Work

Utilization of Wild Relatives in Genetic Improvement of Arachis hypogaea L. VI. Fertility in Triploids: Cytological Basis and Breeding Implications1

Year: 1984

Type: article

Abstract: The triploid hybrids between Arachis hypogaea L. and diploid species of section Arachis nom. nud. which had been observed to be sterile at Reading, England, produced pegs and pods at the ICRISAT Center. Cytological investigations of these and other triploid hybrids revealed (1) spindle abnormalities resulting in restitution nuclei and unreduced gametes, and (2) unequal segregation of chromosomes resulting in haploid to hyperdiploid gametes. Of the 225 F2 plants derived from triploids, 82% were hexaploid, 8% were tetraploid, and 10% had chromosome numbers from 20–59. This indicates that the above processes occurred both at micro- and mega-sporogenesis and that unreduced gametes were more effective in fertilization resulting in a higher percentage of hexaploid progenies. The implications of these results are that triploids can be used in Arachis interspecific breeding for increased recombination between chromosomes and quick recovery of Arachis hypogaea like tetraploid lines.

Source: Peanut Science

DOI: 10.3146/i0095-3679-11-1-6

Authors: A. K. Singh, J. P. Moss

Institutions: International Crops Research Institute for the Semi-Arid Tropics, International Crops Research Institute for the Semi-Arid Tropics

Language: English

Topic: Peanut Plant Research Studies

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: bronze

OpenAlex ID: W2148100751