Effects of foliar application of salicylic acid and spermine on the growth and root morphological characteristics of purple coneflower (Echinacea purpurea L.) under drought stress

Darvizheh, H., Zahedi, M. and Abbaszadeh, B. 2019. Effects of foliar application of salicylic acid and spermine on the growth and root morphological characteristics of purple coneflower (Echinacea purpurea L.) under drought stress. Plant Process and Function. 8 (30): 225-242. (In Persian).