Effect of putrescine on biochemical and physiological characteristics of guava (Psidium guajava L.) seedlings under salt stress

摘要

Salinity is a serious concern for guava cultivation, but there are meager reports concerning application of protective supplements during growth under high salinity conditions. The present study is focused on the exogenous foliar application of putrescine to moderate salt stress in guava seedlings. Seedlings of guava were subjected to sodium chloride (0, 5 and 10 dS m(-1)) and putrescine (0, 250 and 500 ppm). Chlorophyll (a, b and total), carotenoids, proline content, electrolyte leakage as well as catalase, peroxidase and polyphenol oxidase activities were monitored. In present study, NaCl (a, b, and total). However, putrescine-treated plants exhibited a reduction in catalase and peroxidase activities. Our results confirmed the exogenous application of 250 and 500 ppm of putrescine (under 5 and 10 dS m(-1) of NaCl, respectively), may provide better salt tolerance to guava seedlings.