Abstract
We have isolated the LLA23 gene in the pollen of Lilium longiflorum. The LLA23 gene encodes an ASR (named after abscisic acid, stress and ripening) protein that has a nuclear localization sequence at the C terminus. The gene is interrupted by one single intron and possesses a long 5′-untranslated region. Southern blots of lily genomic DNA indicated that LLA23 is a member of a small gene family. We examined the link between LLA23 location and the desiccation that naturally occurs in developing anthers using immunogold labeling. When pollen reached maturity, a significant increase in LLA23 labeling was observed in the nuclei of both vegetative and generative cells from 10- to 12-cm buds and thereafter. This clearly demonstrates that a marked increase in LLA23 translocation from the cytoplasm to both nuclei of pollen grains occurs in 12-cm buds, a stage shortly before the commencement of desiccation during anther development. In addition, microarray analysis showed that 410 (206 up-regulated and 204 down-regulated) genes have altered expression in LLA23-overexpressing plants. Quantitative PCR analysis confirmed the changes in mRNA levels observed in our microarray analysis. This genome-wide overview of gene expression supports the theory that LLA23 acts as a regulator.
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Abbreviations
- ASR:
-
abscisic acid-, stress-, and ripening-induced
- LEA:
-
late embryogenesis abundant
- NLS:
-
nuclear localization signal
- PBS:
-
phosphate-buffered saline
- PBST:
-
PBS containing 0.05% Tween 20
- Q-PCR:
-
quantitative PCR
- TAIL-PCR:
-
thermal asymmetric interlaced PCR
- SDS-PAGE:
-
sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- SSC:
-
NaCl and sodium citrate
- UTR:
-
untranslated region
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Acknowledgment
We thank Y.-F. Hsu for his able technical assistance. This work was supported by the National Science Council grant NSC95-2311-B005-006-MY3 to Co-Shine Wang.
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The nucleotide sequence data of the LLA23 gene reported here will appear in the EMBL, GenBank and DDBJ Nucleotide Sequence Databases under the accession number EU652722.
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Yang, CY., Wu, CH., Jauh, G.Y. et al. The LLA23 protein translocates into nuclei shortly before desiccation in developing pollen grains and regulates gene expression in Arabidopsis. Protoplasma 233, 241–254 (2008). https://doi.org/10.1007/s00709-008-0016-5
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DOI: https://doi.org/10.1007/s00709-008-0016-5