Observation of the basic form and disease caused by the bacteria

I. Experimental purpose
the
fungus
" of the submens of the bacterium is called the fungus, is the most advanced class of fungi, characterized by sexual reproduction of the burden and spores, the spores are a kind of exogenetic spores.
Because most of the pyrethroids do not have obvious monolithic nutrition stage, so rarely see the birth spores reproduction, the strain bacteria have two types of mycelium, one is formed by the spore germination of the monolith, each cell has only one nucleus of the primary mycelium, the other is the formation of a pair of cell nuclei in each cell nucleus secondary mycelium, commonly the 3dys on the joint phenomenon is more common.
this experiment, we can grasp the morphological characteristics of the bacteria and the symptoms of the disease caused by the bacteria, and lay a preliminary foundation for the classification and identification of the diseases of the bacteria.
II, content, materials and methods
According to whether the strain bacteria form a burden fruit, as well as whether the burden fruit is a naked fruit type or fruit type and other characteristics, the sage bacteria submens are divided into teliomycotes, Hymenomycetes and gasteromycetes three outlines. Among them, the parasiticity is strong, and plant diseases are closely related to the winter spores of the purpose of the rusty black powder bacteria, winter spores are generally considered to be low-class strain bacteria, no burden fruit, the formation of scattered or piles of winter spores.(i) Rusty bacteria
Rust is characterized by the formation of winter spores from the top cells of bi-nuclear mycelium, the burden (upper or back burden) is from the exogenetic type of winter spores (lower burden or primary burden) germination, the burden produces three more horizontal divided into four cells, each cell produces one The life history of a spore, rust bacteria can produce several morphological and cytological characteristics of different spores, and there is a transfer parasitic phenomenon, rust bacteria according to the winter spores have a handle or no handle divided into two sections: handleless layer rust bacteria (Melampsoraceae) and handle rusty bacteria (Pucciniaceae). Rust bacteria are specialized parasitic.1. Melampsoraceae (Melampsoraceae)
(1) Gate Rust Genus (No handle Rust belongs to Melampsora)
Winter spores without handle, single cells, side dense into a neat single layer, more born under the surface, take the M.lini specimen observation symptoms, and mirror the linut rust bacteria preparation, pay attention to the above morphological characteristics.
(2) layer rust genus (Phakopsora)
winter spores without handle, single cells, each other up and down the side of each other secretly formed a multi-layer, cushion-like, buried under the host skin, take the P.ziziphi-vulgaris specimen observation symptoms will point, and mirror the bacteria preparation 225, pay attention to the above-mentioned morphological characteristics, and the difference with no handle rust.2. Pucciniaceae (Pucciniaceae)
(1) monocytobacteria genus (Uromyces)
winter spores have handles, single cells, thick top wall, break through the main skin born outside the body, take vegetable bean rust (U.appendiculatus) disease leaves and disease specimens to observe the size, color of summer spore pile and winter spore pile, whether to wear the surface skin? Using anatomical needles to pick out the winter spores on the sick leaves for lens examination, pay attention to the morphological characteristics of the rust.
(2) shank rust genus (double rust genus Puccinia)
winter spores have short shanks, double cells, wall thickness, non-glued water, take wheat straw rust (P.graminis), leaf rust (P.recondita) and strip rust (P.s) rriiformis) specimens, pay attention to observe the characteristics of symptoms, compare the three rust occurrence sites, summer spore pile and winter spore pile size, shape, color, arrangement and cracking conditions, etc. are different, and then use anatomy needle to pick out the wheat straw rust bacteria winter spore pile production lens examination, pay attention to the fungus above the morphological characteristics.
(3) Gymnosporangium
Winter spores have long shanks, double cells, thin walls, hydrogelization, take samples of G. yamadai and G. Haraeanum, observe symptoms, pay special attention to the symptoms on the host cypress tree, which spores occur on cypress trees? Does the bacteria have a summer spore stage? Take apple rust bacteria preparation tablets or pear rust bacteria winter spore preparation tablets 231, pay attention to the above characteristics of the genus.
(4) Polycytosporosis genus (Phragmidium)
winter spores single- born, with a long handle, large and significant, the lower part of the handle puffed, 3 to more cells, wall-swimming spore whip thick, smooth surface or tumor-like protrusion, observation of P. rosamultiflorae specimen, mirror its preparation, attention to the above characteristics.