MicroRNAs (miRNAs), as an important growth regulator, are also involved in gibberellic acid (GA) signaling, revealing much relationship between miRNAs and GA in various plant responses. Grape is highly sensitive to GA3, which plays a significant regulatory role in regulation of flower development, berry expansion, berry set, berry ripening, and seedlessness induction; further, it was found that grapevine miR061 (VvmiR061) is a GA3 responsive miRNA. In this study, grapevine REV (VvREV) and HOX32 (VvHOX32), two target genes of VvmiR061, were predicted, verified, and cloned; homologous conservation was analyzed in various plants. The expression profiles of both VvmiR061 and its target genes (VvREV and VvHOX32) under GA3 treatment were detected by qRT-PCR during grapevine flower and berry development. Results revealed that GA3 treatment has upregulated the transcription of VvREV and VvHOX32, while it downregulated the expression of VvmiR061. The function of VvmiR061 in cleaving target genes VvREV and VvHOX32 was diminished by GA3 treatment during flower developmental process. The results of this study exhibited the importance of VvmiR061 in regulating flower development and GA3 signaling pathway and also contributed some to the knowledge of small RNA-mediated regulation in grape.
Functional & Integrative Genomics – Springer Journals
Published: Feb 28, 2017
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