Indian Society of Genetics & Plant Breeding
Inheritance of testa colour was studied in six cros~ of groundnut namely Tin,lpati - 1
(rose) x ICCV 86699 (red), JL-24 (rose) x ICCV 86699 (red), TCGS-37 (red) x ICCV
86699 (red), Tirupati - 1 (rose) x NcAc 343 (rose), JL-24 (rose) x NeAc 343 (rose) and
TCCS-37 (red) x NcAc 343 (rose) and TCGS-37 (red) x NcAc 343 (rose). F2 segregation
gave an acceptable fit to a phenotypic ratio of 12 rose : 3 red: 1 light tan in fonner
two crosses which shows epistatic interaction between two loci. In the cross, TCGS-37
(red) x ICGV 86699 (red), F2 segregation fitted well to an expected phenotypic ratio
of 51 red: 12 rose : 1 light fan. This indicates the involvement of two gene loci for
red testa interacting with rose testa colour locus in epistatic fashion. F2 segregation
ratios in crosses Tirupati-1 (rose) x NcAc 343 (rose) and JL-24 (rose) x NeAc 343
(rose) fitted well to an expected phenotypic ratio of 60 rose: 3 red: 1 white indicating
trigenic inheritance with two epistatic gene loci governing rose testa interacting
with one red test acolour locus that is hypostatic to both the rose testa loci. The
segregation pattern in cross TCGS-37 (red) x NeAc 343 (rose) showed tetragenic
inheritance with duplicate loci for rose as well as red testa colours interacting in
epistatic manner. This needs to be confinned further through F3 studies.
Keywords: Testa colour, inheritance, epistatic interactions
Year: 1998
Volume: 58
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
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