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The disturbance of small RNA pathways enhanced abscisic acid response and multiple stress responses in Arabidopsis

The disturbance of small RNA pathways enhanced abscisic acid response and multiple stress... ABSTRACT The phytohormone abscisic acid (ABA) regulates plant growth and development as well as stress tolerance. To gain more insights into ABA signalling, a population of chemical‐inducible activation‐tagged Arabidopsis mutants was screened on the basis of the ABA effect on the inhibition of seed germination. Two novel ABA supersensitive mutants ABA supersensitive during germination1 (absg1) and absg2 were characterized as alleles of Dicer‐like1 (DCL1) and HEN1, respectively, as microRNA biogenesis genes, and accordingly, these two mutants were renamed dcl1‐11 and hen1‐16. The dcl1‐11 mutant was an ABA hypersensitive mutant for seed germination and root growth. Reverse transcriptase polymerase chain reaction assays revealed that the expression of ABA‐ and stress‐responsive genes was increased in dcl1‐11, as compared with the wild type (WT). Furthermore, the germination assay showed that dcl1‐11 was also more sensitive to salt and osmotic stress. The hen1‐16 mutant also showed supersensitive to ABA during seed germination. Further analysis showed that, among the microRNA biogenesis genes, all the other mutants were not only enhanced in sensitivity to ABA, salt and osmotic stress, but also enhanced the expression of ABA‐responsive genes. In addition to the mutants in the microRNA biogenesis, the interruption of the production of crucial components of other small RNA pathways such as dcl2, dcl3 and dcl4 also caused ABA supersensitive during germination. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell & Environment Wiley

The disturbance of small RNA pathways enhanced abscisic acid response and multiple stress responses in Arabidopsis

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References (61)

Publisher
Wiley
Copyright
© 2008 The Authors
ISSN
0140-7791
eISSN
1365-3040
DOI
10.1111/j.1365-3040.2008.01786.x
pmid
18208512
Publisher site
See Article on Publisher Site

Abstract

ABSTRACT The phytohormone abscisic acid (ABA) regulates plant growth and development as well as stress tolerance. To gain more insights into ABA signalling, a population of chemical‐inducible activation‐tagged Arabidopsis mutants was screened on the basis of the ABA effect on the inhibition of seed germination. Two novel ABA supersensitive mutants ABA supersensitive during germination1 (absg1) and absg2 were characterized as alleles of Dicer‐like1 (DCL1) and HEN1, respectively, as microRNA biogenesis genes, and accordingly, these two mutants were renamed dcl1‐11 and hen1‐16. The dcl1‐11 mutant was an ABA hypersensitive mutant for seed germination and root growth. Reverse transcriptase polymerase chain reaction assays revealed that the expression of ABA‐ and stress‐responsive genes was increased in dcl1‐11, as compared with the wild type (WT). Furthermore, the germination assay showed that dcl1‐11 was also more sensitive to salt and osmotic stress. The hen1‐16 mutant also showed supersensitive to ABA during seed germination. Further analysis showed that, among the microRNA biogenesis genes, all the other mutants were not only enhanced in sensitivity to ABA, salt and osmotic stress, but also enhanced the expression of ABA‐responsive genes. In addition to the mutants in the microRNA biogenesis, the interruption of the production of crucial components of other small RNA pathways such as dcl2, dcl3 and dcl4 also caused ABA supersensitive during germination.

Journal

Plant Cell & EnvironmentWiley

Published: Apr 1, 2008

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