Zoospores


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Zoospores

 

zoogonidia, or swarm spores, special cells in many algae and some lower fungi that are capable of moving in water like protozoans by means of flagella, whose number varies in different species (usually two, more rarely one, four, or more).

Zoospores function in asexual reproduction and settlement. In contrast to typical plant cells, zoospores do not have a rigid membrane. The zoospores of many algae have, in addition to a chromatophore, red ocelli and pulsating vacuoles. The movement of zoospores is forward and rotary; after some time a zoospore stops, loses its flagella, secretes a rigid membrane, and develops into a new alga or fungus organism. The cells in which zoospores are formed are called zoosporangia.

References in periodicals archive ?
Most pears float at the water surface, where they attract motile Phytophthora zoospores. For the occasional nonfloating pear, a pear floatation device can be made by using a rubber band to attach a small piece of closed-cell foam.
We estimated that the population of the zoospores in the HCS in which strain J10 polyps and other non-symbiotic polyps were co-cultured was 250-2000 m[L.sup.-1] (888 [+ or -] 608, mean [+ or -] SD, n= 12).
A Reliable Method for Phytophthora cajani Isolation, Sporangia, Zoospore Production and in Planta Infection of Pigeonpea.
It was generally accepted that in rainy season, owing to devitalizing effect on skin barriers, high relative humidity had significant influence on maturation and motility of infective zoospores and motility had been claimed to be a major predisposing factor in spread and epidemiology of dermatophilosis (Yeruham et al., 2003).
Propineb and Phenylamide are effective to prevent several stages of the fungal development cycle such as the release and the motility of zoospores, the germination of cysts as well as the growth of mycelium and sporulation (Fernandez-Northcote et al., 2000; Lazzari et al., 2008).
In our cultures of the oomycete Sommerstorffia spinosa, zoospores often concentrate at the water's surface; they probably swim upwards due to an inherent negative geotaxis that has been postulated for all oomycete zoospores (Carlile 1986).
We evaluated the development of sporangia and zoospores in sporulation medium (see above).
In addition, the isolates are multiplied using their zoospores, which could be a continued source of new variability, even for originally single zoosporangium isolates.
Exposure to ultraviolet radiation delays photosynthetic recovery in Arctic kelp zoospores. Photosynth Res.
The initial infection-spreading cells of the fungus, called zoospores, swim by lashing a hair-like flagellum and don't have a cell wall.
Although Bd skin infections can kill metamorphs and adults, most larvae (= tadpoles) survive when infected and may serve as reservoirs of infective zoospores (Lips, 1999; Lips et al., 2003, 2004; Daszak et al., 2004).