Abstract
Small RNAs are a group of non-coding RNAs that downregulate gene expression in a sequence-specific manner to control plant growth and development. The objective of the present study was to clone and characterize several small RNAs in cotton. To identify small RNAs that are involved in the development of cotton bolls and fibers, we generated cDNA libraries from cotton bolls at 13 days post-anthesis from two cotton cultivars, Pima Phy 76 (Gossypium bardadense) and Acala 1517–99 (Gossypium hirsutum). Screening of these libraries identified eight small RNAs, seven of which have not been reported in other plant species and appear to be absent in the known sequences of other plant species. Their predicted target genes are known to be involved in cotton fiber development. The cloned small RNAs displayed lower and differential expression in the examined boll developmental stages using RT-PCR and quantitative RT-PCR. The genetic polymorphism of the small RNAs at the DNA level was evaluated by miRNA-amplified fragment length polymorphism (AFLP) analysis using primers designed from the small miRNA genes in combination with AFLP primers. Homologous small RNA gene sequences were further isolated using this homology-based genotyping approach, and potential hairpin structures were identified. The results represent a novel method to isolate small including miRNA genes at the RNA and DNA levels in many plant species where genome sequences are not available or expressed sequence tags are limited.
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Acknowledgement
We thank Mr. Rio Stamler for helping in conducting quantitative PCR. This research was supported in part by grants from Cotton Incorporated, Cary, N.C., USA and the New Mexico Agricultural Experiment Station, NM, USA.
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Pang, M., Hanson, S.F. & Zhang, J. Cloning and Expression Studies of Novel Small RNAs in Tetraploid Cotton. Plant Mol Biol Rep 30, 710–718 (2012). https://doi.org/10.1007/s11105-011-0379-1
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DOI: https://doi.org/10.1007/s11105-011-0379-1