Abstract
A pot experiment was used to study the effects of different concentrations of salt (100, 200, 300 mmol/L) stress on the photosynthetic physiology and antioxidant enzyme activities of Solanum photeinocarpum. The results showed that NaCl of 100 and 200 mmol/L could significantly improve the contents of chlorophyll a, chlorophyll b and carotenoid in S. photeinocarpum. However, under different concentrations of salt stress, there was no significant difference in the amount of total chlorophyll in S. photeinocarpum. Besides, as the salt stress increased, the net photosynthetic rate, stomatal conductance, CO2 concentration of intercellular and transpiration rate of S. photeinocarpum gradually decreased, when the concentration of NaCl was 300 mmol/L, reached the lowest value. With the increase of salt stress, the POD activity, CAT activity and soluble sugar content of S. photeinocarpum increased first and then decreased, reaching the highest when the concentration of NaCl was 100 mmol/L. Therefore, S. photeinocarpum had a certain salt tolerance, low concentration of NaCl (≤ 200 mmol/L) stress could promote its growth, but high concentration (> 200 mmol/L) could inhibit its growth.
Highlights
Soil salinization is an important cause of land degradation and soil fertility decline [1], which causes serious waste of resources, and has a serious impact on the ecological environment and social and economic development [2]
When Paspalum vaginatum is treated with different concentrations of NaCl solution, the chlorophyll content and antioxidant enzyme activity shows a trend of increasing first and decreasing with the increase of salt concentration [7]
The low salt concentration (0%-0.2%) conditions have little effect on seed germination, seedling growth and root tip micronucleus rate; when the salt concentration is higher than 0.3%, the seed germination, seedling growth status, or root tip micronucleus are inhibited by salt [8]
Summary
Soil salinization is an important cause of land degradation and soil fertility decline [1], which causes serious waste of resources, and has a serious impact on the ecological environment and social and economic development [2]. China's salinized soil area is about 34.6 million ha, and the salinized cultivated land is 7.6 million ha. About 20% of the cultivated land is salinized, which is mainly distributed in arid, semi-arid areas and coastal areas [3, 4]. Soil salinization will cause the osmotic pressure of the soil solution to increase, and the aeration of the soil will become poor, which affects the absorption of water by plants, which in turn affects the growth of plants [5]. Studies have found that with the increase of salt stress, the chlorophyll content of Tamarix chinensis increases first and decreases [6]. When Paspalum vaginatum is treated with different concentrations of NaCl solution, the chlorophyll content and antioxidant enzyme activity shows a trend of increasing first and decreasing with the increase of salt concentration [7]. The low salt concentration (0%-0.2%) conditions have little effect on seed germination, seedling growth and root tip micronucleus rate; when the salt concentration is higher than 0.3%, the seed germination, seedling growth status, or root tip micronucleus are inhibited by salt [8]
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