NaCl胁迫对藜麦幼苗生长和生理指标的影响

为揭示藜麦耐盐生理机制,本研究分别采用0、50、100、150、200、250、300 mmol/L NaCl处理藜麦,于处理6、12、24、48、72、96 h后测定藜麦株高、生物量、叶绿素及类黄酮的含量。结果表明:低浓度NaCl胁迫及短时间NaCl处理(50~150 mmol/L NaCl、6~48 h)促进藜麦的生长,高浓度NaCl胁迫及长时间NaCl处理(200~300 mmol/L NaCl、72~96 h)则抑制其生长;藜麦叶片叶绿素和类黄酮含量随NaCl浓度升高呈先升后降趋势,均在100 mmol/L NaCl处理下有最大值,且随处理时间的增加呈先降后升趋势,表明适宜的NaCl浓度和处理时间会促进叶绿素和类黄酮在藜麦体内的积累,增强其抗氧化能力。

Impact of NaCl Stress on the Growth and Physiological Characteristics of Quinoa Seedlings

This study was conducted to investigate the impact of salt stress on quinoa growth at seedling stage. Quinoa seedlings at six-eight leaf stage were treated with NaCl at the concentrations of 0, 50, 100, 150, 200, 250, or 300 mmol/L. At 6, 12, 24, 48, 72, and96 hours post NaCl treatment, seedlings in each treatment were randomly selected to measure plant height, biomass, and chlorophyll and flavonoid contents, thus determining the effects of salt concentration and treatment time on the growth and physiological indexes of quinoa seedlings. The results showed that low salt stress and short treatment time(50~150 mmol/L NaCl, 6 to 48 h) promoted the growth of quinoa seedlings, while high salt stress and long treatment time(200~300 mmol/L NaCl, 72 to 96 h) inhibited their growth.The contents of chlorophyll and flavonoids in quinoa leaves rose first and then declined with increasing salt concentration, both peaking at 100 mmol/L NaCl;on the other hand, they first decreased and then increased with extending treatment time. The results suggest that appropriate salt concentration and treatment time can promote the accumulation of chlorophyll and flavonoids in quinoa seedlings and enhance their antioxidant capacity. These findings provide a theoretical basis for further study on the mechanism of salt tolerance of quinoa.