sible use of additional compounds to alleviate these negative
effects.
The literature suggested that a combination of GA3and ethephon prevented excessive stem elongation and also delayed tepal
and leaf senescence, as well as tepal abscission (Pisulewski et al.,
1989). Other work showed, in contrast, that this combination of
chemicals did not increase the vase life of the cut tulips investigated (Lukaszewska, 1995). The further addition of a combination
of 4gL
−1
sucrose and an antibacterial compound (200 mg L
−1
8-hydroxyquinoline citrate) still resulted in a rather short vase life
(Lukaszewska, 1995). We therefore tested whether another combination of chemicals would prevent excessive stem elongation
but also increase the life span of the tepals and leaves and delay
abscission.
The initial part of the tests was carried out with tulip cvs.
Apeldoorn and Frappant. Both cultivars showed considerable stem
elongation and early leaf yellowing, during vase life. The length of
vase life of cv. Apeldoorn tulips was limited by tepal abscission,
very shortly after the first slight senescence symptoms, whilst that
of cv. Frappant tepals was limited by tepal senescence without subsequent abscission. The chemicals used were initially applied in the
vase solution, at the onset of vase life. After optimizing the composition of a mixture of chemicals for cvs. Apeldoorn and Frappant, this
mixture was tested in a range of other cultivars. In the second part,
we investigated if the treatment found would also be applicable as
a short treatment directly after harves
sible use of additional compounds to alleviate these negativeeffects.The literature suggested that a combination of GA3and ethephon prevented excessive stem elongation and also delayed tepaland leaf senescence, as well as tepal abscission (Pisulewski et al.,1989). Other work showed, in contrast, that this combination ofchemicals did not increase the vase life of the cut tulips investigated (Lukaszewska, 1995). The further addition of a combinationof 4gL−1sucrose and an antibacterial compound (200 mg L−18-hydroxyquinoline citrate) still resulted in a rather short vase life(Lukaszewska, 1995). We therefore tested whether another combination of chemicals would prevent excessive stem elongationbut also increase the life span of the tepals and leaves and delayabscission.The initial part of the tests was carried out with tulip cvs.Apeldoorn and Frappant. Both cultivars showed considerable stemelongation and early leaf yellowing, during vase life. The length ofvase life of cv. Apeldoorn tulips was limited by tepal abscission,very shortly after the first slight senescence symptoms, whilst thatof cv. Frappant tepals was limited by tepal senescence without subsequent abscission. The chemicals used were initially applied in thevase solution, at the onset of vase life. After optimizing the composition of a mixture of chemicals for cvs. Apeldoorn and Frappant, thismixture was tested in a range of other cultivars. In the second part,we investigated if the treatment found would also be applicable asa short treatment directly after harves
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