Post-Harvest Longevity of Leaves of the Iberian Cranesbills (Geranium platypetalum Fisch. et Mey.) after the Application of Gibberellic Acid

B. JANOWSKA1, M. RYBUS-ZAJĄC2, P. DERĘGOWSKA1, M. KUJAWA2, P. WRÓBLEWSKA2 and R. ANDRZEJAK3
1 Poznań University of Life Sciences, Department of Ornamental Plants, Faculty of Horticulture and Landscape Architecture, 60-594 Poznań, Poland
2 Poznań University of Life Sciences, Department of Plant Physiology, Faculty of Horticulture and Landscape Architecture, 60-637 Poznań, Poland
3 Poznań University of Life Sciences, Department of Phytopathology and Seed Science Technology, Faculty of Horticulture and Landscape Architecture, 60-594 Poznań, Poland

Abstract

JANOWSKA, B., M. RYBUS-ZAJĄC, P. DERĘGOWSKA, M. KUJAWA, P. WRÓBLEWSKA and R. ANDRZEJAK, 2015. Post-harvest longevity of leaves of the Iberian cranesbills (Geranium platypetalum Fisch. et Mey.) after the application of gibberellic acid. Bulg. J. Agric. Sci., 21: 579–584

In the following study the influence of Geranium platypetalum leaves conditioning in gibberellic acid onto their post-harvest longevity and quality was assessed. Leaves were conditioned in water solution of gibberellic acid (GA 3) at the concentration of 25 and 50 ppm for 4 and 24 hours. 4-hour leaves conditioning was conducted in a room at the temperature of 18-20°C, and with 10-hour photoperiod and under fluorescent light of quantum irradiance of 25 μmol∙m-2∙s-1. 24-hour leaves conditioning was conducted in a cool room at the temperature of 5°C. Afterwards, the leaves were placed in distilled water. Leaves from the control group were placed in distilled water immediately after harvesting. 24-hour conditioning of Geranium platypetalumleaves in gibberellic acid at the concentration of 25 and 50 ppm prolonged their post-harvest longevity by 9.4 – 23.2 days. Gibberellic acid had a retarding effect onto chlorophyll decomposition in leaves. 4 and 24-hour conditioning of Geranium platypetalumleaves in gibberellic acid at the concentration of 25 and 50 ppm has a favourable effect onto protein content at different stages of the advancing ageing process. Conditioning of Geranium platypetalum leaves in gibberellic acid at the concentration of 25 ppm for 24 hours and in GA 3 at the concentration of 50 ppm increased the saccharides content.

Key words: florists’ greens, growth regulators, index of leaves greenness, longevity, protein, saccharides

See the article as a PDF.