Photo 1. Photo 2. Blisters of cabbage white rust, Albugo candida , on the outer leaves of Chinese cabbage especially top right and bottom left. Photo 3.
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You can change your ad preferences anytime. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Rajbir Singh , Associate Professor Follow. Published in: Education. Full Name Comment goes here. Are you sure you want to Yes No. Thank You Lecturer Singh.
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But it is rare. Its protoplasm is divided in Periplasm and Ooplasm. At the point of contact of Oogonium cell wall become thin and form papilla. The cleistothecia are large enough to be visible to be naked eye as black dots on the infected host surface. It causes ergot disease. The fungus attacks only the inflorescence of its host. Grains are replaced by blunt trilateral horn-shaped black sclerotia known by the name of ergots.
In the mature state they are composed of a dirty-white medullary tissue surrounded by a violet- brown rind. The medulla or the central core consists of a prosenchyma formed of looser cylindric prismatic cells of pale-brown colour which are about one to four times as long as breadth. These ascospores disseminate by air to stigma of flower and like pollen tube reach to ovary of flower and resulting in Honey Dew formation.
Conidia are infective. Life Cycle of Claviceps sp. Which cause macrocyclic and heteroecious rust in wheat. In this stage uredia are form from branched, septate, intracellular and dikaryotic mycelium. Spermogonium Life cycle of Puccinia You just clipped your first slide!
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Aecidium candidum Pers. Gray Cystopus candidus Pers. Albugo candida commonly known as white rust , is a species of oomycete in the family Albuginaceae. It is sometimes called a fungus, but in fact forms part of a distinct lineage of fungus-like microorganisms, Oomycetes, commonly known as water moulds. It has not been recorded from northern Scandinavia, northern and central Siberia, northern China, western and central Africa, Alaska, northern and central Canada, and southern and western South America. This pathogen infects plants in the family Brassicaceae ; the growth stages involved include the seedling stage, the growing stage, the flowering stage, and the fruiting stage.
Albugo is an obligate parasite on a number of flowering plants. It is represented by 25 species. The vegetative pant body is composed of non-septate coenocytic hyphae that grow in the inter-cellular spaces of the host. They penetrate the cells of the host and absorb food material from it. The asexual reproduction takes place by means of biflagellate zoospores formed inside the sporangia. In the very beginning the hyphae accumulate just beneath the epidermis of the infected leaf.