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Published on: January 26, 2011
Simple sequence repeat marker associated with a natural leaf defoliation trait in tetraploid cotton
I Y Abdurakhmonov1, A A Abdullaev, S Saha
1Laboratory 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. ibrokhim_a@yahoo.com
The Journal of Heredity
|September 15, 2005
Summary
Researchers identified microsatellite markers linked to natural leaf defoliation in cotton. JESPR-178 shows strong association, potentially aiding marker-assisted selection for improved fiber production.
Area of Science:
- Plant genetics and breeding
- Agricultural science
Background:
- Natural leaf defoliation in cotton (Gossypium hirsutum L.) impacts production costs and fiber quality.
- Utilizing natural leaf defoliation traits from wild diploid cotton species offers economic and quality advantages for cultivated tetraploid cotton.
Purpose of the Study:
- To identify and tag loci associated with natural leaf defoliation using microsatellite markers in Upland cotton.
- To evaluate the heritability and genetic basis of the early leaf defoliation trait.
Main Methods:
- Developed F2 populations from reciprocal crosses between late (AN-Boyovut-2) and early (Listopad Beliy) leaf defoliating cotton lines.
- Employed Kruskal-Wallis (KW) nonparametric test to analyze Simple Sequence Repeat (SSR) marker associations with the leaf defoliation phenotype.
- Assigned significant markers to chromosomal locations.
Main Results:
- The naturally early leaf defoliation trait exhibited high heritability (0.74-0.84) with a minor cytoplasmic effect.
- Microsatellite markers JESPR-13, JESPR-153, and JESPR-178 were significantly associated with natural leaf defoliation (P < .05-.0001).
- JESPR-178 showed the strongest association (P < .0001) and was mapped to chromosome 18's short arm.
Conclusions:
- Microsatellite markers, particularly JESPR-178, are valuable tools for tagging natural leaf defoliation loci in cotton.
- These findings support the potential use of marker-assisted selection (MAS) to introgress desirable leaf defoliation QTLs into commercial cotton varieties.
- This research contributes to developing cost-effective, high-grade fiber production through genetic improvement of cotton.
