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To investigate the molecular mechanism underlying fruit development and color change, comparative transcriptome analysis was employed to generate transcriptome profiles of two typical wild varieties of  Fragaria pentaphylla  at three fruit developmental stages (green fruit stage, turning stage, and ripe fruit stage). We identified 25,699 long noncoding RNAs (lncRNAs) derived from 25,107 loci in the  F. pentaphylla  fruit transcriptome, which showed distinct stage- and genotype-specific expression patterns. Time course analysis detected a large number of differentially expressed protein-coding genes and lncRNAs associated with fruit development and ripening in both of the  F. pentaphylla  varieties. The target genes downregulated in the late stages were enriched in terms of photosynthesis and cell wall organization or biogenesis, suggesting that lncRNAs may act as negative regulators to suppress photosynthesis and cell wall organization or biogenesis during fruit development and ripening of  F. pentaphylla . Pairwise comparisons of two varieties at three developmental stages identified 365 differentially expressed lncRNAs in total. Functional annotation of target genes suggested that lncRNAs in  F. pentaphylla  may play roles in fruit color formation by regulating the expression of structural genes or regulatory factors. Construction of the regulatory network further revealed that the low expression of  Fra a  and  CHS  may be the main cause of colorless fruit in  F. pentaphylla .

horticulture research

Comparative transcriptome analysis uncovers the regulatory functions of long noncoding RNAs in fruit development and color changes of Fragaria pentaphylla