• The pipy flower ofPharbitis Nil as a mutable character

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    • Abstract


      1. The pipy flower, which ahs a small tubular corolla, appeared spontaneously by mutation in anF2 pedigree. The character is due to a recessive gene, which is automutable, frequently changing into normal.

      2. The pipy plant produces about 2·9 per cent. of mutated, normal gametes, resulting in 5·9 per cent. heterozygous normal individuals. The lability of pipy causes a marked deficit in the pipy segregates in the heterozygous pedigrees. In addition to this, pipy plants exhibit vegetative mutation to normal, becoming themselves mosaic. The occurrence of mosaics in the pipy plants reaches 17·2 per cent. Vegetative mutation occurs also in the heterozygous normal sporophytes, bearing normal flowers in otherwise heterozygous crinkled flowers.

      3. Bud-variation on the pipy stock appears in three forms, namely, crinkled normal, enlarged pipy, and less-enlarged pipy. The crinkled normal sport has either mutated, normal ecto- and meso-histogens or all normal tissues, the enlarged pipy has normal meso-histogen, and the less-enlarged pipy normal ecto-histogen, the last two at least being periclinal chimeras with heterogeneous tissues.

      In concluding this paper we wish to express our thanks to the Foundation for the Promotion of Scientific and Industrial Research of Japan for the grant from which the expenses incurred in connection with the present investigation were partly defrayed.

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  • Journal of Genetics | News

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