Mohsen Zavareh1, Gerrit Hoogenboom2, Hamid Rahimian Mashhadi3, and Reza Tavakkol Afshari3. (1) The Univ of Guilan, Dept. of Agronomy and Plant Breeding, College of Agricultural Sciences, Rasht, Iran, (2) Univ of Georgia, Dept of Biological and Agricultural Engineering, 1109 Experiment St, Griffin, GA 30223, (3) Univ of Tehran, Dept. of Agronomy and Plant Breeding, Faculty of Agriculture, Karaj, Iran
The effect of temperature and elevated CO2 on the leaf growth and development of sesame (Sesamum indicum L) was studied. Seeds of three different genotypes of sesame were grown in controlled-environment chambers of the Georgia Envirotron at the Griffin Campus of the University of Georgia. The plants were exposed to six different environmental treatments that included three day/night temperature combinations, i.e., 33/21, 35.5/23.5, and 38/26ºC, and two CO2 concentrations, i.e., 400 and 700 ppm. Nine growth analysis samples were collected 15 day-intervals during the growing season. To record the developmental events including the vegetative and reproductive stages, observations were taken daily. Individual plant height, the number of nodes on the main stem, total leaf area per plant, the number of branches, and the length of the individual internodes were also recorded. Specific leaf area (SLA), leaf area duration (LAD), and average leaf size were calculated during the growing cycle. There was a significant effect of temperature on most all of the growth traits, while the effect of CO2 was less dominant. There was also a significant difference between the responses of the three genotypes.
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