西亚试剂：Kiwifruit EIL and ERF genes involved in regulating fruit ri

Kiwifruit EIL and ERF genes involved in regulating fruit ripening
Xue-ren Yin1, Andrew C. Allan2, Kun-song Chen1,3 and Ian B. Ferguson2

1 Zhejiang University; , 2 New Zealand Institute for Plant and Food Research Limited

Kiwifruit (Actinidia deliciosa) is a climacteric fruit sensitive to low concentrations of ethylene. To investigate the transcriptional mechanisms underlying kiwifruit ethylene response, transcription factors encoding four EIN3-Like (EILs) and fourteen ethylene response factors (ERFs) were cloned from kiwifruit. Expression of these transcription factors was examined during fruit development. The expression of transcripts of most AdERFs was higher during early fruit development, with the exception of AdERF3 which increased with maturity. Several AdERFs were apparently downregulated by ethylene as they were affected by the ethylene inhibitor 1-methylcyclopropene and by antisense suppression of ACO in the fruit. In contrast, AdEILs were constitutively expressed during fruit development and ripening. The transcription factors AdEIL2 and AdEIL3 activated transcription of the ripening-related genes AdACO1 and AdXET5 and, when over-expressed in Arabidopsis, stimulated ethylene production. The potential repressor AdERF9 suppressed this promoter activity. These results support a role for kiwifruit EILs and ERFs in transcriptional regulation of ripening related genes and in the regulation of kiwifruit fruit ripening processes.

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