پیامد افزایش غلظت دی اکسیدکربن هوا بر برخی ویژگیهای چهار ژنوتیپ برنج در سطوح مختلف نیتروژن

Abstract
This study aimed to investigate the growth and development of four rice genotypes (Shirodi, Fajr, Tarom Mantaghe, Hosseni) at four levels of nitrogen (0.712, 1.42, 2.85, 3.79 mM of ammonium nitrate in the Yoshida nutrient solution) and at two levels of ambient (360±50 µM) and enriched (700±50 µM) carbon dioxide. The experiment was arranged as factorial in a randomized complete block design with four replications in research greenhouse of Isfahan University of Technology during autumn and winter in 2013. The results showed that there was different among rice genotypes to response of air CO2 enrichment and nitrogen levels. Rising concentrations of carbon dioxide had a significant effect on green leaf surface, SPAD index and total chlorophyll a and b. at the 0.05 probability levels, respectively. Under 700 µM carbon dioxide, dry weight biomass of Shirudi (35 %), Fajr (4.5 %) and Hassani (12.8 %) was increased, while in Tarom Mantaghe (22 %). was reduced. Generally, the genetic diversity of growth characteristics that observed in different levels of nitrogen and carbon dioxide could be used for improving breeding programs and to management of agroecosystems that affected by climate change.