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The habitat of the microorganisms directly on the surface of leaf is called phylloplane. The phylloplane serves as habitat of a large number of bacterial species, fungal hyphae and spores, and unicellular yeast cells. The presence of viral entities on the leaf surface also cannot be ruled out. The phylloplane fungi can produce the enzyme cellular. They are also known to produce enzymes pectinase, cutinases, and proteases. There are specially pigmented populations of yeasts and bacteria on the leaf surfaces. It is believed that pigments of microbial population afford protection against otherwise harmful UV radiations; and direct sunlight on the surface of the leaf.
The populations of phylloplane of pine trees bear the capability to utilize sugars and alcohol as carbon sources, in a better way than bacterial populations in the litter (leafy material and twigs left lying on the forest floor) layer. Bacterial populations in the phylloplane of rye are represented by Xanthomonads and pink chromogens in the month of may Xanthomonads and Pseudomonads in the month of July, Xanthomonads in September and listerial and staphylococci in the month of September. Populations of Alternaria, Epicoccus and Stremphylium have been seen as phylloplane invaders 9.

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