Morphological, physiological, and biochemical responses of onion (Allium cepa L.) breeding lines to single and combined salt and drought stresses

Abiotic stresses deteriorate plant growth resulting in devastating yield losses. Salt stress solely cause ionic toxicity and disturbed homeostasis, whereas combined salt drought has more pronounced effects on plants. This study aimed to screen 32 Turkish onion breeding lines commercial cultivars based their morpho-physiological biochemical responses after exposure drought, salt, + at the bulbification stage under greenhouse conditions. Physiological characteristics, such as gaseous exchange traits, chlorophyll index, leaf temperature, morphological traits including number of leaves, length, diameter were measured during treatment, response onions was quantified by measuring bulb diameter, weight harvest. Proline malondialdehyde accumulation estimated for effect genotypes. All genotypes responded differentially applied single stresses. Overall results revealed that K25, U6, U17 cultivar K58, (41.71–47.93 g) significantly (p ≤ 0.05) lower, therefore they grouped sensitive across all stresses; K41, U47, U49 K52, (96.75–106.31 higher among tested found be most stable upon stress. These resilient can used material future abiotic studies.