תפריט נגישות
ניגודיות עדינהניגודיות גבוהה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם תפריט נגישותניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםThe transportation, storage and vase-life of ornamental commodities are considered very important stages of their production cycle in the modern ornamental horticulture industry. Therefore, research and practice to extend their viability while maintaining the highest possible quality is under continuous progress. Current ideas suggest the possible involvement of naturally occurring reductants in oxidative defense mechanisms of plants. Accordingly, it has been demonstrated that initiation of senescence processes in leaves of various herb species is associated with decrease in their oxidative defense systems. Based on these results it was suggested that exogenously applied reducing agents can retard senescence processes as well, and may therefore serve as a useful means to improve and control flower quality after harvest.
To test this suggestion, 3 water-soluble, oxidation-inhibitor agents such as morin, kaempferol and glutathione (GSH), were applied as a pre-treatment to various cut flowers and cuttings, in order to retard the senescence processes in their leaves and flower petals. The antioxidants (at concentrations of 10–2–10–4M) were applied to the various systems either as a momentary dip or as pulsing solutions for 20 h. Results show that application of morin to Godetia (Godetia grandiflora cv. 'Red') cut flowers retarded signifcantly their leaf senescence and extended by a few days longevity of the individual flowers. Application of morin, kaempferol and GSH to cut rose flowers (Rosa hybrida, cv. 'Jaguar') improved significantly the appearance and opening of the petals, and extended their vase-life by 2 days. However, the response of rose flowers to antioxidants was found to be cultivar-dependent. Dipping of pelargonium (Pelargonium -x hortorum Bailey cv. 'Isabel') cuttings in solutions of GSH or morin prior to their storage in various packaging methods, resulted in significant retardation of leaf yellowing, reduced decay and improved rooting ability following storage. The results further confirm the possible involvement of reducing compounds in oxidative defense systems of various senescing leaves and flowers. Consequently, antioxidants may provide a simultaneous control of various physiological processes such as leaf yellowing, flower opening and rooting ability, thereby exhibiting a simple means for extending longevity and improving quality of several important ornamentals.
The transportation, storage and vase-life of ornamental commodities are considered very important stages of their production cycle in the modern ornamental horticulture industry. Therefore, research and practice to extend their viability while maintaining the highest possible quality is under continuous progress. Current ideas suggest the possible involvement of naturally occurring reductants in oxidative defense mechanisms of plants. Accordingly, it has been demonstrated that initiation of senescence processes in leaves of various herb species is associated with decrease in their oxidative defense systems. Based on these results it was suggested that exogenously applied reducing agents can retard senescence processes as well, and may therefore serve as a useful means to improve and control flower quality after harvest.
To test this suggestion, 3 water-soluble, oxidation-inhibitor agents such as morin, kaempferol and glutathione (GSH), were applied as a pre-treatment to various cut flowers and cuttings, in order to retard the senescence processes in their leaves and flower petals. The antioxidants (at concentrations of 10–2–10–4M) were applied to the various systems either as a momentary dip or as pulsing solutions for 20 h. Results show that application of morin to Godetia (Godetia grandiflora cv. 'Red') cut flowers retarded signifcantly their leaf senescence and extended by a few days longevity of the individual flowers. Application of morin, kaempferol and GSH to cut rose flowers (Rosa hybrida, cv. 'Jaguar') improved significantly the appearance and opening of the petals, and extended their vase-life by 2 days. However, the response of rose flowers to antioxidants was found to be cultivar-dependent. Dipping of pelargonium (Pelargonium -x hortorum Bailey cv. 'Isabel') cuttings in solutions of GSH or morin prior to their storage in various packaging methods, resulted in significant retardation of leaf yellowing, reduced decay and improved rooting ability following storage. The results further confirm the possible involvement of reducing compounds in oxidative defense systems of various senescing leaves and flowers. Consequently, antioxidants may provide a simultaneous control of various physiological processes such as leaf yellowing, flower opening and rooting ability, thereby exhibiting a simple means for extending longevity and improving quality of several important ornamentals.
