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Cannaversity .: Glossary

Glossary


Terms in glossary: 321.

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Mutation
an inheritable change in a gene.
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Necrosis
Death of parts of the plant, usually refers specifically to the leaves.
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Necrosis or necrotic spots
Plant tissue browns and dies. Tissue which has already died on a still-living plant is called necrotic.
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Nitrification
Conversion by soil organisms of atmospheric nitrogen to a form which can be used by the plant.
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Node
The point on a stem where a leaf is attached or has been attached; a joint.
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Nucellus
Tissue within the ovule.
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Ontogeny
course of development.
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Organelles
Structures within a single cell.
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Ovule
Section of the female flower containing the haploid (1n) gamete which will form a seed upon fertilization.
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P1
first parental generation, the parents crossed to form F1 or F1 hybrid offspring.
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Parthenocarpy
The production of seeds without fertilization.
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Pathogen
an organism causing a specific disease.
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Peat moss
The partially decomposed remains of mosses. Though difficult to wet initially, peat moss can absorb up to 25 times its own weight in water and is therefore valued as a an organic soil amendment. Peat moss is acidic with a pH of about 3 or 4.0 and should only be used around acid-loving plants or to help lower the pH of alkaline soils.
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Pedicel
Point of attachment of staminate or pistillate calyx.
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Pentyl
A 5-carbon group.
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Perianth
Outer seed coat, displaying seed color and pattern.
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Pericarp
Protective outer seed covering or shell.
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Periclinal
parallel to the surface.
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Perisperm
Nutrient region of the seed.
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Perlite:
A unique volcanic mineral which expands from four to twenty times its original volume when it is quickly heated to a temperature of approximately 1600-1700 degrees F. This expansion is due to the presence of two to six percent combined water in the crude perlite rock which causes the perlite to pop in a manner similar to that of popcorn.When expanded, each granular, snow-white particle of perlite is sterile with a neutral pH and contains many tiny, closed cells or bubbles. The surface of each particle is covered with tiny cavities which provide an extremely large surface area. These surfaces hold moisture and nutrients and make them available to plant roots. In addition, because of the physical shape of each particle, air passages are formed which provide optimum aeration and drainage. Because perlite is sterile, it is free of disease, seeds, and insects. Has been used throughout the world for soil conditioning and as a component of growing mixes with materials such as peat moss or bark. Extensive studies have shown that the unique capillary action of perlite makes it a superior growing media for hydroponic cultures.
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Petiole
The leaf stalk that attaches a leaf to the plant.
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PH
The measure of soil's acidity or alkalinity, measured on a scale of 1 to 14. Water is considered neutral at PH 7. PH levels below 7 are classified as acidic, or "sour". Levels above 7 are basic, alkaline or "sweet". Most plants prefer a slightly acidic soil pH of 5.7 to 6.5.
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Phenotype
outwardly measurable characteristics of an organism determined by the interaction of the individual genotype with the environment.
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Phloem
Nutrient conducting tissue.
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Photoperiod
The on and off cycle of light, the number of hours of light and darkness the plant is exposed to. Usually expressed as a fraction. Ex: 18/6 = 18 hours of light, and 6 hours of darkness.
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