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Generative cell–specific activation of the histone gH2A gene promoter of Lilium longiflorum in tobacco

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Abstract

The Lilium longiflorum gH2A promoter is active exclusively in the generative cells of mature pollen in transgenic tobacco expressing the gH2A promoter::GUS (β-glucuronidase) construct as a reporter gene. Temporal and spatial aspects of gH2A promoter activity examined during pollen development in transgenic tobacco reveal that GUS reporter activity was not detected until developing pollen entered the early bicellular developmental stage. Activity was first detected in generative cells at early-mid stages and gradually increased to maximum levels at mid-bicellular stages. The patterns of appearance and longevity of GUS activity in tobacco were very similar to those of gH2A mRNA during pollen development in Lilium. Exogenous treatment with colchicine, a well-known microtubule depolymerize, blocked microspore mitosis and inhibited generative cell differentiation. No GUS signal was detected in the resulting anomalous pollen, which lacked generative cell differentiation. These data strongly suggest that normal generative cell development is essential for activation of the gH2A promoter. Furthermore, these results indicate that common transcriptional activator(s) of the gH2A promoter may be present in both Lilium and Nicotiana, and that such putative factor(s) activates the gH2A promoter only when generative cells undergo normal development.

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Acknowledgments

We would like to thank K. Toyosawa for excellent technical assistance.

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The authors declare that they have no conflicts of interest.

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Correspondence to Kenji Ueda.

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Communicated by David Twell.

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Ueda, K., Ono, M., Iwashita, J. et al. Generative cell–specific activation of the histone gH2A gene promoter of Lilium longiflorum in tobacco. Sex Plant Reprod 25, 247–255 (2012). https://doi.org/10.1007/s00497-012-0194-3

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