Abstract
ABSTRACT The effect of sodium nitroprusside (SNP) in inducing the activity of the defence system enzymes and their role in the vase life of two Polianthes tuberosa cultivars (‘Mahalati’ and ‘Dezfouli’) was investigated. SNP pulsing (150 μM for 0, 24 and 48 h) induced the activity of the antioxidant enzymes, superoxide dismutase (SOD) and peroxidase (POX) up to 6 and 3 days after application, respectively. Also, the activities of phenylalanine ammonia-lyase (PAL) and polyphenol oxidase (PPO) increased in SNP-treated plants until 3 and 6 days after application, respectively. The activity of these enzymes after 48 h pulsing was higher than 24 h pulsing. However, in most cases, there was no statistical difference between these two treatments. The chlorophyll degradation was reduced and the electrolyte leakage and malondialdehyde accumulation in the petals of the SNP-treated plants were limited. These responses increased the vase life and opening rate of the florets. The increased activity of PAL and PPO is probably due to improving antimicrobial activity in the stem and improved vase solution uptake by flowers up to 9 days after the treatments. SNP pulsing for 24 h was suggested for increasing the vase life and quality of P. tuberosa cut flowers.
Published Version
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