To which group does PPLD belong to? Give their features.

Dear student,

The correct term is PPLO which is an acronym for Pleuro-Pneumonia Like Organisms.
It is referred to the mycoplasma. It is responsible for causing Pleuropneumonia of cattle, thus its name PPLO.
Classification: 

• Kingdom: Bacteria
• Phylum: Firmicutes
• Class: Mollicutes
• Order: Mycoplasmatales
• Family: Mycoplasmataceae
• Genus: Mycoplasma

Features of PPLO are:

• They are aerobic, prokaryotic and unicellular.
• They are extremely minute organisms with 0.3-0.9 micrometers of diameter.
• The cell is devoid of cell wall therefore it is found in variety of irregular shapes- ring like, pear shaped, etc.
• Genetic material is composed of both RNA and DNA but RNA's composition is more.
• They are usually non-motile.
• They reproduce vegetatively by binary fission or budding.
• They are classified into three types:

1. Mycoplasma: requires cholesterol for growth and are found in plants, animals.
2. Acholeplasma: does not require cholesterol and are found in sewage water.
3. Thermoplasma: does not require cholesterol and are found in hot springs.

• They are responsible for causing several diseases:

1. Plants: Strip disease in sugarcane
2. Animals: Pleuropneumonia of cattle
3. Humans: Infertility in man and inflammation of genetalia.

Hope this answer will clear your doubts about the topic.
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