Effect of Ascophyllum nodosum (Phaeophyta) extract on the productivity, performance, and transport stress response on propagules of the commercially important red alga Kappaphycus alvarezii
2025
Digvijay Singh Yadav | Arti Bhojani | Jigar A. Sutariya | Ashutosh Kaushik | Bhagirath Rakhasiya | Jasmine V. Rajai | Bhavik Kantilal Bhagiya | P. Gwen Grace | Mujeer Habsi | Santlal Jaiswar | Harshad R. Brahmbhatt | V. Veeragurunathan | Mangal Singh Rathore | Vaibhav A. Mantri
Abstract Seaweed cultivation is globally recognized for its commercial, pharmaceutical, and nutritional benefits. Transporting propagules from seed banks to coastal areas is vital for expanding seaweed farming. The purpose of the current study is to investigate the metabolic response and quality assessment of Kappaphycus alvarezii propagules during long-distance transport after treatment with the phaeophyte Ascophyllum Extract Powder (AE), followed by out-planting. The present results indicate that transportation impaired photosynthetic capacity of Kappaphycus alvarezii, with reductions in net primary productivity and respiration rate of 46.1 and 27%, respectively below the control. Chlorophyll-a, R-phycoerythrin (R-PE), and R-phycocyanin (R-PC) contents dropped at least by 73% in average post transport. Further, the transportation-induced oxidative stress increased membrane instability and reduced antioxidant capacity by 25%; meanwhile the accumulation of sodium and magnesium indicates an osmotic stress. Metabolic changes included a rise in osmoprotectants (glycerol, glyceryl-glycosides, myo-inositol, and scyllo-inositol), depletion of structural sugars (arabino-furanose and D-mannose), and rise in metabolic derivatives due to desiccation stress during the long-distance transport. The AE-treatment followed by out-planting did not mitigate transport-induced stress effectively. The study would aid investigations on mechanisms of desiccation tolerance in formulation of effective transportation practices to enhance quality seed material and improve the commercial seaweed farming towards uplifting the livelihoods of coastal communities.
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