Nucleotide
Термины кактусовода
An individual structural unit of a nucleic acid, consisting of a phosphate, a five-carbon sugar, and a purine or pyrimidine.
Glossary of terms
A reference section with categories and short explanations.
Nucellus
Термины кактусовода
(From Latin nucella - nutlet) - the central multicellular part of the ovule, surrounded by coats (integuments).
Species aggregation
Термины кактусовода
The pattern of distribution of individuals of a species in nature: isolated from one another, in small groups, as separate populations distant from each other and, finally, in large groups, clumps, patches and thickets.
Lignification
Термины кактусовода
The final phase of cellular life, when cell walls become rigid and strong and the cells ultimately die.
Perianth
Термины кактусовода
The set of leaf-like parts in a flower that surround the stamens and pistil. In a simple perianth there are only the petals of the corolla; in a double perianth — the petals and the sepals of the calyx.
Ontogeny (ontogenesis)
Термины кактусовода
Individual development, the entire complex of a plant's life activities and structure, beginning with its origin from a fertilized egg cell, a vegetative bud, or the division of a mother cell, and continuing until the plant's death.
Litter
Термины кактусовода
Dead plant parts that have fallen onto the soil surface and constitute the main portion of the decomposition products that form the soil's organic structure.
Suberization
Термины кактусовода
Change in the walls of plant cells due to the deposition of lipid-like substances in them, which leads to the formation of hard tissues that worsen the appearance of plants but serve as protection against excessive transpiration, penetrati…
Pubescence
Термины кактусовода
Presence of hair-like outgrowths on the epidermis of many plants.
Pollination
Термины кактусовода
Transfer of pollen from the anthers of stamens to the stigma of the pistil.
Organic matter
Термины кактусовода
A component of soil that is of plant or animal origin.
Organic constituents
Термины кактусовода
Complex compounds of the substrate's soil fractions formed as a result of the decomposition of organic substances, for which carbon is an essential element.
Osmosis
Термины кактусовода
(From Greek osmos - pressure, push) - the ensemble of physico-chemical processes leading to thermodynamic equilibrium and the equalization of solution concentrations on both sides of a membrane. It is ensured by the slow transfer of low-mo…
Osmotic gradient
Термины кактусовода
Difference in osmotic pressure across a membrane.
Osmotic pressure
Термины кактусовода
Excess external pressure that must be applied to the solution side to stop osmosis — the influx of solvent into it through the semipermeable membrane separating them.
Individual
Термины кактусовода
A single living organism possessing all the characteristics of the species to which it belongs, while at the same time having morphological and physiological features that distinguish it from other organisms of the same species.
Relative humidity
Термины кактусовода
Expressed as the ratio of the concentration of water vapor contained in the air to its maximum saturated state at a given air temperature. As temperature increases, relative humidity decreases.
Dead parts remaining on the root
Термины кактусовода
Dead parts remaining on the plant's root.
Offshoot
Термины кактусовода
A young shoot of a plant arising from the stem or root. Among hobbyists the terms "shoot" or "plantlet" are more commonly used.
Pamperos
Термины кактусовода
Winds from Argentina and Uruguay, blowing from the extensive grassy plains — the pampas.
Parasites
Термины кактусовода
In this case, plants that parasitize other plants, i.e., living on the surface of a host and obtaining from it food in the form of ready-made organic substances.
Pasteurization
Термины кактусовода
A method of disinfecting biological substances, the essence of which is that conditions favorable for the development of microorganisms are first created and their spores germinate, then the temperature is raised and the active microbes di…
Pathogen
Термины кактусовода
An organism capable of causing disease.
Pathogenic flora
Термины кактусовода
A collection of pathogenic microorganisms.
Cross-pollination
Термины кактусовода
Fertilization of a flower by pollen from another plant.
Period of dormancy
Термины кактусовода
A periodically recurring state in which a cactus shows no visible signs of growth.
Perisperm
Термины кактусовода
(From Greek peri - near, about and sperma - seed) - a storage tissue of the seed used by the embryo during germination; develops from the nucellus and consists of diploid cells.
Peripheral root system
Термины кактусовода
The part of the root system farthest from the stem and performing the main function of roots - absorption of solutions.
Perlite
Термины кактусовода
Granular quartz, a porous white mineral substrate that can replace sand. When thermally treated, perlite and vermiculite produce a lightweight, expanded material. Incorporating these components into the soil significantly improves its phys…
Pistil
Термины кактусовода
The female organ of a flower, formed by one or several carpels. Consists of a lower hollow, usually swollen part - the ovary, a slender style, and a stigma of various shapes.
Pigment
Термины кактусовода
(From Latin pigmentum - paint) - colored compounds that occur in the tissues of an organism; their color is determined by the selective absorption of sunlight
Pricking out
Термины кактусовода
Transplanting seedlings.
Pyrophytes
Термины кактусовода
Plants that develop in burned areas.
Plastids
Термины кактусовода
(From Greek plastides - creators, formers) - cellular organelles in which synthesis and transformations of substances and energy, etc., take place.
Pleiokotylia
Термины кактусовода
(From Greek pleion - more, and kotyledon - cup-shaped vessel) - the phenomenon of formation in the embryo of more than two cotyledons, multicotyledony (synonym - politilia). Characteristic of gymnosperms.
Fruiting buds
Термины кактусовода
Buds that produce flowers after opening.
Assimilation area
Термины кактусовода
See "assimilation surface".
Shoot
Термины кактусовода
Axial organ of higher plants with apical growth; in scientific terms a broader concept than stem or trunk, although among hobbyists it refers to daughter lateral offshoots on mature cactus specimens or their stumps.
Rootstocks
Термины кактусовода
Plants onto which scions are grafted. They primarily perform the function of roots, and their task is to actively supply the scion (see below) with nutrients.
Hypocotyl
Термины кактусовода
Part of the plant located below the cotyledons.