Abstract:
BACKGROUND:'Fengzao' is an early-ripening bud mutant of 'Kyoho', which matures nearly 30 days earlier than 'Kyoho'. To gain a better understanding of the regulatory role of miRNAs in early-ripening of grape berry, high-throughput sequencing approach and quantitative RT-PCR validation were employed to identify miRNAs at the genome-wide level and profile the expression patterns of the miRNAs during berry development in 'Kyho' and 'Fengzao', respectively. RESULTS:Nine independent small RNA libraries were constructed and sequenced in two varieties from key berry development stages. A total of 108 known miRNAs and 61 novel miRNAs were identified. Among that, 159 miRNAs identified in 'Fengzao' all completely expressed in 'Kyoho' and there were 10 miRNAs specifically expressed in 'Kyoho'. The expression profiles of known and novel miRNAs were quite similar between two varieties. As the major differentially expressed miRNAs, novel_144, vvi-miR3626-3p and vvi-miR3626-5p only expressed in 'Kyoho', vvi-miR399b and vvi-miR399e were down-regulated in 'Fengzao', while vvi-miR477b-3p up-regulated in 'Fengzao'. According to the expression analysis and previous reports, miR169-NF-Y subunit, miR398-CSD, miR3626-RNA helicase, miR399- phosphate transporter and miR477-GRAS transcription factor were selected as the candidates for further investigations of miRNA regulation role in the early-ripening of grape. The qRT-PCR analyses validated the contrasting expression patterns for these miRNAs and their target genes. CONCLUSIONS:The miRNAome of the grape berry development of 'Kyoho', and its early-ripening bud mutant, 'Fengzao' were compared by high-throughput sequencing. The expression pattern of several key miRNAs and their target genes during grape berry development and ripening stages was examined. Our results provide valuable basis towards understanding the regulatory mechanisms of early-ripening of grape berry.
journal_name
BMC Plant Bioljournal_title
BMC plant biologyauthors
Guo DL,Li Q,Lv WQ,Zhang GH,Yu YHdoi
10.1186/s12870-018-1516-xsubject
Has Abstractpub_date
2018-11-16 00:00:00pages
285issue
1issn
1471-2229pii
10.1186/s12870-018-1516-xjournal_volume
18pub_type
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