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Effects of elevated CO2 on rice seedling establishment of MR219 and SRI Malaysia 1 varieties

Mohammad Sadiq Salihi

Rice (Oryza sativa L.) is one of the most important members of the Poaceae family as this crop has been the staple food for people in various nations, especially in Asian countries. Current climate changes and increasing carbon dioxide (CO2) concentration in the atmosphere have varying global impacts on crop performance. As CO2 is one of the limiting factors in photosynthesis, adding this gas can increase carboxylation activity, hence increasing productivity and yield. Thus, this research was conducted to study the effects of elevated CO2 (eCO2) on rice seedlings' growth and establishment for MR219 and Seri Malaysia1 varieties. The study used a novel approach where the rice plants were treated with high CO2 only during their early vegetative stage before being transplanted into the field. The source of CO2 for eCO2 condition was obtained from baker’s yeast fermentation which was 600 to 800 µmol mol-1. For the ambient CO2 (aCO2), it was 410 µmol mol-1 to 415 µmol mol-1 and control at field condition. Rice seedlings were grown in a nested design with 15 replications for four weeks in a growth chamber under Light-emitting diode (LED) lights (white, red, and blue). The seedlings in the control treatment were grown in the field. The results demonstrated that the leaf properties of rice seedlings, for instance, leaf length, leaf number per plant, and leaf area, were increased by 9.20%, 10.28%, and 25.67%, respectively, in eCO2 compared to control. Similarly, the general growth properties such as seedling length   and seedling dry weight were increased by 18.25 and 34.21% respectively, under eCO2 compared to control

To Cite this article: Salihi, M.S. 2024. Effects of elevated CO2 on rice seedling establishment of MR219 and SRI Malaysia 1 varieties. Pak. J. Bot., 56(3): DOI:  

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