Comparative analysis of fruit quality and microRNAs in a cultivated strawberry white-flesh mutant and its wild type
2016
Li, H. | Zhang, Z. | Dai, H. | Liu, Y. | Ma, Y. | Wu, D.
MicroRNAs (miRNAs) are a class of small, non-coding RNAs that play a critical role in plant metabolism, hormone regulation and stress responses, but limited information is available concerning their possible role in fruit development. In order to elucidate the function of miRNAs during strawberry fruit development, we analyzed the effect on fruit quality and expression of miRNA at the turning stage of strawberry cultivar 'Sachinoka' and its white-flesh mutant. The results showed that the content of anthocyanin in the flesh of the white-flesh mutant was only 24% that of the wild type, but total soluble sugar content of the white-flesh mutant was clearly higher than that of the wild type. The ester content in the white-flesh mutant fruit was higher than that in the wild type, and the contents of nerolidol and linalool in mutant fruit were 40.8 and 3.1 times that of the wild type. Additionally, deep sequencing of small RNAs identified nine miRNAs that showed significant differences in expression between the two fruit-flesh colors, the expression of miR399a showing the biggest change. The expression level of miR399 has a possible negative correlation with the content of sugars in strawberry fruits.
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