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This biography of M. S. Swaminathan combines elements of a textbook based on his original contributions to cytogenetics of crops and their improvement using radiation and chemical mutagenesis, and his notable transition as a crusader of a hunger- free world. In the early chapters, it traces Swaminathan’s landing in Wageningen, the Netherlands in 1949 and the beginning of his tryst with cytogenetics of potato successively in Wageningen, Cambridge (England) and Wisconsin (USA). Potato was a tough and even unsuitable plant for in-depth cytogenetic research and improvement by breeding across the ploidal levels. The cultivated potato is a tetraploid (2n – 4x = 48), whereas species having the genes to shield against nematodes and frost are diploids (2n = 2x = 24).
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