Lagenidiales, Perenosporales Uniflagelate, Whiplash and Posteriorly positioned Uniflagelate, Tinsel and Anteriorly positioned Biflagellate, Unequal Whiplash, Anteriorly positioned Biflagellate, Unequal-One Whiplash and the other tinsel, Anteriorly positioned Classification of the Mastigomycotina into various classes and orders
CLASS - CHYTRIDIOMYCET ES
CLASS - Chytridiomycetes • Formerly referred to as Chytrids and characterized by the presence of motile cells or zoospores made up of a single, posteriorly positioned, whiplash flagellum. • Mycelium is non-septate, diploid and form resting spore or sporangium. The thallus can be holocarpic or eucarpic while some posses non- nucleate rhizomycelium or rhizoids • Their chief wall component is chitin and β -glucan, and exist as parasites of higher plants ( Synchytrium, Olpidium, Physoderma ), algae ( Phlyctochytrium ) and a few aquatic animals ( Coelomomyces, Batrachochytrium ). • They reproduce both sexually and asexually by spores while capable of sexual reproduction by any of the following methods (i) planogametic copulation e.g. Olpidium, Synchytrium , (ii) gametangial copulation e.g. Zygorhizidium
Mycelium Fig. 12: Illustration of varied mycelia formed by members of the Class-Chytridiomycetes
The Class – Chydridiomycetes comprised 4 Orders separated on the basis of their LIFE CYCLE. The 4 orders are as presented.
Order - Chytridiales • The order Chytridiales comprised more primitive members of the Class-Chytidiomycetes and live as either parasites of algae, other chytrids, aquatic fungi, animals (mosquito lavae, fish eggs, amphibians, rotifers, insects exoskeleton or saprophytes (plant debris). • Their unique features include coenocytic unbranched monocentric and polycentric thalli. The monocentric thallus may be: (i) Endobiotic – thallus occur completely within the living host (obligate parasite); (ii) Epibiotic – thallus occur partly within (somatic structure) and partly outside(reproductive structure) the host; (iii) Interbiotic – thallus rhizoidal part occur within the host with the most part outside.
Fig. 13: Schematic illustration of the different thalli formed by members of the Order - Chytriales
Continuation • Monocentric thalli may be without rhizoids and holocarpic (entire thallus function in reproduction) or eucarpic (thallus differentiated into reproductive and somatic parts) • The thallu produced by the Chytridiales may be uninucleate or multinucleate. • Some members cause disease of animals and economic crops e.g. Chytridiomycosis ( Batrachochytrium dendrobatidis ); Black wart disease ( Synchytrium endobiotum ), Damaged grass root ( Olpidium brassicae ) • During the life cycle, the sporangium formed may be operculate (apical lidded nipple or opening called papilla in a discharge tube) or inoperculate (without any opening) • The also form Apophysis apart from rhizoids.
Continuation • The chytridiales members reproduce asexually by means of zoospores formed by the continuous cleavage of the zoosporangium cytoplasm .
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