Laticifers


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Laticifers

 

in plants, the vessels (tubules, cells) containing latex, a milky juice; they are characteristic of certain species of plants of the families Apocynaceae, Euphorbiaceae, Asclepiadaceae, Compositae, Papaveraceae, and others. Laticifers are grouped in two classes: the articulated and the nonarticulated. The former originate as a result of the opening of the septa between the latex cells. Nonarticulated laticifers are formed by the growth and branching of cells that already exist in the plant embryo. Laticifers are usually found in all the plant organs, forming a special system; however, a number of plants, such as Euonymus and Eucommia, have separate, long cell chains that are not joined in a system.

Living laticifers have a parietal layer of cytoplasm, numerous distinctively shaped nuclei, all the other structures of a living cell, and a cellulose casing. The atrophy of old laticifers and the formation of new ones usually occur simultaneously in the plant. When laticifers atrophy, the milky juice coagulates and is converted into a uniform, solid mass. When there are injuries to plants, the milky juice flows out of the living vessels under turgor.

The physiological role of laticifers is not known. The best substantiated theory suggests that the vessels are the receptacles in which the end products of metabolism accumulate. Laticifers probably perform the role of excretory systems in plants.

O. L. CHISTIAKOVA

References in periodicals archive ?
Laticifers was described from secondary phloem samples of the trunk by were fixed in Karnovsky solution (Karnovsky, 1965), dehydrated in 50, 70 and 80% alcohol, embedded in HistoResin (hydroxyethylmethacrylate; Leica, Germany), following the manufacturer's instructions, and cut in a semiautomatic microtome.
This demonstrates the efficiency of the secretion contained in laticifers in sealing injured areas, preventing the entry of microorganisms (Demarco et al., 2006).
Laticifers possess radial distribution in the secondary phloem trunk of F.
In Brosimum gaudichaudii the perpendicular distribution of laticifers in rays of roots was also described (Palhares et al., 2007).
Ontogeny and cytochemistry of alkaloidal vesicles in laticifers of Papaver somniferum, American Jour.Bot, (64): 541-551.
Laticifer ultrastructure and differentiation in seedlings of Papaver bracteatum, Papulation Arya II, American Journal of Botany, (65): 978-983.
The presence of laticifers in Caricaceae is clearly an apomorphy; laticifers are unknown elsewhere in Brassicales.
Laticifers have been only observed in members of Cacteae (Coryphantha, Leuchtenbergia, and species of two Mammillaria sections) by Mauseth (1978a, 1978b).
The structure and development of an unusual type of articulated laticifer in Mammillaria (Cactaceae).
Since Hanstein's (1864) study, most genera of aroids have been reported as having laticifers (French, 1988; Keating, 2003).
The fact that both anas and non-a laticifers are found in different genera of tribe Colocasieae suggests a point from which to investigate their potential evolutionary relationships or trends.
These include types or states of ground tissue, vascular bundles, fibers, trichosclereids, collenchyma, and laticifers.