coleoptile

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coleoptile

a nonchlorophyllous protective covering over the growing shoot (PLUMULE) of young plant seedlings in certain MONOCOTYLEDONS (e.g. oats) that is the first structure to break through the soil into the air after germination. As growth proceeds the coleoptile is ruptured by the first foliage leaf of the enclosed shoot. Oat coleoptiles have been used extensively in experiments with AUXINS.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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Fifty single coleoptiles of both the hybrids and their parental lines were analyzed with this isozyme to detect off types.
the com coleoptiles. These variations in responses to light suggest the
The extracts were used in the bioassay of etiolated wheat coleoptiles. To perform this experiment, Triticum aestivum etiolated coleoptiles, obtained from seedlings grown in water for three days under 25[degrees]C in the absence of light, were cut into 4 mm lenght fragments with a Van Der Veij guillotine under a green safety light.
Naphthylphthalamic acid binding sites on maize coleoptile membranes as possible receptor sites for phytotropin action," Plant Physiology, vol.
Went found that the tip of the coleoptiles could be cut off and placed on a tiny block of agar (the gelatin-like material made from certain marine algae that maintains liquid in a semisolid state at room temperature).
The longer coleoptiles and larger root systems of tall cultivars compared with the semidwarfs likely contributes to their relative adaptation to dry environments, where deep sowing ensures contact with available soil moisture (Rebetzke and Richards, 2000; Trethowan et al., 2001).
In his book The Power of Movement in Plants (Darwin, 1880), he describes the effects of light on movement of coleoptiles. In 1928, Went developed a method for the quantification of plant growth substances present in a sample, which was called the Avena curvature bioassay and is still commonly used today (Figure 10-9).
In other systems (growing stems, hypocotyls, and grass coleoptiles) auxin treatment induces cells to acidify their cell walls, apparently through activation of a plasma membrane H+-ATPase.
With these considerations as background, we tried to assess the role of microtubules and microfilaments in the gravitropic response of rice coleoptiles. The rice coleoptile is highly sensitive to gravity, and the abundance of amyloplasts can be controlled by submerged growth.
the coleoptiles may not be able to reach the soil surface, leaving farmers with a spotty or nonexistent crop.
Acid phosphatases are enzymes highly expressed in plants and especially in plant tissues such as roots, bulbs, seeds, tubers, coleoptiles and leaves (Yan et al.