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Cannaversity .: Glossary

Glossary


Terms in glossary: 321.

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Damping-off
A dangerous soil-borne fungus disease which attacks seedlings and young plants.
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Decarboxylation
This occurs after buds are harvested and during the curing process. The THC loses a CO2 molecule, which then makes the THC psychoactive. This process is why drying and curing buds after harvest is crucial to the high that the bud produces.
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Decussate Phyllotaxy
Leaves appear in opposite pairs along the stem.
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Dehiscence
Release of pollen from the stamens upon opening of the staminate flower.
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Differentiation
(1) process of mixing heterozygous gene pools by crossing to promote variation in the offspring. (2) development by a plant of specialized tissues, e.g., roots, calyxes, pistils.
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Dihybrid Cross
a hybrid cross for two traits.
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Dioecious
Staminate and pistillate organs develop on separate plants.
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Diploid
The 2n or vegetative condition where each cell has the usual two sets of homologous chromosomes( in Cannabis 2n=20).
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Disinfectant
A treatment that kills disease organisms on the exterior of the seed or plant.
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Distal
Oriented away from another surface.
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Domesticated
Cultvated or spontaneously appearing in a cultivated area.
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Dominant Trait
The trait which is expressed in the phenotype of a heterozygous gene pair, indicated by a capital letter, i.e., "W" is dominant; "w" is recessive.
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Drip Irrigation
irrigation system that delivers water to individual plants in small amounts at regular, frequent intervals.
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Ecosystem
Community of organisms living interdependently in the physical environment.
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Ecotype
A strain of plant adapted to a specific niche in the ecosystem.
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Embolism
bubble of air in the transpiration stream of a cutting, will usually prevent cutting from becoming an active clone.
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Endosperm
nutrient tissue contained within the seed.
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Endothecium
Subepidermail layer of the pollen sack wall.
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Endozoic
internal.
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Epicotyl
Stem between the cotyledons and the first pair of true leaves.
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Epidermal Layer
Outer layer of plant tissue.
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Epinasty
Downward curling of cotyledons and leaves at night.
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Essential Oils
Compounds with strong aromas contained in the secreted resins of plants.
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Etiolation
Growth of a plant in total darkness to increase the chances of root initiation.
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F1
first filial generation: the offspring of two P1 (parent) plants.
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