Microcyclus ulei

This is the fungus that causes South American Leaf Blight (SALB) of Para rubber. It is of interest in that rubber grows in the Amazon valley, which is permanently warm and wet, and it has a gene-for-gene relationship in spite of apparently having a continuous pathosystem. In fact, the rubber tree is deciduous, in spite of its continuously warm and wet tropical environment, and this demonstrates the evolutionary value of the deciduous habit in producing a discontinuous pathosystem for the control of parasites. Micro-evolution

Evolution within species . Unlike macro-evolution, microevolution operates during periods of historical time, it produces changes that are not intrinsically new, it produces no increase in complexity, it is reversible, it produces new ecotypes, and it does not produce new genetic code.

Micro-evolution in a wild ecosystem produces differing ecotypes as a result of different selection pressures in different parts of the ecosystem. It is the result of natural selection. Micro-evolution in an agro-ecosystem system produces differing agro-ecotypes as a result of different selection pressures in parts of the agro-ecosystem. It is the result of an artificial selection called domestication, or plant or animal breeding.

The classic example of micro-evolution was industrial melanism. Micro-organism

Any organism that is microscopic or ultra-microscopic (i.e., viruses, which are too small to be visible with a light microscope, and can be seen only with an electron microscope). Most plant pathogens are microscopic, but most plant pests are macroscopic.

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