Performance of Salt-Stressed Tomato Crop as Affected by Nano-Caco3, Glycine Betaine, MKP Fertilizer and Aspirin Application

Sajyan, T.K.; Shaban, N.; Rizkallah, Jad; Sassine, Y.N.

doi:10.17707/agricultforest.65.1.02

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…The different nitrate levels in this experiment showed significant inhibition of spinach growth and reduced leaf length, width, and area compared to the control. Salt stress has a significant inhibitory effect on the biomass of wheat seedlings [38] and tomatoes [39]. Gou et al [40] showed that nitrate stress significantly reduced the fresh and dry weights of cucumber seedlings.…”

Section: Growth Parametersmentioning

confidence: 99%

Changes in growth, physiology, and photosynthetic capacity of spinach (Spinacia oleracea L.) under different nitrate levels

et al. 2023

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Nitrate content is an essential indicator of the quality of vegetables but can cause stress at high levels. This study aimed to elucidate the regulatory mechanisms of nitrate stress tolerance in spinach (Spinacia oleracea L.). We studied the effects of exogenous application of 15 (control), 50, 100, 150, 200, and 250 mM NO3- on spinach growth, physiology, and photosynthesis. The results showed that all the nitrate treatments inhibited the growth of the aerial parts of spinach compared to the control. In contrast, low nitrate levels (50 and 100 mM) promoted spinach root formation, but this effect was inhibited at high levels (150, 200, and 250 mM). Treatment with 150 mM NO3- significantly decreased the root growth vigor. Low nitrate levels increased the chlorophyll content in spinach leaves, whereas high levels had the opposite effect. High nitrate levels also weakened the net photosynthetic rate (Pn), the actual photochemical efficiency of PSII Y(II), and increased non-photochemical quenching (NPQ), reducing photosynthetic performance. Nitrate stress increased the activity of nitrate reductase (NR) and promoted the accumulation of nitrate in spinach leaves, exceeding the health-tolerance limit for nitrate in vegetables, highlighting the necessity of mitigating nitrate stress to ensure food safety. Starting with the 150 mM NO3- treatment, the proline and malondialdehyde content in spinach leaves and roots increased significantly as the nitrate levels increased. Treatment with 150 mM NO3- significantly increased soluble protein and flavonoid contents, while the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) were significantly reduced in leaves. However, spinach could resist nitrate stress by regulating the synthesis of osmoregulatory substances such as proline, thus showing some nitrate tolerance. These results provide insights into the physiological regulatory mechanisms of nitrate stress tolerance and its mitigation in spinach, an essential vegetable crop.

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Section: Growth Parametersmentioning

confidence: 99%