Table 2.

Stress and Defense Gene Transcript Levels^a

Geneb	EST Stock/ Accession No.	Air		Ozone
		Col-0	rcd1	Col-0	rcd1
PR1	M90508	0.1c	0.1	2.0⇑d	2.3⇑
CHIb	92G1T7	0.1	0.1	0.2	0.2
GST1	206N21T7	0.4	0.4	5.0⇑	11⇑
GST2	91H22T7	0.6	0.5	6.5⇑	13⇑
AT-ACO2	G2B6T7	0.3	0.5	0.6	1.6↑
MNSOD1	109J19T7	1.6	2.3	2.0	1.6
Cu/ZnSOD1	2G11T7P	2.5	3.3	3.0	4.2
Cu/ZnSOD2	161I22T7	4.5	5.1	2.6	1.6
FeSOD1	34D9T7	1.0	2.2	0.4	0.2
APX1	135D24T7	1.9	2.2	1.7	2.7
GR	185P3T7	1.1	1.7	0.3	0.8
GPX2	190H7T7	2.0	2.2	0.7	1.9
catalase3	134I1T7	5.3	2.2	12↑	10⇑
catalase1	118M15T7	0.3	0.3	2.2⇑	1.0↑
AOS	230J8T7	0.8	0.6	0.5	0.3
PDF1.2	37F10T7	1.3	0.4	1.5	0.5

^aExpression of selected stress- and defense-related genes in wild-type Col-0 and the rcd1 mutant in ambient air and at 8 hr after the beginning of a 6-hr O₃ exposure (250 nL L⁻¹). A complete list of the genes used can be seen at http://www.biocenter.helsinki.fi/bi/koivu/Arabidopsis/arrays.html.

^bPR, pathogenesis-related protein; CHIb, basic chitinase; GST, glutathione S-transferase; ACO, ACC oxidase; SOD, superoxide dismutase; APX, ascorbate peroxidase; GR, glutathione reductase; GPX, glutathione peroxidase; AOS, allene oxide synthase; PDF, plant defensin.

^cThe values depict mRNA abundance relative to the mean of mRNA abundance of actin genes ACT2 (EST accession number 179M16T7) and ACT8 (accession number 179P1T7), which were shown to be constitutively expressed by RNA gel blots.

^d↑, induction two- to fourfold; ⇑, induction fivefold and above. Similar results have been seen using mRNA from three independent experiments.