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Journal of Heredity Advance Access originally published online on April 3, 2007
Journal of Heredity 2007 98(3):258-266; doi:10.1093/jhered/esm007
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© The American Genetic Association. 2007. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

The Role of Induced Mutation in Conversion of Photoperiod Dependence in Cotton

Ibrokhim Y. Abdurakhmonov, Fakhriddin N. Kushanov, Fayzulla Djaniqulov, Zabardast T. Buriev, Alan E. Pepper, Nilufar Fayzieva, Gafurjon T. Mavlonov, Sukumar Saha, Jonnie N. Jenkins, and Abdusattor Abdukarimov

From the Laboratory of Genetic Engineering and Biotechnology, Institute of Genetics and Plant Experimental Biology, Academy of Sciences of Uzbekistan, Yuqori Yuz, Qibray Region Tashkent District, 702151 Uzbekistan (Abdurakhmonov, Kushanov, Djaniqulov, Buriev, Fayzieva, Mavlonov, and Abdukarimov); Department of Biology, Texas A&M University, College Station, TX 77843 (Pepper); and U.S. Department of Agriculture–Agricultural Research Service, Crop Science Research Laboratory, Genetics and Precision Agriculture, PO Box 5367, 8120 Highway 12 East, Mississippi State, MS 39762 (Saha and Jenkins)

Address correspondence to I. Y. Abdurakhmonov at the address above, or e-mail: ibrokhim_a{at}yahoo.com.

Wild cotton germplasm resources are largely underutilized because of photoperiod-dependent flowering of "exotic" cottons. The objectives of this work were to explore the genome-wide effect of induced mutation in photoperiod-converted induced cotton mutants, estimating the genetic change between mutant and wild-type cottons using simple sequence repeats (SSRs) as well as understand the pattern of SSR mutation in induced mutagenesis. Three groups of photoperiod-converted radiomutants (32P) including their wild-type parental lines, A- and D-genome diploids, and typically grown cotton cultivars were screened with 250 cotton SSR primer pairs. Forty SSRs revealed the same SSR mutation profile in, at least, 2 independent mutant lines that were different from the original wild types. Induced mutagenesis both increased and decreased the allele sizes of SSRs in mutants with the higher mutation rate in SSRs containing dinucleotide motifs. Genetic distance obtained based on 141 informative SSR alleles ranged from 0.09 to 0.60 in all studied cotton genotypes. Genetic distance within all photoperiod-converted induced mutants was in a 0.09–0.25 range. The genetic distance among photoperiod-converted mutants and their originals ranged from 0.28 to 0.50, revealing significant modification of mutants from their original wild types. Typical Gossypium hirsutum cultivar, Namangan-77, revealed mutational pattern similar to induced radiomutants in 40 mutated SSR loci, implying possible pressure to these SSR loci not only in radiomutagenesis but also during common breeding process. Outcomes of the research should be useful in understanding the photoperiod-related mutations, and markers might help in mapping photoperiodic flowering genes in cotton.

Corresponding Editor: J. Perry Gustafson

Received December 21, 2005
Accepted November 13, 2006


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