Abstract
Four different ferritin genes have been identified in Arabidopsis thaliana, namely AtFer1, 2, 3 and 4. AtFer1, which strongly accumulates in leaves treated with excess iron, contains in its promoter an Iron-Dependent Regulatory Sequence (IDRS). The IDRS sequence is responsible for repression of AtFer1 transcription under conditions of low iron supply. Arabidopsis plants transformed with a 1,400-bp AtFer1 promoter, with either a wild-type or a mutated IDRS fused to the β-glucuronidase (GUS) reporter gene, enabled us to analyze the activity of the AtFer1 promoter in different tissues as well as during age-dependent or dark-induced senescence. Our results show that IDRS mediates AtFer1 expression during dark-induced senescence while it does not affect AtFer1 expression during age-dependent senescence or in young seedlings. Photoinhibition promoted either by high light or chilling temperature, or wounding, does not activate the AtFer1 promoter. In contrast, AtFer2, AtFer3, AtFer4 transcript abundances are increased in response to photoinhibition and AtFer3 transcript abundance is increased upon wounding. Taken together, our results indicate that other cis-elements, different from the IDRS, regulate the territory-specific or developmental expression of AtFer1 gene. Expression of this gene appears insensitive to some of the environmental stresses tested, which instead up-regulate other members of the Arabidopsis ferritin gene family.
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Abbreviations
- At1400IDRS line:
-
Arabidopsis line transformed with a construct containing the wild-type AtFer1 1,400-bp promoter upstream of the GUS reporter gene
- At1400m*IDRS line:
-
Arabidopsis line transformed with a construct containing the AtFer1 1,400-bp promoter with the mutated IDRS sequence
- F 0 :
-
initial fluorescence of dark-adapted leaves
- F m :
-
maximal fluorescence of dark-adapted leaves
- F v :
-
variable fluorescence (F m−F 0) of dark-adapted leaves
- GUS:
-
β-glucuronidase
- JA:
-
jasmonic acid
- IDRS:
-
iron dependent regulatory sequence
- RT–PCR:
-
reverse transcription–polymerase chain reaction
- WT:
-
wild type
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Acknowledgements
This work was supported by MURST 2000 in the framework of the program "Nitric oxide and plant resistance to pathogens" and by the Centre National de la Recherche Scientifique (France).
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Tarantino, D., Petit, JM., Lobreaux, S. et al. Differential involvement of the IDRS cis-element in the developmental and environmental regulation of the AtFer1 ferritin gene from Arabidopsis . Planta 217, 709–716 (2003). https://doi.org/10.1007/s00425-003-1038-z
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DOI: https://doi.org/10.1007/s00425-003-1038-z