Ovary
Cactus grower terms
The lower, enlarged part of the pistil that contains the ovules.
Glossary of terms
A reference section with categories and short explanations.
Own-root plants
Cactus grower terms
Plants that develop on their own roots and do not require grafting.
Pamperos
Cactus grower terms
Winds from Argentina and Uruguay, blowing from the extensive grassy plains — the pampas.
Parasites
Cactus grower terms
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
Cactus grower terms
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
Cactus grower terms
An organism capable of causing disease.
Pathogenic flora
Cactus grower terms
A collection of pathogenic microorganisms.
Pectinate prickles
Cactus grower terms
Prickles arranged in the form of a ridge.
Pedicel
Cactus grower terms
A flower stalk bearing a single flower.
Perianth
Cactus grower terms
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.
Period of dormancy
Cactus grower terms
A periodically recurring state in which a cactus shows no visible signs of growth.
Peripheral root system
Cactus grower terms
The part of the root system farthest from the stem and performing the main function of roots - absorption of solutions.
Perisperm
Cactus grower terms
(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.
Perlite
Cactus grower terms
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…
Phenological types of plants
Cactus grower terms
Plants with similar duration and timing of the onset and end of the vegetative period and dormancy.
Phenology
Cactus grower terms
System of knowledge about seasonal phenomena of nature and the timing of their changes.
Phenotype
Cactus grower terms
(From Greek phaino - I appear, I reveal and type) the aggregate of all traits and properties of an individual that have formed in the process of interaction between its genotype and the external environment. In other words, a particular ca…
Photoperiodism
Cactus grower terms
Plants' response to the relative lengths of day and night. The primary characteristic is flowering.
Photosynthesis
Cactus grower terms
The process by which plants produce organic substances using the energy of sunlight captured by chlorophyll.
Phototropism
Cactus grower terms
Orientation of axial organs (stem, root) to illumination, manifested as directed growth or bending of them toward light (+Ф) or away from light (-Ф).
Phototype
Cactus grower terms
Photograph of the type specimen.
Phylogenesis
Cactus grower terms
The process of historical development of both individual species and systematic (taxonomic) groups. Closely related to ontogeny. Depicted as a phylogenetic tree.
Phylogenetic relationships
Cactus grower terms
Relationships between groups of plants that form the basis of categorization.
Physiologically active substances
Cactus grower terms
Organic substances, growth regulators (auxins, etc.).
Phytocenosis
Cactus grower terms
A stable community of plants of one or many generations, uniform within itself but different from neighboring ones.
Phytoncides
Cactus grower terms
Antimicrobial substances of plant origin.
Phytophthora disease
Cactus grower terms
Fungal disease of cacti.
Pigment
Cactus grower terms
(From Latin pigmentum - paint) - colored compounds that occur in the tissues of an organism; their color is determined by the selective absorption of sunlight
Pistil
Cactus grower terms
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.
Plant adaptation
Cactus grower terms
The totality of structural and physiological characteristics of an organism and plant responses, including genetic changes, that ensure the ability to exist under specific environmental conditions and the resilience required for preservati…
Plant morphology
Cactus grower terms
Branch of botany that studies the regularities of structure and the processes of morphogenesis in plants during the life processes of their generations from their origin to the present species (in their ontogeny and phylogeny).
Plant odor
Cactus grower terms
Scorching, discoloration of the stem caused by overheating of the air or by its high dryness.
Plant physiology
Cactus grower terms
A branch of botany that studies the general patterns of the life activities of plant organisms (metabolism, nutrition, growth, reproduction, developmental phases).
Plant reproduction
Cactus grower terms
Reproduction of individuals through the process of propagation.
Plant systematics
Cactus grower terms
A branch of botany that develops a natural classification of plants based on the study of the origins and causes of formation of particular taxonomic units, including analysis of their historical development and the establishment of stable…
Plastids
Cactus grower terms
(From Greek plastides - creators, formers) - cellular organelles in which synthesis and transformations of substances and energy, etc., take place.
Pleiokotylia
Cactus grower terms
(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.
Point (spot) mutation
Cactus grower terms
Insertion, deletion, or alteration of one of the nucleotides in a molecule of chromosomal DNA.
Pollination
Cactus grower terms
Transfer of pollen from the anthers of stamens to the stigma of the pistil.
Population
Cactus grower terms
A noticeable number of individuals of a single species, freely interbreeding with one another, occurring within a defined territory and separated from similar aggregations.