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Postharvest performance of forced cut lilacs ‘Mme Florent Stepman’ as affected by harvest date and preservatives

100%

Skolimowska K., Lukaszewska A., Adamczyk D., Rochala J.

Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture

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2011

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tom 32

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Occurrence of blockage in cut stems of Clematis L.

100%

Jedrzejuk A., Rochala J., Rabiza-Swider J.

Acta Agrobotanica

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2013

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tom 66

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nr 1

During vase life of cut flowers obstructions in stem xylem vessels develop. Such obstructions may restrict water uptake in stems and its transport towards flowers, thus lowering their ornamental value and longevity. Clematis is a very attractive plant which can be used as a cut flower in floral compositions. However, nothing is known about the histochemical or cytological nature of xylem blockages occurring in cut stems of this plant. Observations carried out on Clematis cv. ‘Solidarność’ proved that tyloses appeared as a principal source of xylem blockage in cut stems. The preservative composed of 200 mg × dm-3 8-HQC (8-hydroxyquinolin citrate) and 2% sucrose arrested development of xylem blockage, while the vessels in stems kept in water were filled with tyloses or an amorphic substance. PAS reaction proved that polysaccharides were present in the xylem occlusions, whereas no homogalacturonans were immunolocalized in tyloses using JIM 5 and JIM 7 antibodies. The present study provides new information on the origin of xylem occlusions in clematis and their development in two different vase solutions. Such information can be useful to develop proper postharvest treatments aiming to improve keeping qualities of this new cut flower.

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Comparison of petal senescence in forced and unforced common lilac flowers during their postharvest life

100%

Jedrzejuk A., Rochala J., Dolega M., Lukaszewska A.

Acta Physiologiae Plantarum

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2013

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tom 35

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nr 06

Recently, the programmed cell death (PCD) is studied in the context of the postharvest longevity of cut flowers with the goal of slowing down the processes that ultimately lead to flower death, and to ensure a long display life of cut plant material. In this study, the phenomenon of PCD in petals of common lilac (Syringa vulgaris L.) was observed, aimed to compare degradation of petal cells in flowers blooming under natural conditions with those forced in November. For the early lilac forcing, a deep dormancy has to be broken by high temperatures 35–37 C negatively affecting postharvest life of cut branches. The trials included as well the observation of the effect of two flower preservatives on the PCD in order to see if the prolongation of the lilac vase life was associated with a delay in the onset of the PCD symptoms. The vase life of cut lilacs was significantly increased by both preservatives. The first symptoms of PCD were evident in the flower bud stage. In petals from forced shrubs, the first symptoms of cell degradation were much more advanced than in lilacs blooming naturally in May. In forced flowers held in the preservatives, the degradative changes in cells occurred later than in those kept in water, but they were accelerated relative to a flower developmental stage.

Ograniczanie wyników

1 Acta Agrobotanica

1 Acta Physiologiae Plantarum

1 Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture

3 Rochala J.

2 Jedrzejuk A.

2 Lukaszewska A.

1 Adamczyk D.

1 Dolega M.

1 Rabiza-Swider J.

1 Skolimowska K.

2 2013

1 2011

Postharvest performance of forced cut lilacs ‘Mme Florent Stepman’ as affected by harvest date and preservatives

Occurrence of blockage in cut stems of Clematis L.

Comparison of petal senescence in forced and unforced common lilac flowers during their postharvest life