Antioxidative changes in Citrus reticulata L. induced by drought stress and its effect on root colonization by arbuscular mycorrhizal fungi
Journal Title: European Journal of Biological Research - Year 2016, Vol 6, Issue 1
Abstract
The objective of the study is to understand drought induced oxidative stress scavenging mechanism in Citrus reticulata in order to understand the interplay between different biochemical components and antioxidants within plant tissue and its effect on arbuscular mycorrhizal fungal diversity and spore density. For this, citrus plants were subjected to water stress by avoiding watering plants for different time periods. Different biochemical and physiological parameters were measured following water stress. Biochemical components such as total sugar and total soluble protein increased along with decline in relative water content and total chlorophyll content during water stress. Accumulation of foliar non enzymatic antioxidants such as carotenoid and ascorbic acid as well as proline were found to be gradually enhanced under water stress. There were significant changes in the activities of antioxidative enzymes such as peroxidase, ascorbate peroxidase, glutathione reductase, catalase, and superoxide dismutase. The stress signals like hydrogen peroxide and malonaldehyde increased under water deficit condition as a response to oxidative damage promoted by lipid peroxidation under elevated free radical formation. Besides, percentage root colonization by arbuscular mycorrhizal fungi and number of spores increased markedly under prolonged drought. The results suggested that plant can withstand drought induced oxidative stress up to certain period, manifested by elevated level of non enzymatic antioxidant content and upregulation of antioxidative enzymes. Increased AMF colonization might also have some role in protecting the plants from drought induced oxidative injury.
Authors and Affiliations
Jayanwita Sarkar, Asit Ray, Bishwanath Chakraborty, Usha Chakraborty
Keywords
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