevent rainwater or dust from entering.
What are Auricles in plants?
Definition. An ear-shaped appendage; for example, on the lip of an orchid or at the apex of the leaf sheath of Poaceae; also used for appendices not so ear-shaped, for example the appendices arising at the junction between the claw and the blade of clawed petals.
What is ligule and its function?
Of the three component organs of the grass leaf – blade, sheath and ligule – the ligule is the least studied and the least understood. Traditionally, it has been assumed to act in a passive way in protecting the culm and leaves that it encloses from the entry of water, dust and harmful spores.
What is ligule definition?
Definition of ligule : a scalelike projection especially on a plant: such as. a : a thin appendage of a foliage leaf and especially of the sheath of a blade of grass. b : a ligulate corolla of a ray floret in a composite head.
Are auricle and atrium same?
In humans the atria are the two upper chambers of the heart. Each is roughly cube-shaped except for an ear-shaped projection called an auricle. (The term auricle has also been applied, incorrectly, to the entire atrium.)
What is Lemma and Palea?
Palea is the bracelets that grow on a compound flower’s receptacle. Lemma is one of the specialized bracts around florets in grass.
What are Ligules leaves?
Ligule: The membranous appendage arising from the inner surface of the leaf at the junction with the leaf sheath in many grasses and some sedges.* In grasses, the ligule is an important identification characteristic.
What is ligule example?
Poaceae and Cyperaceae Some grasses do not have a ligule, for example barnyardgrass (Echinochloa crus-galli). A ligule can also be defined as a membrane-like tissue or row of delicate hairs typically found in grasses at the junction of the leaf sheath and blade.
What is the difference between auricle and ventricle?
Main Difference – Auricle vs Ventricle Auricle refers to the upper chambers of the heart in lower animals such as mollusks. In mammals such as humans, the auricle refers to an appendage of the atrium. Ventricle refers to the lower chambers of the heart.
What is palea in flower?
Palea, in Poaceae, refers to one of the bract-like organs in the spikelet. The palea is the uppermost of the two chaff-like bracts that enclose the grass floret (the other being the lemma). It is often cleft at the tip, implying that it may be a double structure derived from the union of two separate organs.
What is the meaning of palea?
Definition of palea 1 : one of the chaffy scales on the receptacle of many composite plants. 2 : the upper bract that with the lemma encloses the flower in grasses.
What are ligules function?
Is atrium and auricle same?
What is the difference between auricle and atrium?
The main difference between atrium and auricle is that atrium is a compartment of the heart whereas auricle is a small out-pouching of the atrium. Heart is composed of two atria and two ventricles. Atria are the upper compartments while ventricles are the lower compartments.
What is lemma and palea?
What is function of lemma and palea *?
In rice, RETARDED PALEA1 (REP1) promotes the differentiation of the palea and the lemma (which together function as a calyx surrounding the stamens and carpel) by regulating cellular expansion and differentiation (Yuan et al., 2009).
What are Lodicules?
Definition of lodicule : one of usually two delicate membranous hyaline scales at the base of the ovary of a grass that by their swelling assist in anthesis.
