Learn about the comparison between the three rusts of wheat. Comparison # Black Rust (P. Graminis): i. Stems are most seriously attacked, followed by leaf sheaths, leaves and 'ears', in decreasing order. First noticed in plains in March-April. ii. Uredosori rust-red, large and elongated which coalesce to form continuous pustules. The overlying epidermis breaks irregularly. iii. Uredospores oval with four [...]
There is a single class, Oomycetes, which is further divided into 7 orders. We shall study some genera belonging to the orders Saprolegniales, Pythiales and Peronosporales. Order Saprolegniales (Water Molds): The term 'water molds' is generally used for genera belonging to this order. The zoospores are formed in zoosporangia. A peculiar feature of this order is the production of two [...]
In this article we will discuss about reproduction of fungi in phylum oomycetes. Reproduction in Saprolegnia: Asexual Reproduction: It is accomplished by zoospores. Cylindrical zoosporangia develop at the tips of hyphae which produce numerous biflagellate zoospores. When mature, they can be seen jostling one another within the zoosporangium. The apex of the zoosporangium suddenly breaks releasing the zoospores. At first, [...]