Question

what is ligule? Define its function

Answer 1

A ligule — is a thin outgrowth at the junction of leaf and leafstalk of many grasses and sedges. A ligule is also a strap-shaped extension of the corolla, such as that of a ray floret in plants in the daisy family Asteraceae.
it's features include the presence of agranal plastids with well developed internal tubule systems, and complex lomasomes. Many Golgi vesicles are produced, and accumulate in the groundplasm. Some of these pass into cell vacuoles (where breakdown occurs), others fuse with the plasmalemma (where discharge of contents to the outside may take place).

Answer 2

A ligule is a strap-shaped extension of the corolla, such as the one found on a ray floret in Asteraceae plants. Ligules are secretory organs

Ligule

• Many grasses (Poaceae) and sedges have a thin outgrowth at the junction of leaf and leafstalk called a ligule (from Latin: ligula "strap," variation of lingula, from lingua "tongue").
• A ligule is a membrane-like tissue or a row of fragile hairs that can be found at the junction of the leaf sheath and blade in grasses.
• The ligule looks to be a continuation of the leaf sheath and, like the leaf sheath, encircles or clasps the stem.
• Membranous ligules, ciliate ligules, and missing or lacking ligules are the three primary forms of ligules.
• Most grasses have ligules, and the form, length, and appearance of the ligule edge can be used to distinguish genera and species of grasses.

Function of Ligule

• The ligule's 'role' has always been one of defence. This protection is achieved by keeping water, dust, and harmful spores out of the plant's 'interior,' or by safeguarding the growing leaf or floral apex ('bud') in some unspecified way.
• Ligules are secretory structures that help to keep new leaves and sporangia moist by releasing water and perhaps mucilage. They are short-lived structures that shrink and fade away in older leaves.

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