Photosynthetica 2019, 57(2):627-639 | DOI: 10.32615/ps.2019.043

Responses of photosynthetic apparatus in sunflower cultivars to combined drought and salt stress

M. UMAR1, Z. UDDIN2, Z.S. SIDDIQUI1
1 Stress Physiology Phenomic Centre, Department of Botany, University of Karachi, 75270 Karachi, Pakistan
2 Department of Physics, University of Karachi, 75270 Karachi, Pakistan

Response of photosynthetic apparatus in some sunflower cultivars, i.e., S.28111, Hysun-33, Hysun-39, and SF0049, to salt, drought, and combined stresses were studied. The combined stress caused severe damage to photosynthetic apparatus as compared to single stress. The maximum quantum yield of PSII, phenomenological fluxes, plastoquinone pool size, performance indexes, and driving force of absorption were greatly affected by the combined stress. Among the cultivars, the combined stress produced synergistic effect (greater damage) in Hysun-33 and cross-tolerance (lesser damage) in S.28111. Similarly, concerning the ion imbalance, S.28111 and SF0049 showed lower Na+ and Cl- concentrations with lesser electrolyte leakage as compared to Hysun-33 and Hysun-39 under salt and combined stress. Results revealed that the disturbance in photosynthetic performance could be easily determined using JIP test by measuring chlorophyll a fluorescence. This information can be useful for the screening of oil-seed crop plants having better photosynthetic performance under salinized and desertified conditions.

Additional key words: electron transport rate; malondialdehyde; nonphotochemical quenching; OJIP transient.

Received: July 5, 2018; Accepted: February 6, 2019; Prepublished online: April 29, 2019; Published: May 16, 2019  Show citation

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UMAR, M., UDDIN, Z., & SIDDIQUI, Z.S. (2019). Responses of photosynthetic apparatus in sunflower cultivars to combined drought and salt stress. Photosynthetica, 57(2), 627-639. doi: 10.32615/ps.2019.043
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