Suppression of the auxin response pathway enhances susceptibility to Phytophthora cinnamomi while phosphite-mediated resistance stimulates the auxin signalling pathway

Table 1 Expression analysis of phosphate starvation response (PSR) genes in Arabidopsis thaliana ecotype Columbia (Col-0) grown under phosphate (Pi) sufficient (+Pi; 1.25 mM) and Pi deficient (−Pi; 0 mM) conditions and subjected to different phosphite (Phi) treatments

	Normalized relative transcript level						Relative fold difference to control
	+Pi			-Pi			+Pi		-Pi
Gene^a	0 mM Phi (control)	2.5 mM Phi	20 mM Phi	0 mM Phi	2.5 mM Phi	20 mM Phi	2.5 mM Phi	20 mM Phi	0 mM Phi	2.5 mM Phi	20 mM Phi
AT4	0.261_{± 0.005}	0.175 _{± 0.013}	0.306 _{± 0.033}	73.127_{± 4.331}	14.512 _{± 0.264}	0.290 _{± 0.026}	0.7	1.2	280.4	55.6	1.11
AtPT2	0.449 _{± 0.011}	0.662 _{± 0.112}	0.527 _{± 0.016}	12.537 _{± 0.70}	3.979 _{± 0.126}	0.499 _{± 0.082}	1.5	1.2	27.9	8.9	1.11
AtACP5	0.429 _{± 0.008}	0.560 _{± 0.032}	0.432 _{± 0.005}	8.354 _{± 0.434}	1.803 _{± 0.049}	0.459 _{± 0.007}	1.3	1.0	19.5	4.2	1.07

The transcript level of genes was normalized based on the expression of actin 2 (ACT2) measured in the same samples and presented as both normalized relative transcript level (mean ± SE) and the factor of increase in transcription compared with the control (+Pi/0 mM Phi). Data represent the mean and standard error of four biological replicates per treatment each consisting of three plants.
^aSee Table 2.

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