Durum Wheat Cultivars’ Antioxidant and Nitrate Assimilatory Enzyme Response to Bipolaris Sorokiniana Infection
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2017, Vol 7, Issue 4
Abstract
The biochemical responses of the foliar antioxidant and nitrate assimilatory enzymes to Bipolaris sorokiniana infection were studied in resistant (NIDW295 and PDW314) and susceptible (Bijaga Yellow and A-3-901) durum wheat cultivars. 30 day old durum wheat cultivars were inoculated with spore suspension (106 ml-1) of Bipolaris sorokiniana and the uninfected plants served as control. The activities of reactive oxygen species (ROS) scavenging enzymes namely superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) were strongly induced, while those of nitrate reductase and nitrite reductase were suppressed in inoculated leaves (48 hrs post inoculation) compared to healthy ones. The SOD, CAT and GR recorded maximum increase of 344%, 74% and 157% respectively in the resistant cultivars, suggesting their induction for detoxifying ROS synthesized during Bipolaris sorokiniana infection. The relatively lower activities of antioxidant enzymes in the susceptible cultivars make them more prone to oxidative injury than the resistant cultivars. The minimum decline in enzyme activities of nitrite and nitrate reductase in resistant cultivars (29.2% and 25.7% respectively) showed adequate nitrogen regulation, while the susceptible cultivars lacked the ability to maintain the nitrogen metabolism under infection. Thus, our study revealed significant differences in antioxidant enzyme and nitrate assimilatory activities between the Durum wheat cultivars, which may serve as a useful tool in selection of resistant cultivars.
Authors and Affiliations
Komal Mali, Kiran Kamalakar Mirajkar, Suma Biradar, Renuka Sudarshan Patil
Keywords
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