sheath

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Related to Leaf sheath: ligules

sheath

1. Biology an enclosing or protective structure, such as a leaf base encasing the stem of a plant
2. the protective covering on an electric cable

sheath

[shēth]
(electricity)
A protective outside covering on a cable.
(electronics)
A space charge formed by ions near an electrode in a gas tube.
(electromagnetism)
The metal wall of a waveguide.
(science and technology)
A protective case or cover.

sheath

In reinforced concrete, an enclosure which encases posttensioned tendons to prevent their being bonded during the placement of concrete.
References in periodicals archive ?
A woman "decorticates" the leaf sheaths by holding them against an inclined wooden plank, sometimes with her leg, while using a bamboo scraper to remove the fleshy pulp of the sheath.
V1= Height of the plant; V2= Number of tillers per plant; V3= Number of fertile branches per plant; V4= Number of leaves on main tiller; V5= Length of inflorescence (cm); V6= Number of internodes on main tiller; V7= Flag leaf area (cm2); V8= 4th node leaf area of main tiller (cm2); V9= Length of internode covered by leaf sheath at 4th node (cm); V10= Thickness of stem at 4th node of main tiller (mm); V11= Number of spikelets per inflorescence
In this instance, those changes could include attack by any one of the four biocontrol agents--the wasp, scale, fly, or leaf sheath miner.
The intensity of leaf sheath and plumule pigmentation was greater for shoot fly-resistant CMS, maintainer, and restorer lines as compared with the susceptible ones (Table 1).
Auricles Clawlike appendages that project from the collar where the leaf sheath and blade join.
Leaves 2, reduced to tubular sheaths; upper leaf sheath up to 15 cm long, membranous-translucent, loose but not inflated, friable, often splitting adaxially, stramineous to pale grayish brown, apex obtuse to subacute, not callose, tooth-like projection (mucro) absent or very short; lower leaf sheath much shorter than upper, membranous, dark grayish brown to almost black.
Plant color at boot stage (Feekes growth stage 9-10) is blue green and a waxy bloom is present on the stem and flag leaf sheath.
But control has been difficult because the pest's eggs are tucked between the plant's leaf sheath and stalk, where both eggs and larvae are protected from chemical sprays.
Samples were separated into leaf blade, stem including leaf sheath, and dead fraction of tissue similar to the methodology used by Coyne and Bradford (1985).