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Publication Type J
Authors Abideen, Z., H. W. Koyro, B. Huchzermeyer, M. Z. Ahmed, F. Zulfiqar, T. Egan and M. A. Khan
Title Phragmites karka plants adopt different strategies to regulate photosynthesis and ion flux in saline and water deficit conditions
Source Plant Biosystems
Author Keywords Halophytic giant grass ion homeostasis leaf gas-exchange osmotic stress photochemical efficiency sodium toxicity water relation chlorophyll fluorescence salt tolerance gas-exchange osmotic adjustment xanthophyll cycle oxidative stress leaf senescence drought growth responses
Abstract Phragmites karka (Retz.) Trin. ex Steud. is a pan-tropical, wetland, grass, and this study restricted water availability to P. karka by either low matric potential (water deficit) or low osmotic potential (salinity). Growth, water relations, mineral nutrition, and photosynthesis were compared when plants were irrigated at control (100% water holding capacity WHC), 300 mM NaCl (salinity, at 100% WHC), or water deficit (40% WHC) conditions. Leaf water potential and plant growth decreased substantially under salinity and water deficit. This led to stomatal closure and a decrease in gas exchange with the risk of oxidative injury. Under saline conditions, stress was mitigated by an increased dissipation of absorbed light energy by non-photochemical quenching. Water deficit conditions led to higher PS II quantum yield efficiency. Shoot Na+ toxicity was reduced by 10-fold higher Na+ sequestration in salt-treated roots, and enhanced proline and soluble carbohydrate accumulation in the leaf, compared to the control. Inorganic and organic substances maintained a higher soil-to-plant water gradient in salt-stressed plants compared to drought-stressed plants. P. karka survived in both forms of restricted water via growth plasticity, regulated osmotic and ionic homeostasis, and efficient gas exchange and PSII photochemistry.
ISSN 1126-3504
ISBN 1126-3504
29-Character Source Abbreviation Plant Biosyst.
Digital Object Identifier (DOI) 10.1080/11263504.2020.1762783
Unique Article Identifier WOS:000533767900001
Plants associated with this reference

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