Key message PaFVE is low ambient temperature-inducible and acts as a systemic regulator in the early stage of floral development in Phalaenopsis. Abstract Phalaenopsis aphrodite: subsp. formosana, a native orchid species of Taiwan, is an economically important orna- mental crop that requires low ambient temperature for floral transition. Currently, limited genetic information about such orchid species hampers genetic manipulation for specific or improved floral traits, and the control of flowering time independ- ent of temperature regulation. In this study, the sequence of the full-length of Phalaenopsis flowering locus VE ( PaFVE) gene was determined. Spatial and temporal expression studies showed that mRNA transcripts of PaFVE were inducible by low ambient temperature, and high levels of expression occurred after spiking initiation and remained high throughout the early stage of floral development. Further investigation revealed that floral organ development was impeded in PaFVE-silenced P. aphrodite, but flowering time and floral organogenesis were not compromised. Analysis of the downstream flowering genes suggested that the delay in floral maturation is associated with a corresponding decrease in the expression of downstream flowering genes, PaSOC1, PaSOC1L and PaAGL24. The ectopic expression of PaFVE in Arabidopsis resulted in an acceler- ated flowering time, accompanied by an
Plant Cell Reports – Springer Journals
Published: Dec 21, 2017
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