Author(s):

Adishesha K, Janagoudar BS and Amaregouda A

Abstract: Temperature and CO₂ are two of the main environmental factors associated with climate change. It is generally expected that elevated CO₂ will increase crop production. However, other environmental factors such as temperature along with management practices could further modify a crop’s response to CO₂. The goal of this study was to determine the interactive effects of elevated CO₂ and above optimum temperature on growth, development and yield of five maize(Zea mays L.) genotypes, e.g., HTMR-1, HTMR-2, ARJUN, 900M Gold, and NK 6240.Global climate change can affect yields of agricultural crops are likely to be affected due to rise in CO₂ and temperature, apart from other factors. In this context, the present study aimed at to assess the maize (Zea mays L.) genotypes to elevated carbon dioxide and temperature regimes. Series of climates were synthesized by increasing CO₂ levels from 390 to 550ppm with an increasing the temperature at 2⁰ C. A significant increase in chlorophyll content, reducing and non-reducing sugars was seen in elevated CO₂ treatment but soluble protein was decreased. Whereas, under elevated temperature regimes chlorophyll content, reducing and non-reducing sugars are decreased due to altered C: N ratio. The results indicated that on doubling the CO₂ level of the existing (350ppm) at existing temperature, a yield of grain in maize was increased. Unlike effect of CO₂, crop yields were decreased with increase in temperature.

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