Vol. 5, Issue 5 (2017)
Response of maize (Zea mays L.) genotypes to elevated carbon dioxide and temperature regimes
Author(s): Adishesha K, Janagoudar BS and Amaregouda A
Abstract: As per recent IPCC (2013) assessment report global scale climate change has occurred and it will be continued in near future at different rates. Due to climate change globle atmospheric carbon dioxide concentration (CO2) are rising and projected to reach between 540 and 970 ppm by the end of 21st century and globle surface temperature may increase 1.4- 5.8° C in association with this doubling of CO2. Crop species (both C3 as well as C4) are directly affected by elevated levels of temperature and CO2 due to changes in plant physical structures, leaf chemistry and carbon: nitrogen balance etc. which in turn affect yield, tolerance to drought stress and susceptibility to pests and herbivores. An investigation was carried out to study the response of maize genotypes to elevated carbon dioxide and temperature regimes under Open Top Chamber (OTC’s) at University of Agricultural Sciences, Raichur, Karnataka during summer and kharif season 2014-15. Various morphological parameters studied indicated that, the genotypes HTMR-1, 900M-GOLD and HTMR-2 performed better under elevated CO2 and temperature regime. The maximum reduction with respect to these parameters was observed in ARJUN and NK 6240 genotypes. The exposure of the crop elevated CO2 and temperature regime resulted in the significant decrease in the photosynthetic rates. The minimum reduction was observed in HTMR-1, HTMR-2 and NK 6240 and the maximum in ARJUN and 900M-GOLD. The results indicated that on doubling the CO2 level of the existing (350 ppm) at existing temperature, a yield of grain in maize was increased. Unlike effect of CO2, crop yields were decreased with increase in temperature.
Pages: 2448-2456 | 855 Views 68 Downloads
How to cite this article:
Adishesha K, Janagoudar BS, Amaregouda A. Response of maize (Zea mays L.) genotypes to elevated carbon dioxide and temperature regimes. Int J Chem Stud 2017;5(5):2448-2456.