Abstract
A persistent limitation to molecular biological research on cotton (Gossypium spp.) has been the difficulty in isolation of total genomic DNA from the plant tissue. This report describes a reliable strategy for isolation of genomic DNA from cotton. The mini-preparation procedure involves use of lyophilized, etiolated cotyledons and an anion exchange column kit. The isolated DNA had a molecular weight in excess of 50 kb with minimal degradation or shearing. Routine yields ranged from 5 to 7 μg DNA per etiolated cotyledon pair (corresponding to 100 ng/mg dry weight), in contrast to little or no DNA from equivalent amounts of either green cotyledons or mature leaf tissue. The decreased yields from the latter tissues appeared to be correlated with increased afmounts of flavonoid. The DNA was amenable to routine molecular applications as demonstrated by: digestibility with a number of restriction enzymes (Eco RI,HindIII,Sau 3A), and hybridization of a tomato genomic clone containing the gene for S-adenosylmethionine synthetase to a 13.3-kbEco RI fragment of cotton. Using DNA from an isoline immune to root-knot nematodes, we observed no impediment to genomic cloning.
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Callahan, F.E., Mehta, A.M. Alternative approach for consistent yields of total genomic DNA from cotton (Gossypium hirsutum L.). Plant Mol Biol Rep 9, 252–261 (1991). https://doi.org/10.1007/BF02672075
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DOI: https://doi.org/10.1007/BF02672075