agronomy Article Changes in Growth and Physiological Parameters of ×Amarine Following an Exogenous Application of Gibberellic Acid and Methyl Jasmonate Piotr Salachna 1,* , Małgorzata Mikiciuk 2, Agnieszka Zawadzi ´nska 1 , Rafał Piechocki 1, Piotr Ptak 2, Grzegorz Mikiciuk 1, Anna Pietrak 1 and Łukasz Łopusiewicz 3 1 Department of Horticulture, West Pomeranian University of Technology, 3 Papie˙zaPawła VI Str., 71-459 Szczecin, Poland;
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[email protected] (P.P.) 3 Center of Bioimmobilisation and Innovative Packaging Materials, Faculty of Food Sciences and Fisheries, West Pomeranian University of Technology, 35 Janickiego Str., 71-270 Szczecin, Poland;
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[email protected]; Tel.: +48-91-4496-359 Received: 5 June 2020; Accepted: 6 July 2020; Published: 8 July 2020 Abstract: Amarine hybrids are attractive ornamental geophytes grown for cut flower production. × Their cultivation is limited due to lesser flowering percentages and lesser bulb weight gain. To optimize the growth and propagation of geophytes, plant growth regulators (PGRs) are used, but so far none have been tested in Amarine. We investigated the effect of gibberellic acid (GA3; 50, 100, and 3 × 3 200 mg dm− ) and methyl jasmonate (MeJA; 100, 500, and 1000 µmol dm− ) on growth, flowering, bulb yield, and select physiological parameters of A.