Indian Society of Genetics & Plant Breeding


Polyploidy, chimera and fertility of interspecific cassava (Manihot escuJenta Crantz) hybrids

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Four interspecific hybrids between cassava and wild
Manlhot species were polyploidized by colchicine
application to buds of cuttings. Totally tetraploid types
as well as sectorial and periclinal chimeras were produced.
Somatic selection applied to lateral buds of sectorial
chimeras induced totally tetraploids. Fertility was restored
in the sterile interspecific hybrids by chromosome doubling
up to 93% viable pollen production in the tetraploids
compared to 13% In diploids, which could lead to the
evolution of new Manihot species. Periclinal chimeras
showed high vigour compared to both tetraploid and
diploid plants.

Keywords: Cassava, polyploidy, chimera, pollen viability, hybrid fertility


Year: 2004
Volume: 64
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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