Abstract
Environmental stress dramatically reduces plant reproduction. Previous results showed that placing roots in 200 mM NaCl for 12 h caused 90% of the developing Arabidopsis ovules to abort (Sun et al. in Plant Physiol 135:2358–2367, 2004). To discover the molecular responses that occur during ovule abortion, gene expression was monitored using Affymetrix 24k genome arrays. Transcript levels were measured in pistils that were stressed for 6, 12, 18, and 24 h, then compared with the levels in healthy pistils. Over the course of this experiment, a total of 535 salt-responsive genes were identified. Cluster analysis showed that differentially expressed genes exhibited reproducible changes in expression. The expression of 65 transcription factors, some of which are known to be involved in stress responses, were modulated during ovule abortion. In flowers, salt stress led to a 30-fold increase in Na+ ions and modest, but significant, decreases in the accumulation of other ions. The expression of cation exchangers and ion transporters were induced, presumably to reestablish ion homeostasis following salt stress. Genes that encode enzymes that detoxify reactive oxygen species (ROS), including ascorbate peroxidase and peroxidase, were downregulated after ovules committed to abort. These changes in gene expression coincided with the synthesis of ROS in female gametophytes. One day after salt stress, ROS spread from the gametophytes to the maternal chalaza and integuments. In addition, genes encoding proteins that regulate ethylene responses, including ethylene biosynthesis, ethylene signal transduction and ethylene-responsive transcription factors, were upregulated after stress. Hypotheses are proposed on the basis of this expression analysis, which will be evaluated further in future experiments.
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Abbreviations
- aRNA:
-
Antisense RNA
- CH2DCFDA:
-
5-(and −6)-carboxy-2′,7′-dichlorodihydro-fluorescein diacetate
- DChip:
-
DNA-chip analyzer
- DREB:
-
Dehydration-responsive element-binding
- ERF:
-
Ethylene response factor
- LCB:
-
Lower confidence bound
- MAS:
-
Affymetrix microarray suite
- PCD:
-
Programmed cell death
- ROS:
-
Reactive oxygen species
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Acknowledgments
The authors thank Mick Popp and others in the UF ICBR microarray facility for their attention to detail, which allowed us to collect an accurate, reproducible microarray hybridization data. In addition, we thank Michelle Mack and Jennie DeMarco for their assistance with elemental analysis. This research was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service (grant# 2002-35100-12109) and a UF Alumni Fellowship (Kelian Sun).
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Sun, K., Cui, Y. & Hauser, B.A. Environmental stress alters genes expression and induces ovule abortion: reactive oxygen species appear as ovules commit to abort. Planta 222, 632–642 (2005). https://doi.org/10.1007/s00425-005-0010-5
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DOI: https://doi.org/10.1007/s00425-005-0010-5