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Effect of heat stress on growth, physiological and biochemical activities of wheat (Triticum aestivum L.)

Research Paper | October 1, 2017

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Noor Ahmad Khan, Safiullah Khan, Neelofar Naz, Mursaleen Shah, Irfanullah, Suhail Ahmad, Hazrat Sher, Atawullah Khan

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Int. J. Biosci.11( 4), 173-183, October 2017

DOI: http://dx.doi.org/10.12692/ijb/11.4.173-183


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Globalization and modern processes of industrialization and race for energy, food, economy and mainly technology producing havoc for living things in the environment. Such processes also increasing the temperature and heat of earth, which has a hazardous effect on different economic crop plants. Our focus was to investigate the effect of heat stress on wheat crop as it is the most important daily food part. The present investigations were carried out to determine the influence of different concentrations of heat stress on physiological, biochemical and growth parameters of wheat (Triticum aestivum L.). The heat stresses C- Control (25°C), T1- 45°C, T2- 40°C, T3- 35°C were applied in separate growth chambers to the plants after 24 days of their germination. The high temperature stress significantly reduced the chlorophyll a and chlorophyll b contents of wheat plants. High temperature stress reduced the growth of wheat and resulted in significant reduction in leaf relative water content, leaf fresh weight and leaf dry weight. Antioxidant enzymes such as Ascorbate peroxidase (APX), Peroxidase (POD) and Glutathione reductase (GR) also showed a significant increase in their activity under high temperature stress. However, CAT enzyme showed a significant reduction under higher concentration (T1- 45 °C) of heat stress, while CAT activity was significantly increased by moderately high temperature stress. Malondialdehyde (MDA) level was significantly increased by both the higher concentration (T1- 45 °C, T2- 40°C,) of heat. It showed that plants exposed to severe heat stress under goes enhanced lipid peroxidation as a result of which MDA level is increased in wheat plants, however low temperature stress did not show significant effect on MDA level.


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Effect of heat stress on growth, physiological and biochemical activities of wheat (Triticum aestivum L.)

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