FIGURE LEGENDS
Figure 1: The effect of high CO2 on the growth of wild type peas and mutants defective either in strigolactone (SL) synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ) for 7 days either under ambient (400 ppm CO2; top row) or high (750 ppm CO2; bottom row).
Figure 2: The effect of high CO2 on the stem height and branching of the shoots of wild type peas and mutants defective either in strigolactone (SL) synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ) grown for 7 days either under ambient (400 ppm CO2) or high (750 ppm CO2).
Figure 3: The effect of high CO2 on the stem height and branching of the shoots of wild type peas and mutants defective either in strigolactone (SL) synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ) grown for 14 days either under ambient (400 ppm CO2) or high (750 ppm CO2).
Figure 4: The effect of high CO2 on the fresh weight (A ), dry weight (B ) and plant water content (C ) of wild type peas and mutants defective either in strigolactone (SL) synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ) grown for 28 days either under ambient (400 ppm CO2) or high (750 ppm CO2).
Figure 5: The effect of high CO2 on the growth of wild type peas and mutants defective either in strigolactone (SL) synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ). Plants were grown for 28 days either under ambient (400 ppm CO2; bottom row) or high (750 ppm CO2; top row).
Figure 6: The effect of high CO2 on stem height (A ), shoot branching (B ) in wild type peas and mutants defective either in strigolactone (SL) synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ) grown for 32 days either under ambient (400 ppm CO2) or high (750 ppm CO2).
Figure 7: The effect of high CO2 on the dry weight of wild type peas and mutants defective either in strigolactone (SL) synthesis SL synthesis (rms1 -2, rms5-3 ) or signalling (rms3 -1 and rms4-1 ) grown for 32 days either under ambient (400 ppm CO2) or high (750 ppm CO2).
Figure 8: The effect of high CO2 on aphid fecundity on wild type peas and mutants defective in strigolactone (SL) signalling (rms3 -1 and rms4-1 ). A single pea aphid nymph was placed on each 5-day old plant. Plants were then grown in air or under high [CO2]. Aphid numbers per plant were determined 15 days later. Ten replicates were performed for each SL mutant and wild type under each [CO2] per experiment.
Figure 9: The effect of high CO2 and of aphid infestation on the phytohormone levels of wild type peas and mutants defective in strigolactone signalling (rms3 -1 andrms4-1 ).
Figure 10: A linear regression analysis of the relationship between the number of aphids on each plant and the gibberellic content of the plant. Of the variability in aphid fecundity, 18% can be explained by the gibberellic acid concentrations measured (P = 0.0181).