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Journal of Heredity Advance Access published online on July 9, 2007
Journal of Heredity, doi:10.1093/jhered/esm037
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© The American Genetic Association. 2007. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communication

Detection of a True Breeding Homeotic Gene Mutant Pps-1 with Partially Petaloid Sepals in Opium Poppy (Papaver somniferum L.) and Its Genetic Behavior

Om Prakash Dhawan, Mukesh Kumar Dubey, and Suman Preet Singh Khanuja

From the Division of Genetics and Plant Breeding, Central Institute of Medicinal and Aromatic Plants, P.O. CIMAP, Lucknow 226015, India (Dhawan and Dubey); and the Division of Genetic Resources and Biotechnology, Central Institute of Medicinal and Aromatic Plants, P.O. CIMAP, Lucknow 226015, India (Khanuja)

Address correspondence to O. P. Dhawan at the address above, or e-mail: opdhawan{at}hotmail.com.

A spontaneous true breeding homeotic gene mutant Pps-1 with distinct partial petaloid sepals was detected in the population of downy mildew (DM)–resistant elite accession I-14 during our studies for the identification of disease resistance sources in opium poppy. The trait was found to be stable and inherited truly in the subsequent generations. Genetic studies were carried out through systematic reciprocal crosses with the parental wild-type genotype I-14, and segregation pattern of phenotypic characteristics in F1 and F2 populations clearly indicated single recessive nuclear gene control of the mutant character. The studies have demonstrated that the mutant phenotype is due to mutations at the Pps-1 locus that possibly corresponds to B-class function (according to ABC model) with negative control function. The mutant Pps-1 being single-whorl homeotic mutant might greatly help in providing insight into mechanisms of flower development in opium poppy.

Corresponding Editor: Prem Jauhar

Received February 7, 2006
Accepted February 27, 2007


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