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

OAR@ICRISAT

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Relation http://oar.icrisat.org/3417/
http://dx.doi.org/10.3146/i0095-3679-11-1-6
 
Title Utilization of Wild Relatives in Genetic Improvement of Arachis hypogaea L. VI. Fertility in Triploids: Cytological Basis and Breeding Implications
 
Creator Singh, A K
Moss, J P
 
Subject Genetics and Genomics
 
Description 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.
 
Date 1984
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/3417/1/JA_329.pdf
Singh, A K and Moss, J P (1984) Utilization of Wild Relatives in Genetic Improvement of Arachis hypogaea L. VI. Fertility in Triploids: Cytological Basis and Breeding Implications. Peanut Science, 11 (1). pp. 17-21.