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In botany, "seta" refers to the stalk supporting the capsule of a moss or liverwort (both closely related in a clade called "Setaphyta"), and supplying it with nutrients. The seta is part of the sporophyte and has a short foot embedded in the gametophyte on which it is parasitic .
Setaria is a widespread genus of plants in the grass family. [5] [6] The name is derived from the Latin word seta, meaning "bristle" or "hair", which refers to the bristly spikelets. [7] The genus includes over 100 species distributed in many tropical and temperate regions around the world, [8] and members are commonly known as foxtail or ...
The seta and capsules are initially green, gradually turning into brown or black colour, and elongate or expand prior to the maturation of the sporangium. [18] The long-tapered foot is responsible for transferring nutrients from the gametophyte toward the sporophyte. [ 19 ]
After fertilisation, the immature sporophyte within the archegonium develops three distinct regions: (1) a foot, which both anchors the sporophyte in place and receives nutrients from its "mother" plant, (2) a spherical or ellipsoidal capsule, inside which the spores will be produced for dispersing to new locations, and (3) a seta (stalk) which ...
Individual plants 20–30 cm (8–12 in) or more long are common in Sphagnum species for example. But even aquatic species of moss and other bryophytes needs their mature capsules to be exposed to air by seta elongation or seasonal lowering of water level to be able to reproduce. [60]
The Setaphyta are a clade within the Bryophyta which includes Marchantiophytina (liverworts) and Bryophytina (mosses). Anthocerotophytina (hornworts) are excluded. [1] [2] A 2018 study found through molecular sequencing that liverworts are more closely related to mosses than hornworts, with the implication that liverworts were not among the first species to colonize land.
Systems Engineering and Technical Advisory (SETA) contractors are government contractors who are contracted to assist the United States Department of Defense (DoD) components, and acquisition programs. (In some areas of DoD, the acronym SETA refers to "Systems Engineering and Technical Assessment" contractors; also refers to "Systems ...
The adult plant body is foliose gametophyte which is leafy and branched which is differentiated into axis, leaves, rhizoids. Axis/Stem: Small, erect, upright, slender, monopodially branched Leaves: Spirally arranged around the axis. Flat, green with a well-defined mid-rib. Lower leaves are smaller and scattered and upper leaves are large and ...