physiological responses of Allium sativum to elevated CO2
R. Das2, B.D. Narzary3, D.B. Phookan4, A.
Saikia4 and S. Alam4
Agricultural Research Station, Assam Agricultural University, Shilongani- 782
2Department of Crop
Physiology, Assam Agricultural University, Jorhat- 785 013, India
Horticulture, SCCA, Dhubri-783 376, India
Horticulture, Assam Agricultural University, Jorhat-785 013, India
*Corresponding Author Email : email@example.com
The present investigation was undertaken to study the response of some garlic
varieties of Allium sativum under different ambient and elevated CO2
and temperature conditions in order to investigate the physiological
responses under changing climatic condition.
Methodology: A two factorial CRD experiment was conducted for two
years with four varieties of Allium sativum (Ekfutia Assam, Assam
Local, Bhima Omkar and Bhima Purple) under four atmospheric regimes [T1=
Ambient CO2 and temperature; T2= Carbon dioxide
Temperature Gradient Tunnel-I (400 ppm CO2 + 2oC higher
than ambient); T3 = Carbon dioxide Temperature Gradient Tunnel-II
(550 ppm CO2 + 4oC higher than ambient); T4
= Carbon dioxide Temperature Gradient Tunnel-III (700 ppm CO2 + 6oC
higher than ambient)]. Major changes in physiological parameters of the
varieties were recorded in Carbon dioxide Temperature Gradient Tunnel-II as
compared to ambient condition. The rate of photosynthesis was measured on
fully expanded youngest leaves of each sample plant using a portable Infrared
The mean photosynthetic rate of all four varieties grown over two years was
13.43% higher in Carbon dioxide Temperature Gradient Tunnel-II over varieties
grown for two consecutive years under Ambient CO2 and temperature.
However, high CO2 concentration and temperature stress
significantly reduced the stomatal conductance approximately by 27.48%.
Interpretation: The results of this study gives a
comprehensive analysis of garlic varieties under four different climatic
conditions of CO2 and temperature and revealed that Ekfutia Assam
and Assam Local and garlic varieties Bhima Omkar and Bhima Purple were
promising varieties as they responded significantly to elevated CO2
and temperature regimes. This may provide some critical inputs for optimizing
the strategies in future farming and farming opportunities of this
commercially and medicinally important crop under changing climatic conditions.
Carbon-di-oxide, Garlic varieties, Photosynthesis, Stomatal conductance,
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