Further studies on genetics of nonnodulation in peanut

Dutta, M and Reddy, L J (1988) Further studies on genetics of nonnodulation in peanut. Crop Science, 28 (1). pp. 60-62.

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In the peanut (Arachis hypogaea L.) nonnodulation has been reported to be controlled by both duplicate recessive genes and a single recessive gene. In the present study genetics of peanut nonnodulation was investigated in four crosses from data on F2 populations and F3 progenies from nonnodulating F2 plants. The F2 data of all the four crosses studied showed a better fit for a trigenic ratio of 61 nodulating to three nonnodulating plants compared to the previously reported duplicate digenic ratio of 15 nodulating to one nonnodulating F, plants. Further, the segregation of F2 progenies from nonnodulating F2 plants indicated the inadequacy of the duplicate factor model. A new genetic model involving three genes in the inheritance of nonnodulation is proposed. Two genes produce nodulation while the third gene inhibits nodulation only when it is dominant and the former two genes are in recessive homozygous condition. By assuming differential heterozygosity at the three loci of the parents involved in various crosses, the duplicate factor and monogenic ratios reported by previous workers on nonnodulation could be explained by the new model. Although the occurrence or non-occurrence of nodules is governed by a few major genes, the intensity of nodulation appears to be controlled quantitatively.

Item Type: Article
Subjects: Mandate crops > Groundnut
Depositing User: Mr Charan Sai Ch
Date Deposited: 06 Nov 2011 02:57
Last Modified: 06 Nov 2011 02:57
URI: http://oar.icrisat.org/id/eprint/3703
Official URL: http://dx.doi.org/10.2135/cropsci1988.0011183X0028...
Acknowledgement: UNSPECIFIED
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