Progressive Mutations Induced in Gossypium hirsutum by Radiations

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Abstract
Progressive mutations, produced by x-ray treatment of dry seeds, consisted of: (1) A mutation from forked-leaf to normal-leaf shape, induced in (a) an F1 which was heterozygous, Nn, and (b) a homozygous forked-leaf line, nn; (2) a mutation from virescent yellow leaf and plant color to normal green leaf and plant color. The mutation rate in each case was less than 1%. Evidence is also presented for reversible mutations in cotton. There are indications that a mutation has been induced from normal leaf to forked, the reverse of the mutation from forked to normal. The induced mutation from virescent yellow to green is the reversal of the mutation from green to virescent yellow which had previously occurred in nature.

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