| plant growth regulators | Any of the hormones produced naturally in plants and active in controlling growth and other functions. There are three primary classes: auxins, cytokinins, and gibberellins. (12 Dec 1998) |
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| plant growth substances | <plant biology> Substances that, at low concentration, influence plant growth and differentiation. Formerly referred to as plant hormones or phytohormones, these terms are now suspect because some aspects of the hormone concept, notably action at a distance from the site of synthesis, do not necessarily apply in plants. Also called plant growth regulators. The major classes are absicisic acid, auxin, cytokinin, ethylene and gibberellin, others include steroid and phenol derivatives. (31 Dec 1997) |
| plant indican | 1. <chemistry> A glucoside obtained from woad (indigo plant) and other plants, as a yellow or light brown sirup. It has a nauseous bitter taste, a decomposes or drying. By the action of acids, ferments, etc, it breaks down into sugar and indigo. It is the source of natural indigo. 2. <physiology> An indigo-forming substance, found in urine, and other animal fluids, and convertible into red and blue indigo (urrhodin and uroglaucin). Chemically, it is indoxyl sulphate of potash, C8H6NSO4K, and is derived from the indol formed in the alimentary canal. Synonym: uroxanthin. See: Indigo. Source: Websters Dictionary (01 Mar 1998) |
| plant leaves | Expanded structures, usually green, of vascular plants, characteristically consisting of a bladelike expansion attached to a stem, and functioning as the principal organ of photosynthesis and transpiration. (12 Dec 1998) |
| plant oils | <plant biology> Oils such as palm oil, flax oil, and cocoa, used for a wide variety of commercial purposes, and consequently a major focus of the biotechnology industry. (31 Dec 1997) |
| plant physiology | Physiological functions characteristic of plants. (12 Dec 1998) |
| plant poisoning | Poisoning by the ingestion of plants or its leaves, berries, roots or stalks. The manifestations in both humans and animals vary in severity from mild to life threatening. In animals, especially domestic animals, it is usually the result of ingesting moldy or fermented forage. (12 Dec 1998) |
| plant proteins | Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which vegetable proteins is available. (12 Dec 1998) |
| plant RNase | <enzyme> An enzyme endonucleolytically cleaving RNA to 3'-nucleotides with 2',3'-cyclic nucleotides as intermediates. Synonym: Escherichia coli RNase I, microbial RNase II, plant RNase, RNase N2. (05 Mar 2000) |
| plant root cap | A cone-shaped structure in plants made up of a mass of meristematic cells that covers and protects the tip of a growing root. It is the putative site of gravity sensing in plant roots. (12 Dec 1998) |
| plant roots | The usually underground portions of a plant that serve as support, store food, and through which water and mineral nutrients enter the plant. (12 Dec 1998) |
| plant shoots | The aerial portions of a plant, including stem, branches, and leaves and also, new immature growth on a plant. (12 Dec 1998) |
| plant stems | Parts of plants that usually grow vertically upwards towards the light and support the leaves, buds, and reproductive structures. (12 Dec 1998) |
| plant succession | <botany> The development of a plant community from its initial stage to its climax stage. (31 Dec 1997) |
| plant toxin | A substance similar in its properties to an extracellular bacterial toxin. Synonym: plant toxin. Origin: phyto-+ G. Toxikon, poison (05 Mar 2000) |