Physiological Plasticity of Green Gram Stomata to Photosynthesis Traits under Interactive Effects of Elevated CO2, Drought and Heat Stress

J. Ranjani Priya

Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, India.

D. Vijayalakshmi *

Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, India.

A. Vinitha

Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, India.

M. Raveendran

Department of Biotechnology, Tamil Nadu Agricultural University, Coimbatore, India.

V. Babu Rajendra Prasad

Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, India.

*Author to whom correspondence should be addressed.


Abstract

Heat waves and droughts are projected to become more widespread as a result of climate change. At the same time, CO2 levels are predicted to have doubled by 2100. The stomatal regulation and gas exchange characteristics were assessed in 25 days old plants of green gram (var Co 8) by exposing them to six different treatments namely, T1: a [CO2] + a T+ irrigation (100%), T2: a [CO2] + a T+ irrigation (50%), T3: a [CO2] + e T (40ºC) + irrigation (100%), T4: e [CO2] – 800 ppm + a T+ irrigation (100%), T5: a [CO2] + combined stress [e T (40ºC) + irrigation (50%) T6: e [CO2] – 800 ppm + combined stress [e T (40ºC) + irrigation (50%)]. The experiment was carried out using Completely Randomized Design (CRD) with three replications. All gas exchange parameters viz., ((photosynthesis rate, stomatal conductance, and transpiration rate) were determined before imposing stress and two weeks after imposing stress. Stomatal characters was examined two weeks after imposing stress. Elevated CO2 stress caused a reduction in stomatal frequency accompanied by larger stomatal size. The study revealed the positive effect of higher CO2 concentration on gas exchange traits of the C3 crops viz., green gram.

Keywords: Green gram, elevated CO2, drought, heat, photosynthetic rate, stomatal frequency, stomatal area


How to Cite

Priya, J. Ranjani, D. Vijayalakshmi, A. Vinitha, M. Raveendran, and V. Babu Rajendra Prasad. 2021. “Physiological Plasticity of Green Gram Stomata to Photosynthesis Traits under Interactive Effects of Elevated CO2, Drought and Heat Stress”. International Journal of Environment and Climate Change 11 (10):109-19. https://doi.org/10.9734/ijecc/2021/v11i1030498.