Effects of Exogenous Salicylic Acid and Methyl Jasmonate on the Physiological Characteristics of Rosa chinensis ‘Old Blush’ under Salt Stress

PurposeTo study the effects of salicylic acid and methyl jasmonate on the physiological characteristics of Rosa chinensis ‘Old Blush’ under salt stress.

MethodsThe cutting seedlings were treated with high salt stress, exogenous hormone, salt stress and exogenous hormone co-treatment by hydroponic culture, and the chlorophyll content, proline content, malondialdehyde content, activity of peroxidase, activity of catalase and activity of superoxide dismutase were measured in the treatment group and control group.

ResultCompared with the simple salt stress, the external application of salicylic acid under salt stress and external application of methyl jasmonate under salt stress could respectively increase the chlorophyll content in leaves of ‘Old Blush’ by 98.03% and 80.05%; these two external application resulted in a 57.23% and 49.72% increase of proline content in leaves of ‘Old Blush’ and a 56.75% and 89.31% increase of proline content in roots of ‘Old Blush’; these also resulted in a 29.92% and 16.79% decrease of malondialdehyde content in leaves and a 28.62% and 20.52% decrease of malondialdehyde content in roots.

ConclusionThe external application of salicylic acid and methyl jasmonate both could alleviate the damage of salt stress on ‘Old Blush’, and the effect of methyl jasmonate is better than that of salicylic acid.