Effects of Exogenous Nitric Oxide on Growth and Physiological Characteristics of Asparagus Bean Deedlings Under Cold Stress

The effects of exogenous NO donor sodium nitroprusside(SNP) solution with different concentrations on the growth and physiology characteristics of Asparagus bean seedlings which were treated at 8 ℃ low temperature stress were studied. The results showed that the leaf area, root/shoot ratio and strong seedling index increased;the content of proline, soluble protein and chlorophyll increased and the content of MDA decreased for the 0.5 ~1.5 mmol/L exogenous NO treatment. The alleviating effects of exogenous NO with too high or too low concentration on the growth were not significant and the content of MDA increased when the exogenous NO concentration was too low. The exogenous NO with proper concentration could promote the formation of proline, soluble protein, improve the content of chlorophyll and decrease membrane lipid peroxidation to enhance the adaptability for low temperature stress.