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Expression patterns of conserved microRNAs in the male gametophyte of loblolly pine (Pinus taeda)

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Abstract

MicroRNAs (miRNAs) are small RNAs that regulate genes involved in various aspects of plant development, but their presence and expression patterns in the male gametophytes of gymnosperms have not yet been established. Therefore, this study identified and compared the expression patterns of conserved miRNAs from two stages of the male gametophyte of loblolly pine (Pinus taeda), which are the mature (ungerminated) and germinated pollen. Microarray was used to identify conserved miRNAs that varied in expression between these two stages of the loblolly pine male gametophyte. Forty-seven conserved miRNAs showed significantly different expression levels between mature and germinated loblolly pine pollen. In particular, miRNAs representing 14 and 8 families were up- and down-regulated in germinated loblolly pine pollen, respectively. qRT-PCR was used to validate their expression patterns using representative miRNAs. Target genes and proteins were identified using psRNATarget program. Predicted targets of the 22 miRNA families belong mostly to classes of genes involved in defense/stress response, metabolism, regulation, and signaling. qRT-PCR was also used to validate the expression patterns of representative target genes. This study shows that conserved miRNAs are expressed in mature and germinated loblolly pine pollen. Many of these miRNAs are differentially expressed, which indicates that the two stages of the male gametophyte examined are regulated at the miRNA level. This study also expands our knowledge of the male gametophytes of seed plants by providing insights on some similarities and differences in the types and expression patterns of conserved miRNAs between loblolly pine with those of rice and Arabidopsis.

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Authors and Affiliations

  1. Department of Environmental and Forest Biology, State University of New York College of Environmental Science and Forestry, One Forestry Drive, Syracuse, NY, 13210, USA

    Christina R. Quinn, Rie Iriyama & Danilo D. Fernando

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  1. Christina R. Quinn
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  2. Rie Iriyama
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  3. Danilo D. Fernando
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Correspondence to Danilo D. Fernando.

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Communicated by Venkatesan Sundaresan.

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Quinn, C.R., Iriyama, R. & Fernando, D.D. Expression patterns of conserved microRNAs in the male gametophyte of loblolly pine (Pinus taeda). Plant Reprod 27, 69–78 (2014). https://doi.org/10.1007/s00497-014-0241-3

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  • DOI: https://doi.org/10.1007/s00497-014-0241-3

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