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ISSN 2063-5346
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Comparison among different amelioratives on improvement of tomato growth, yield and quality under low temperature condition

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Sayed F. El-Sayed, Mohamed I. A. Mohamed, Amr M. Hanafy
» doi: 10.31838/ecb/2023.12.sa1.242

Abstract

Salicylic acid (SA), acetyl salicylic acid (ASA), melatonin (Me), potassium silicate (PS) and potassium phosphonate (PP) are known to modulate physiological processes and lessen the effects of abiotic stress. High and low temperature are the most harmful sort of abiotic stress, limiting plant survival and productivity. This study aims to compare between the efficiency of the foliar application of SA (1 mM), ASA (178 mM), Me (100 μM), PS (250 mg/L), PP (3 m/L), and mix between ASA and PS (Mix), comparing with an untreated control, on the morphology, yield, and quality-related parameters of tomato plants stressed at low temperatures under Egyptian conditions. The treatments of Mix, ASA and SA increased all antioxidant Enzymatic (CAT, POD and PPO) activities. PS increased the activity of POD and PPO, while Me indued PPO only. There was improvement for non- Enzymatic compounds, namely total free amino acid, by Mix and Me, total indoles, by Mix, SA and PP and total phenols by PS, while the treatments reduced the concentrations of proline and total sugars in plants. Mix, ASA and Me improved chlorophyll B and carotenoids. Mix and SA have a positive effect on preserving tomato plants, yield, and fruit quality, Tomato plants treated with Mix showed positive effects on all traits of morphological characters, yield, fruit quality, and were significantly superior than using each of ASA and PS alone. So, the Mix treatment between ASA and PS is considered very effective as a foliar spray meliorative for tomato plants under low temperature condition.

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