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J Plant Physiol. 2009 Aug 15;166(12):1307-13. doi: 10.1016/j.jplph.2009.02.005. Epub 2009 Mar 23.

A gene encoding SMALL ACIDIC PROTEIN 2 potentially mediates the response to synthetic auxin, 2,4-dichlorophenoxyacetic acid, in Arabidopsis thaliana.

Author information

1
Radiation-Applied Biology Division, Japan Atomic Energy Agency, Takasaki 370-1292, Japan.

Abstract

The SMALL ACIDIC PROTEIN 2 (SMAP2) gene is a paralogue of the SMAP1 gene that mediates the response to the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) in the root of Arabidopsis thaliana. Their encoded proteins, SMAP1 and SMAP2, are similar in calculated molecular weight and isoelectric point, and in having a highly conserved phenylalanine and aspartic acid-rich domain. RNA expression analysis showed that SMAP1 mRNA is present throughout the plant body while SMAP2 mRNA is restricted to siliques and anthers. Over-expression of the SMAP2 gene, as well as SMAP1, by 35S cauliflower mosaic virus promoter restored sensitivity to 2,4-D in the 2,4-D-resistant mutant, aar1, which is defective in SMAP1 function. The results suggest that SMAP2 has an ability to mediate the 2,4-D response and is expressed only in restricted tissues.

PMID:
19307045
DOI:
10.1016/j.jplph.2009.02.005
[Indexed for MEDLINE]

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