Morpho-anatomical characters and ethylene production in Hibiscus rosa-sinensis L. in relation to two-day floral retention
2017
Valdoz, J.C. | Magdalita, P.M. | Absulio, W.L. | Sotto, R.C.
The cultivars of Hibiscus rosa-sinensis are known worldwide for their aesthetic value as garden or potted plants; but they have a short duration or retention of their flowers. This constraint has limited their potential in the floriculture industry because these cultivars have not been used as sources of cut flowers for floral arrangements. The main objective of this research was to find out the factors that affect duration of petal retention in Hibiscus rosa-sinensis L. accros the four breeds or varieties used, namely, 'Gelia Castillo' (GC), 'Loren Legarda' x 'Estrella F. Alabastro' (LL x EFA). 'Reddy-or-Not (RON), and 'Wilcox' (WX). Morphological traits such as peduncle diameter, receptacle diameter, peduncle length and petal thickness were related to floral retention of H. rosa-sinensis L. Moreover, the anatomy of the abscission zone was observed to provide a tissue-level basis for floral retention. Furthermore, ethylene concentrations were quantified to assess their relation to floral retention. There were no defined abscission zones in flowers of hibiscus; instead the abscissed petals had remnants, suggesting that abscission did not proceed at the petal base where the abscission zone is theoretically located. In addition, ethylene production increased as abscission progressed, typically exhibiting the climacteric pattern and the auto-catalyctic nature of ethylene biosynthesis.
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