Impact of sea-salt on morpho-physiological and biochemical responses in banana (Musa acuminata cv. Berangan)

Mazumdar, Purabi and Lau, Su Ee and Singh, Pooja and Takhtgahi, Hossein Mirzaei and Harikrishna, Jennifer Ann (2019) Impact of sea-salt on morpho-physiological and biochemical responses in banana (Musa acuminata cv. Berangan). Physiology and Molecular Biology of Plants, 25 (3). pp. 713-726. ISSN 0971-5894, DOI

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Banana is often grown in coastal-regions, and while known for its sensitivity towards seawater, little is documented on the effect of sea-salt on the growth, physiology and metal homeostasis. Here we report that banana plantlets exposed to sea-salt at extreme (average seawater concentration; 52.7 dS m−1), severe (28.5 dS m−1) or moderate (10.2 dS m−1) salinity levels had reduced root length (2.0–6.0-fold), plant height (1.2–1.6-fold), leaf number (2.0–2.3-fold) and leaf area (3.3–4.0-fold) compared to control plantlets. Degradation of pigments (total chlorophyll: 1.3–12.3-fold, chlorophyll a: 1.3–9.2-fold; chlorophyll b: 1.3–6.9-fold lower and carotenoids: 1.4–3.7-fold lower) reflected vulnerability of photosystems to salt stress. Relative water content showed a maximum decrease of 1.5-fold in salt stress. MDA analysis showed sea-salt exposure triggers 2.3–3.5-fold higher lipid peroxidation. Metal content analysis showed a 73-fold higher Na value from roots exposed to extreme salinity compared to control plantlets. While phenotype was clearly affected, moderate salinity showed no significant alteration of macro (N, P, K and Ca) and micro (Fe, Mn and Cu) metal content. The antioxidant enzymes: SOD (3.2-fold), CAT (1.7-fold) and GR (6-fold) showed higher activity at moderate salinity level compared to control plantlets but lower activity at severe (SOD: 1.3-fold; CAT: 1.5-fold; GR: 2-fold lower) and extreme seawater salinity (SOD: 1.5; CAT: 1.9; GR: 1.3-fold lower). Mild changes in growth and physiology at sea-salt levels equivalent to moderate seawater flooding, indicate that banana will survive such flooding, while extreme seawater inundation will be lethal. This data provides a reference for future salinity-mediated work in banana. © 2019, Prof. H.S. Srivastava Foundation for Science and Society.

Item Type: Article
Funders: University of Malaya Research Grant Programme (UMRG: RP005B-13BIO), CEBAR Research University Grants (RU006-2017 and RU015-2016)
Uncontrolled Keywords: Antioxidant enzymes; Banana; Lipid peroxidation; Metal composition; Sea-salt; Seawater flooding
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Science > Institute of Biological Sciences
Deputy Vice Chancellor (Research & Innovation) Office > Centre for Research in Biotechnology for Agriculture
Depositing User: Mr. Mohd Safri
Date Deposited: 17 Mar 2020 04:53
Last Modified: 17 Mar 2020 04:53

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