Abstract
Key message
Petunia PhGRL1 suppression accelerated flower senescence and increased the expression of the genes downstream of ethylene signaling, whereas PhGR suppression did not.
Abstract
Ethylene plays an important role in flowers senescence. Homologous proteins Green-Ripe and Reversion to Ethylene sensitivity1 are positive regulators of ethylene responses in tomato and Arabidopsis, respectively. The petunia flower has served as a model for the study of ethylene response during senescence. In this study, petunia PhGR and PhGRL1 expression was analyzed in different organs, throughout floral senescence, and after exogenous ethylene treatment; and the roles of PhGR and PhGRL1 during petunia flower senescence were investigated. PhGRL1 suppression mediated by virus-induced gene silencing accelerated flower senescence and increased ethylene production; however, the suppression of PhGR did not. Taken together, these data suggest that PhGRL1 is involved in negative regulation of flower senescence, possibly via ethylene production inhibition and consequently reduced ethylene signaling activation.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (31270736, 31170653, and 31470700).
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The authors declare that they have no conflict of interest.
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Communicated by M. C. Jordan.
W. Yang and J. Liu contributed equally to this work.
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Yang, W., Liu, J., Tan, Y. et al. Functional characterization of PhGR and PhGRL1 during flower senescence in the petunia. Plant Cell Rep 34, 1561–1568 (2015). https://doi.org/10.1007/s00299-015-1808-7
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DOI: https://doi.org/10.1007/s00299-015-1808-7