Journal
PLANT SIGNALING & BEHAVIOR
Volume 8, Issue 3, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.23414
Keywords
putative-transcription factor; phosphate transporter; root architecture; symbiosis
Categories
Funding
- Converging technologies-BIOBIT [CIPE2007]
- National project PRIN
- Piedmont Region
- University of Torino
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The arbuscular mycorrhizal-induced LjMAMI gene is phylogenetically related to GARP transcription factors involved in Pi-starvation responses such as AtPHR1. The gene is strongly upregulated in arbusculated cells from mycorrhizal plants and in root meristems, irrespectively of the fungal presence. A further expression analysis revealed a similar expression pattern for LjPT4, considered a marker gene for mycorrhizal functionality. Here we show that the LjPT4 promoter contains two conserved cis-acting elements typically found in Pi-starvation induced Pi transporters. One of these is strongly related to the binding site of AtPHR1, suggesting a direct regulation of LjPT4 by LjMAMI. The expression of both genes in non-mycorrhizal tissues leads to the hypothesis that these symbiosis-inducible genes are also involved in Pi starvation responses in root meristems in an AM-independent manner.
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