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Ethylene response factor  ( ERF ) genes have been characterized in numerous plants in which they are involved in responses to biotic and abiotic stress, including cold and heat stress. Cool temperatures is one of the most effective storage methods for delaying browning of fresh-cut lotus ( Nelumbo nucifera ) root. In model plants,  ERF  genes have been identified as being responsive to cold and heat stress. Whether  ERF  is associated with lotus root browning in cooler temperatures has not been studied. In this research, low-temperature storage (4 °C) effectively delayed browning of fresh-cut lotus root. Using RNA sequencing, seven  Nelumbo nucifera ERF  ( NnERF ) genes were isolated and studied. Transcriptional analysis indicated  NnERF  genes responded differently to temperature.  NnERF3/4/5  were reduced continuously by a low temperature (4 °C) and  NnERF5  was the most strongly downregulated. In contrast, transcripts of  NnERF1/2/7  were increased at a low temperature (4 °C). The expression of  NnERF6  showed no obvious difference between the two different temperatures. It is proposed that  NnERF3/4/5  could be important candidates as regulators of fresh-cut lotus root browning. The roles of other members are also discussed.

Expression of Ethylene Response Factor Genes during Fresh-cut Lotus Root Storage and Browning