干旱胁迫下外源氯化钙、水杨酸和一氧化氮对石蒜抗旱性的影响

通过盆栽试验，研究了外源氯化钙（CaCl2）、水杨酸（SA）和NO供体硝普钠（SNP）处理对干旱胁迫下石蒜抗旱性的影响。结果表明，较低浓度的CaCl2对石蒜抗旱性的影响不显著，而随着CaCl2预处理浓度的提高，石蒜的抗旱效果显著增强。较低浓度SA和sNP可显著提高石蒜的抗旱性，而高浓度则会发生毒害作用。利用模糊隶属函数法综合评价渗透调节物质、膜系统和抗氧化酶活性多项指标可以得出，喷施10mmol·L—CaCl2、2mmol-L。SA和0．5mmol·L-1 SNP对石蒜抗旱性的提高具有显著效果。

Effects of Exogenous Calcium Chloride, Salicylic Acid and Nitric Oxide on Drought Resistance of Lycoris radiata under Drought Stress

Pot experiments were conducted to investigate the effects of exogenous calcium chloride （CaCl2）, salicylic acid （SA） and nitric oxide donor sodium nitroprusside （SNP） on drought tolerance of Lycoris radiata under drought stress. The results showed that lower concentration of CaC12 had no significant effect on drought resistance of L. radiata, while the drought resistant effect was more remarkable with the increase of pretreat- ment with different CaC12. Lower concentration of SA and SNP could significantly improve the drought resis- tance of L. radiata, while higher concentrations would lead poisonous effects. Comprehensive evaluation of os- motic regulation substance, membrane system and antioxidant enzymes activity suggested that 10 mmol-L1 CaCl2, 2 mmol·L1 SA and 0.5 mmol.L-1 SNP were the suitable pretreatment to enhance the drought resistance of L. radiata.