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۱Impact of Elevated Atmospheric CO2 Concentration on Growth and Yield of Potato Cultivars
اطلاعات انتشار: World Applied Sciences Journal، بيست و چهارم،شماره۴، ۲۰۱۳، سال
تعداد صفحات: ۷
Concentration of CO2 in the atmosphere is likely to increase up to 550 μmol mol by the middle of 1 21st century. Such an increase in the atmospheric CO may effect plant growth and productivity of crop plants. 2 A field experiment was conducted with two potato cultivars namely Kufri Surya and Kufri Chipsona–3 grown inside Open Top Chambers (OTCs) at ambient (385±30 μmol mol 1) and elevated CO 570±50 μmol mol 1), 2 during rabi season of the year 2009–2010. The experiment was planned in a randomized complete block design under factorial arrangement with three replications. The photosynthetic rate significantly increased in both the cultivars under high CO2 and enhancement was greater in K. Chipsona–3 than K. Surya. There was increased accumulation of reducing, non–reducing and total sugars in the leaves of both the cultivars due to CO2 enrichment. Crop growth rate (CGR) and tuber growth rate (TGR) in both cultivars was higher in plants grown under elevated CO2 compared with ambient. High CO2 increased more partitioning of dry matter towards the tubers at all harvesting stages. Potato plants grown under elevated CO2 exhibited increased tuber yield due to enhanced number of tubers per plant. At the final harvest, total tuber fresh weight was 36% greater under high CO2 treatments compared to ambient. Among the two cultivars the response of K. Chipsona–3 was better to increased CO2concentration compared with K. Surya. The study concludes that rising atmospheric CO2 in future climate change scenario may be beneficial for tuber crops like potato to enhance growth as well as tuber yield.
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