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The Down-Regulation of Mt4-Like Genes by
Phosphate Fertilization Occurs Systemically and Involves Phosphate
Translocation to the Shoots1
Stephen H. Burleigh and
Maria J. Harrison*
The Samuel Roberts Noble Foundation, Plant Biology Division, 2510 Sam Noble Parkway, Ardmore, Oklahoma 73402
Mt4 is a cDNA representing a
phosphate-starvation-inducible gene from Medicago
truncatula that is down-regulated in roots in response to
inorganic phosphate (Pi) fertilization and colonization by arbuscular
mycorrhizal fungi. Split-root experiments revealed that the expression
of the Mt4 gene in M. truncatula roots is down-regulated systemically by both Pi fertilization and colonization by arbuscular mycorrhizal fungi. A comparison of Pi levels in these
tissues suggested that this systemic down-regulation is not caused by
Pi accumulation. Using a 30-bp region of the Mt4 gene as
a probe, Pi-starvation-inducible Mt4-like genes were
detected in Arabidopsis and soybean (Glycine max L.),
but not in corn (Zea mays L.). Analysis of the
expression of the Mt4-like Arabidopsis gene,
At4, in wild-type Arabidopsis and pho1, a
mutant unable to load Pi into the xylem, suggests that Pi must first be
translocated to the shoot for down-regulation to occur. The data from
the pho1 and split-root studies are consistent with the
presence of a translocatable shoot factor responsible for mediating the
systemic down-regulation of Mt4-like genes in roots.
1
This work was supported by The Samuel Roberts
Noble Foundation.
*
Corresponding author; e-mail mjharrison{at}noble.org; fax
1-580-221-7380.
Plant Physiol. (1999) 119: 241-248
Copyright Clearance Center: 0032-0889/99/119//08
© 1999 American Society of Plant Physiologists
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