Abstract
Abstract. Cut leaves of Zantedeschia aethiopica and Z. elliottiana are widely used as the florists’green. Over the years we studied the parameters related to postharvest quality of leaves in the two above species. Here the effect of plant hormones known to delay leaf senescence (benzyladenine and gibberellic acid) and of the standard preservative solution (8-HQC + 2 % sucrose) on the reducing sugars contents is presented. BA (0.1 mmol·dm-3) and GA3 (0.25 mmol·dm-3) were applied as 24 h pulse treatments. Pulsed and unpulsed leaves were kept either in water or in the preservative. In both species contents of reduc-ing sugars during their senescence in vases initially rose and then dropped to 60–80 % of the initial levels. Pretreatment with BA did not counteract a decrease in reducing sugar contents while in the GA3-treated leaves sugar loss was prevented in Z. aethiopica and a 20 % increase occurred in Z. elliottiana. Placing leaves in the sugar containing solution provoked a dramatic loss of reducing sugars in Z. aethiopica (to 12 % of the initial level) while in Z. elliottiana this loss was less pronounced (52 % of the initial value). Cytokinin did not mitigate the negative effect of the preservative on reducing sugar losses while GA3 was more effective in this respect. Results of analyses do not support hypothesis that sugar depletion might be a cause of senescence of detached leaves in the two Zant-edeschia species. Key words: reducing sugars, cut leaves, florists ’ green, gibberellic acid, benzyladenine,
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Claims 10
Claim · model-written summary
In both Zantedeschia species, reducing sugar contents initially rose during senescence in vases.
- Taxon
- Zantedeschia aethiopica and Z. elliottiana
Zantedeschia aethiopica_Zantedeschia_elliottiana.jpg?width=60)
Zantedeschia elliottianae0 - Organ / stage
- Cut leavese0
- Outcome
- contents of reduc-ing sugarse1
- Direction
- initially rosee1
- Setting
- in vasese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Zantedeschia_elliottiana.jpg?width=500)
Verbatim
e0“Cut leaves of Zantedeschia aethiopica and Z. elliottiana”
e1“In both species contents of reduc-ing sugars during their senescence in vases initially rose and then dropped to 60–80 % of the initial levels”
Claim · model-written summary
In both Zantedeschia species, reducing sugar contents dropped to 60–80 % of the initial levels during senescence in vases.
- Taxon
- Zantedeschia aethiopica and Z. elliottianaZantedeschia aethiopicaZantedeschia elliottianae0
- Organ / stage
- Cut leavese0
- Outcome
- contents of reduc-ing sugarse1
- Direction
- droppede1
- Value
- 60–80 %e1
- Setting
- in vasese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cut leaves of Zantedeschia aethiopica and Z. elliottiana”
e1“In both species contents of reduc-ing sugars during their senescence in vases initially rose and then dropped to 60–80 % of the initial levels”
Claim · model-written summary
Pretreatment with benzyladenine did not prevent the decrease in reducing sugar contents relative to unpulsed leaves.
- Taxon
- Zantedeschia aethiopica and Z. elliottianaZantedeschia aethiopicaZantedeschia elliottianae0
- Organ / stage
- Cut leavese0
- Treatment
- Pretreatment with BAe3
- Outcome
- reducing sugar contentse3
- Direction
- no_changeinferrede3
- Comparator
- unpulsed leavese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cut leaves of Zantedeschia aethiopica and Z. elliottiana”
e2“Pulsed and unpulsed leaves were kept either in water or in the preservative”
e3“Pretreatment with BA did not counteract a decrease in reducing sugar contents”
Claim · model-written summary
Gibberellic acid pretreatment prevented sugar loss in Z. aethiopica leaves relative to unpulsed leaves.
