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Diurnal ACC levels from sorghum grown under a 12-h/12-h photoperiod, 31°C/22°C thermoperiod until 8 am of d 6, then in constant light at 27°C. The first sample was from 5-d-old plants (58M is phyB-1, 100M is PHYB); n = 4, means ± se. White and black bars indicate light/warm and dark/cool periods, respectively. FW, Fresh weight.
