INFLUENCE OF SOME PRIMING APPROACHES IN REDUCING ADVERSE EFFECTS OF SALT STRESS AT THE GERMINATION..

Basil (Ocimum basilicum L) is one of the most widely cultivated medicinal, spice, and culinary herbs. The effects of seed priming (distilled water, salicylic acid, potassium nitrate) on germination and physio-biochemical properties of basil plants in alleviating the negative effects of salinity were investigated in this study. At Ferdowsi University of Mashhad, two independent experiments were done as a factorial design based on entirely randomised design with two components (salt stress and priming) and three replications. In terms of salinity and priming impacts on germination characteristics, the data showed that salt stress had a considerable impact on all of the phenotypes tested. All of the seed priming agents tested improved germination percentage, germination rate, and germination average time under salt conditions, especially salicylic acid, which improved germination rate better than the other priming agents. Potassium nitrate effectively increased seedling length, fresh weight of seedling, and seedling vigour index. The results of research into the effects of salinity and priming on basil growth revealed that relative water content was high in plants whose seeds had been treated with potassium nitrate, and chlorophyll content was somewhat increased in plants whose seeds had been treated with salicylic acid. When compared to unprimed seeds, salicylic acid and potassium nitrate had no significant effect on total phenol and antioxidant activity, while both rose dramatically under salt stress in both unprimed and hydroprimed seeds. Overall, our findings revealed that different priming procedures improved growth characteristics of basil under salt stress at germination, the early growth stage of seedlings, and seedling growth.

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