Abstract
ABSTRACTIn present study, the effects of combined Aluminium and Fluoride (AlF) stress on chlorophyll a fluorescence, photosynthetic pigments, antioxidant system and psb A gene expression are first time reported in four Brassica juncea cultivars (CS-14, Pusa-Tarak, Bio-902 and Laxmi). Each cultivar was exposed to soil supplemented with AlF (0, 50 + 25, 100 + 50 and 150 + 75 mgkg−1). Lowest decline in the chlorophyll content, saturating photosynthetically active photon flux density, maximum apparent electron transport rate and effective quantum yield (PSII) under AlF was observed in Pusa-Tarak followed by CS-14, Bio-902 and Laxmi. The improved performance of the cultivar Pusa-Tarak under AlF stress was accompanied by an increase in proline level and enzymes activity of catalase and ascorbate peroxidase. However, significant increase in superoxide dismutase activity was observed in cultivar Laxmi. We also observed that AlF inhibits psb A gene expression to a lesser extent in tolerant cultivar Pusa-Tarak in comparison to susceptible cultivar Laxmi.
Highlights
About half of the world’s agricultural soil is acidic (Divya Sri et al 2016; Gupta et al 2013)
The effects of combined Aluminium and Fluoride (AlF) stress on chlorophyll a fluorescence, photosynthetic pigments, antioxidant system and psb A gene expression are first time reported in four Brassica juncea cultivars (CS-14, Pusa-Tarak, Bio-902 and Laxmi)
Each cultivar showed a significant reduction in photosynthetic pigments at both the growth stages with respect to increase in AlF stress (ANOVA, p < 0.001)
Summary
About half of the world’s agricultural soil is acidic (Divya Sri et al 2016; Gupta et al 2013). It has been noticed that Al3+ has the highest binding affinity for F− in comparison to other 60 metal ions (Foster 2004). Owing to this affinity, Al and F form AlFx complex in acidic conditions. The accumulation of AlFx complex in plant affects many physiological, biochemical processes and molecular changes (H+-ATPase of root) (Rai et al 1996; Rocha-Fachna and Okorokova-Facanha 2002).The formation of AlF−4 , being a PO34− analogue, might compete with PO34− for binding sites of H+-ATPase and create starvation condition in plants (Alia 2004).Al and F together are one of the major problems in acidic soil globally
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
