Radial spines
Термины кактусовода
Spines located on the periphery of the areole.
Glossary of terms
A reference section with categories and short explanations.
Root system
Термины кактусовода
The collection of a plant's underground roots. The taproot system has a primary root and lateral roots; the fibrous or fasciculate system — the primary root is weakly developed or dies early, and adventitious roots form a cluster, a fascic…
Root collar
Термины кактусовода
The point where the roots transition into the stem.
Root hairs
Термины кактусовода
Absorbing, dying off as the root grows.
Root primordia
Термины кактусовода
Groups of cells from which new roots develop.
Root suckers
Термины кактусовода
Shoots arising from adventitious buds.
Root parasites
Термины кактусовода
Plant pests that damage roots.
Rootlets
Термины кактусовода
Thin lateral root branches that break off when the root is removed from the soil.
Radicle emergence
Термины кактусовода
The emergence of the embryonic root through the rupture of the testa during seed germination.
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.
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.
Rarity
Термины кактусовода
Rarity, a rare specimen; an exceptionally rare plant both in terms of being held in collections and of occurring in natural conditions.
Regeneration
Термины кактусовода
Restoration by a living organism of lost body parts.
Reduction
Термины кактусовода
Decrease in size of plant organs or tissues.
Radish-like roots
Термины кактусовода
(Not napiform) thickening of the taproot.
Relict plants
Термины кактусовода
Dying out; surviving in small numbers.
Replantation
Термины кактусовода
Engraftment (survival) of a detached organ.
Receptaculum
Термины кактусовода
(Lat. term receptaculum - receptacle - the axis of the flower on which the sepals, petals, stamens, carpels are arranged) - a term used by many cactologists to denote the receptacle specific to all higher cacti.
Recessive
Термины кактусовода
(From Latin recessus - retreat, removal) - an allele whose phenotypic expression in the heterozygote is masked by the dominant allele.
Reciprocal crosses
Термины кактусовода
(From Latin reciprocus - mutual) - two crosses characterized by a mutually opposite combination of the trait under study and the sex of the forms participating in these crosses.
Rhizoctoniosis
Термины кактусовода
Fungal disease of cacti.
Rootstock segments
Термины кактусовода
Parts of a long cactus shoot, each of which is used as a rootstock without being rooted.
Rooting
Термины кактусовода
The process of root formation.
Receptacle
Термины кактусовода
The upper expanded part of the pedicel.