Abstract
In order to study the effect of external ethylene on postharvest display and activity of some senescence-related enzymes in potted miniature roses, this experiment was carried out in a completely randomized design, using three treatment levels with three replications. In glass chambers, potted miniature rose plants were exposed to ethylene concentrations of 0, 5 and 10 μL L-1 for 12 h. The results of study showed that the application of ethylene affected morphological and physiological properties and activity of antioxidant enzymes, as well as laccase enzyme in treated plants. Stress of ethylene in miniature roses caused to increase the percentage of leaf abscission and laccase enzyme activity. Studying defensive mechanism by measuring antioxidant enzymes showed that after using stress of ethylene activity of peroxidase enzyme was gradually decreased. Ethylene concentration of 10 μL L-1 caused to increase activity of peroxidase enzyme in primary days after exposing to ethylene stress but enzyme activity was gradually decreased till the final days. In other side, increasing peroxidation rate of membrane lipids under ethylene stress condition shows plant inability to eliminate or balance oxygen free radicals. Activity of laccase in stressed plants was increased significantly during time, concomitant with decreasing chlorophyll and proline content.
Highlights
Miniature roses (Rosa hybrida) are well known as one of the world’s most popular ornamental plants grown world widely as potted plants
The characteristics of postharvest display including leaf abscission, chlorophyll content, activity changes of enzyme peroxidase and laccase, membrane lipid peroxidation and proline in vegetative organs of potted miniature rose were evaluated during this study
Comparing averages based on least significant difference (LSD) test was done in five percent probability levels (P
Summary
Miniature roses (Rosa hybrida) are well known as one of the world’s most popular ornamental plants grown world widely as potted plants. Postharvest display quality and life of flowers are key factors, which are considered in acceptance of miniature rose in international marketing trade especially for exporting to distance markets. In commercial view, yellowing of leaf and falling leaf, flower and bud organs decrease popularity of potted plant especially roses [1]. When plants produce ethylene or are exposed to external source of ethylene, receptors perceive ethylene and the signal is transferred, resulted in downstream genes activation. The main effects of external and/or internal ethylene on potted roses include leaf yellowing and abscission, acceleration of bud and flower shedding, flower premature aging and decreasing of flower vase life [5]. Some anti-ethylene agents such as 1-MCP can suppress ethylene action by occupation of place of ethylene on receptors, resulting in improving postharvest display of rose plants [7,8]
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