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Arbuscular mycorrhizas (AMs) have the ability to enhance drought tolerance of citrus, but the underlying mechanisms have not been clearly elucidated. Considering the strong association of cell membrane fatty acid (FA) unsaturation with plant drought tolerance, the present study hypothesized that AM fungi (AMF) modulated the composition and unsaturation of FAs to enhance drought tolerance of host plants. Drought-sensitive citrus rootstocks, trifoliate orange (Poncirus trifoliata) seedlings, were inoculated with AMF (Funneliformis mosseae) for 3 months and were subsequently exposed to drought stress (DS) for 8 weeks. Mycorrhizal seedlings exhibited better plant growth performance, higher leaf water potential and lower root abscisic acid concentrations under both well-watered (WW) and DS conditions. Arbuscular mycorrhiza fungus inoculation considerably increased root methyl oleate (C18:1), methyl linoleate (C18:2) and methyl linolenate (C18:3N3) concentrations under both WW and DS conditions, and root methyl palmitoleate (C16:1) concentrations under WW, while it decreased root methyl stearate (C18:0) levels under both WW and DS. These changes in the composition of FAs of mycorrhized roots resulted in higher unsaturation index of root FAs, which later aided in reducing the oxidative damage on account of lower concentration of malondialdehyde and superoxide radicals. The changes of these FAs were a result of AMF-up-regulating root FA desaturase 2 (PtFAD2), FA desaturase 6 (PtFAD6) and Δ9 FA desaturase (PtΔ9) genes under WW and PtFAD2, PtFAD6 and Δ15 FA desaturase (PtΔ15) genes under DS conditions. Our results confirmed that mycorrhization brought significant changes in root FA compositions, in addition to regulation of gene expression responsible for increasing the unsaturation level of FAs, a predisposing physiological event for better drought tolerance of citrus.

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Background: The mental health and well-being have been severely impacted by the COVID-19 crisis. People are distressed due to the immediate impacts as well as the consequences of physical isolation, which could have lasting effect on overall well-being. The study aimed to assess the psychological effect of the pandemic on the general population of India using COVID-19 specific scales.Method: An online, cross-sectional study was conducted from 20th June 2020 to 4th July 2020 on persons of both sexes and aged 18 years or more. A convenient sampling method was used for recruiting participants. An online Google form was designed and distributed using social media platforms. The psychological effect of the pandemic was assessed using validated scales of coronavirus anxiety scale, obsession with COVID-19 scale, and fear of COVID-19 scale respectively.Result: The study received responses from 2004 participants from 31 states and union territories of India. The overall prevalence of psychological disorder due to COVID-19 was 53.3% (n=1068). The prevalence of anxiety was found to be 3.29% (n=66), obsession 13.47% (270) and fear 46.9% (1045). Around 2.8% (55) of the participants suffered from all three psychological disorders. Pearson correlation test showed a significant positive correlation between all the three psychological morbidities.Conclusions: The study findings showed high prevalence of mental health problems among Indian population during the COVID-19 outbreak with a positive correlation between them.

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