- Taxon
- Z. aethiopicaZantedeschia aethiopicae4
- Organ / stage
- Cut leavese0
- Treatment
- GA3e4
- Outcome
- sugar losse4
- Direction
- preventede4
- Comparator
- unpulsed leavese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cut leaves of Zantedeschia aethiopica and Z. elliottiana”
e2“Pulsed and unpulsed leaves were kept either in water or in the preservative”
e4“in the GA3-treated leaves sugar loss was prevented in Z. aethiopica and a 20 % increase occurred in Z. elliottiana”
Claim · model-written summary
Gibberellic acid pretreatment increased reducing sugar contents by 20 % in Z. elliottiana leaves relative to unpulsed leaves.
- Taxon
- Z. elliottianaZantedeschia elliottianae4
- Treatment
- GA3e4
- Outcome
- reducing sugar contentse3
- Direction
- increasee4
- Value
- 20 %e4
- Comparator
- unpulsed leavese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Pulsed and unpulsed leaves were kept either in water or in the preservative”
e3“Pretreatment with BA did not counteract a decrease in reducing sugar contents”
e4“in the GA3-treated leaves sugar loss was prevented in Z. aethiopica and a 20 % increase occurred in Z. elliottiana”
Claim · model-written summary
Placing leaves in the sugar-containing solution caused a loss of reducing sugars to 12 % of the initial level in Z. aethiopica compared with water.
- Taxon
- Z. aethiopicaZantedeschia aethiopicae6
- Treatment
- Placing leaves in the sugar containing solutione6
- Outcome
- loss of reducing sugarse6
- Direction
- losse6
- Value
- 12 %e6
- Comparator
- watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Pulsed and unpulsed leaves were kept either in water or in the preservative”
e6“Placing leaves in the sugar containing solution provoked a dramatic loss of reducing sugars in Z. aethiopica (to 12 % of the initial level)”
Claim · model-written summary
Placing leaves in the sugar-containing solution caused a loss of reducing sugars that was less pronounced in Z. elliottiana (52 % of the initial value) compared with water.
- Taxon
- Z. elliottianaZantedeschia elliottianae7
- Treatment
- Placing leaves in the sugar containing solutione6
- Outcome
- loss of reducing sugarse6
- Direction
- less pronouncede7
- Value
- 52 %e7
- Comparator
- watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Pulsed and unpulsed leaves were kept either in water or in the preservative”
e6“Placing leaves in the sugar containing solution provoked a dramatic loss of reducing sugars in Z. aethiopica (to 12 % of the initial level)”
e7“while in Z. elliottiana this loss was less pronounced (52 % of the initial value)”
Claim · model-written summary
The results do not support sugar depletion as a cause of senescence of detached leaves in the two Zantedeschia species.
- Taxon
- Zant-edeschia
Zantedeschiae0 - Outcome
- senescence of detached leavese0
- Qualifier
- sugar depletion might be a causee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results of analyses do not support hypothesis that sugar depletion might be a cause of senescence of detached leaves in the two Zant-edeschia species”
Claim · model-written summary
Gibberellic acid was more effective than cytokinin in mitigating the preservative-induced loss of reducing sugars.
- Taxon
- Zantedeschia aethiopica and Z. elliottianaZantedeschia aethiopicaZantedeschia elliottianae0
- Treatment
- GA3e1
- Outcome
- reducing sugar lossese1
- Direction
- more effectivee1
- Comparator
- Cytokinine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cut leaves of Zantedeschia aethiopica and Z. elliottiana”
e1“Cytokinin did not mitigate the negative effect of the preservative on reducing sugar losses while GA3 was more effective in this respect”
Claim · model-written summary
Cytokinin pretreatment did not mitigate the negative effect of the preservative on reducing sugar losses.
- Taxon
- Zantedeschia aethiopica and Z. elliottianaZantedeschia aethiopicaZantedeschia elliottianae0
- Treatment
- Cytokinine1
- Outcome
- reducing sugar lossese1
- Direction
- no_changeinferrede1
- Comparator
- preservativee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cut leaves of Zantedeschia aethiopica and Z. elliottiana”
e1“Cytokinin did not mitigate the negative effect of the preservative on reducing sugar losses while GA3 was more effective in this respect”