Plant material and growing conditions.
Tomato plants (Solanum lycopersicum var. Rhinelands Rhune) were grown from seed in glasshouse facilities at the University of Tasmania, Australia. Plants experienced average day/night temperatures of 23/15 °C, an 18-hour photoperiod to ensure flowering, a relative humidity of approximately 40%, and were watered to field capacity daily to avoid drought stress. Seeds were germinated in punnets of fine pasteurised soil and then transferred to 2-l pots filled with potting mix (medium 7:4 mix of composted fine pine bark and coarse washed river sand). Plants were around 3 months old at commencement of experiments.