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Investigation of yield, phytochemical composition, and photosynthetic pigments in different mint ecotypes under salinity stress
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Investigation of yield, phytochemical composition, and photosynthetic pigments in different mint ecotypes under salinity stress
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Journal Article
Investigation of yield, phytochemical composition, and photosynthetic pigments in different mint ecotypes under salinity stress
2021
Overview
Salinity stress is one of the main limiting factors of medicinal plant growth and may affect their characteristics and chemical composition. In order to evaluate the response of different species of Iranian mint to salinity stress, an experiment was designed in greenhouse conditions. In this experiment, six Iranian mint species were cultivated in pots under different salinity stress including 0, 2.5, 5, and 7.5 dS/m. The chlorophyll indices (a, b, total, and a/b ratio), carotenoids, total anthocyanin, total phenolic and flavonoid content, antioxidant activity, dry matter yield, and essential oil content were measured in two different harvest stages. Salinity stress affected various measured traits. The results showed that despite the negative effect of salinity stress on photosynthetic pigments, in some ecotypes and species, photosynthetic pigments were not affected by salinity stress. The amount of total phenolic content, total flavonoid content, and total anthocyanin increased in response to salinity stress. The dry matter decreased under salinity stress, but the content of essential oil increased as a result of salinity stress increment. The results of PCA biplot showed that the E16 and E18 ecotypes were separated by a large distance. Among the various ecotypes, E18 had the most desirable traits which can be recognized as a salt‐tolerant ecotype. Also, piperita species was the best among the species in all salinity stress levels. Among the various ecotypes, E18 accounted for the most desirable traits in most of the studied traits and was recognized as a salt‐tolerant ecotype.
