Effects of Seed Soaking with Uniconazole on Agronomic and Physiological Characteristics of Quinoa under Saline-Alkali Stress
In order to investigate the mitigative effects of seed soaking with uniconazole on the growth of quinoa seedlings under saline-alkali stress,Longli 1 was used as experimental material,the effects of seed soaking with uniconazole(0,15,30,45 and 60 mg/L)at different concentrations on the agronomic characteristics and physiological parameters of quinoa at seedling stage(28 d after sowing)under different saline-alkali stress(CK 0 g/kg,mild saline-alkali 3 g/kg,moderate saline-alkali 5 g/kg,heavy saline-alkali 7 g/kg)were studied by pot experiment.The results showed that the osmotic substance contents,antioxidant enzyme activities and root activity of quinoa seedlings were increased under low salinity(3 g/kg),so as to cope with saline-alkali environment and alleviate oxidative damage.The root-shoot ratio and seedling strength index reached the maximum under moderate saline-alkali(5 g/kg)treatment.The agronomic parameters,photosynthetic parameters,osmotic substance contents,antioxidant enzyme activities and root activity of quinoa seedlings decreased significantly under high salinity,and malondialdehyde content reached the maximum under heavy saline-alkali(7 g/kg),the results indicated that the growth of quinoa seedlings was significantly affected by salinity.At the same saline-alkali level,the root-shoot ratio,seedling strength index,chlorophyll content,osmotic substance contents,antioxidant enzyme activities and root activity of quinoa seedlings were significantly increased after seed soaking with low concentration of uniconazole,the content of malondialdehyde decreased,and the effect was the most significant when the concentration of seed soaking was 15 mg/L.
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