Laminariales


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Laminariales

[‚lam·ə‚nar·ē′ā·lēz]
(botany)
An order of brown, large, structurally complicated, often highly differentiated members, commonly called kelps, of the algal class Phaeophyceae; distinctive features include a life history in which microscopic, filamentous, dioecious gametophytes alternate with a massive, parenchymatous sporophyte, and a mature sporophyte typically consisting of a holdfast, stipe, and one or more blades.

Laminariales

 

(kelps), an order of brown algae.

The Laminariales are the largest marine plants (to 10–15 m and more in length). The thallus consists of a simple or branched stipe, with rhizoids or a foot at the base, that bears one or more large blades. The conducting elements are sievelike tubules, similar in structure to the phloem cells of flowering plants, and serve to transport the products of photosynthesis. Laminariales grow by means of a growth zone located at the base of the blade and in the upper part of the stipe. The holdfasts and the stipe are usually perennial; the blades are destroyed annually. Once a year the blades yield zoospores, which develop into microscopic gametophytes. The sexual process is oogamy. The egg cell does not separate from the gametophyte; a new, large thallus (sporo-phyte) grows in its place.

There are about 30 genera of Laminariales (100 species), living principally in temperate and cold seas; they are found in all of the northern and Far Eastern seas of the USSR. Laminariales are used as food, for medical purposes (for example, sea kale), as cattle fodder, for fertilizer, and to obtain alginic-acid salts and mannitol.

LU. E. PETROV

References in periodicals archive ?
In Laminariales, carbohydrates can evidence an inverse seasonal pattern to that described for nitrogenous compounds (Rosell & Srivastava, 1985; Schiener et al., 2015).
Suringar (Laminariales, Phaeophyta) on the Pacific Coast of Mexico.
It also negatively affects the growth of coastal seaweeds (Macrocystis and other laminariales).
Survey on sexual pheromone specificity in Laminariales (Phaeophyceae).
Nitrogen uptake kinetics in three year-classes of Laminariu groenlandica (Laminariales: Phaeophyta).
Desarrollo y aplicaciones del cultivo de Saccharina latissima (Laminariales, Ochrophyta) en sistemas de acuicultura multitrofica integrada (AMTI).
The subtidal habitats of continental Chile are dominated by brown algae, primarily from the Order Laminariales, which form extensive forests with an understory dominated by crustose algae (Palma & Ojeda, 2002; Perez-Matus et al., 2007).
Morphological variations do not effectively reduce drag forces at high wave-exposure for the macroalgal species, Hedophyllum sessile (Laminariales, Phaeo-phyta).
Laminariales) is an important habitat-structuring component of shallow, benthic communities throughout central and southern California.
Photosynthetic and light-independent carbon fixation in Macrocystis, Nereocystis, and some selected Pacific Laminariales. Canad.
Growth of juvenile Macrocystis pyrifera (Laminariales) in relation to environmental factors.
Development of techniques for the cultivation of Lessonia trabeculata (Phaeophyceae: Laminariales) in Chile.