write briefly about the vavilovs plant introduction?
Answers
Answer:
The Russian scientist Nikolai Ivanovich Vavilov and his colleagues visited several countries and collected a large number of crop plants and their wild relatives. ... He stated that plants were not domesticated at random but it was a continuous process
Answer:
The centre of origin is a geographical area where the particular group of organisms
(either domesticated or wild) first originated on earth. Many people believed that
centres of origin are also centres of diversity. But, the centres of diversity may not
represent the centres of origin of crop plants. Although a few species may have
been originated separately at more than one place, but most species had their origin
at a certain place and then spread elsewhere. In other words, in the centre of origin
a crop is generally confined to one place, whereas the centre of diversity may be
found at more than one place. The exact location of origin of species is only a
matter of speculation based on indirect evidences.
The information on origin of crop plants is important in plant breeding to locate
wild relatives, related species and new genes. Knowledge of the origins of crop
plants is important to avoid genetic erosion, the loss of germplasm due to th e loss of
ecotypes and habitat.
The Russian scientist Nikolai Ivanovich Vavilov and his colleagues visited several
countries and collected a large number of crop plants and their wild relatives. They
used this collection in Russian breeding programme of developing improved
varieties. His deductions were based on evidences from morphology, anatomy,
cytology, genetics, plant geography and distribution.
He considered that great centres of origin were always located in lower mountains
and hills of tropical, sub-tropical regions. He also recognizes some secondary
centres of origin where two or more species crossed together. Secondary centres of
origin are the places where natural and artificial selection occurred on after another.
He stated that plants were not domesticated at random but it was a continuous
process.
Explanation:
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