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ISHS Acta Horticulturae 1144: III International Symposium on Postharvest Pathology: Using Science to Increase Food Availability

Postharvest physiology of floral stem of Verbena bonariensis

Authors:   S.F. Guimaraes, R.G. Rodrigues-das-Dores, F.L. Finger
Keywords:   infestations, longevity, exotic species, useful life
DOI:   10.17660/ActaHortic.2016.1144.32
The substitution of exotic ornamental species with native species is a trend in landscaping. Verbena bonariensis has a great potential as native ornamental species. Indeed, the use of native plants provides environmental benefits due to the lower requirements for maintaining and highest resistance to pathogen infection. This study evaluated postharvest features of V. bonariensis stems to determine the shelf life and possible prevalent infestations. Flower stems were collected on the UFOP campus, Brazil, voucher specimen OUPR26753, in the morning, cutting 30 cm stems that were placed in containers with 40 mL of distilled water, with eight replications. Data were analyzed for 15 days. The diameter of the stems was 1.2750.1669 cm (10 cm above the base), average weight 3.32330.5326 g, and inflorescence number 4014. During the experiment, the ambient average temperature was 21.331.16C and relative humidity 75.677.10%. The floral abscission grew with its maximum at 4th day, down 47.5%, keeping stable throughout the experiment. Fading flowers (lilac to violet colour) occurred from the 7th day, when there was greater absorption of vase solution and consequent physiological stress. The xylem blockade began on the 4th day with peak on the 15th day with total occlusion. On the 7th day, aphids and a black fungus were visualized. After 10 days of experimental conduction maturation of seeds occurred. It can be concluded that aphid infestation does not preclude the marketing stems Verbena bonariensis L., once they occur in the aging period (senescence) of flowers.

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