Abstract
AbstractPlants of ‘Bluebonnet,’ ‘Caloro,’ ‘Dokri,’ and ‘Kangni’ cultivars were grown for 2, 4, 6 and 8 weeks in growth cabinets using temperatures of 35/18, 35/26.5, 35/35 and 40.5/18 C day/night and photoperiods of 8, 10, 12 and 14 hours.The rate of net CO2 assimilation on a leaf blade weight basis was highest at 2 weeks in all varieties at all temperatures and photoperiods and declined with age. The greatest decline at 8 weeks compared to 2 weeks was 71% in Dokri and least was 65% in Bluebonnet. The assimilation rate was consistently higher in plants grown in 8‐hour photoperiod. Compared to 14‐hour, the rate at 8‐hour was higher by 28 and 25% at 6 and 8 weeks, respectively. In most cases, the highest assimilation rates were recorded at 40.5/18 and 35/35 C. Both Bluebonnet and Caloro had higher assimilation rates than Dokri and Kangni.
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