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ISHS Acta Horticulturae 937: XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on Advances in Ornamentals, Landscape and Urban Horticulture

AGRONOMIC TRAITS OF HELICONIA FOR CUT FLOWERS USE AND MOLECULAR MARKERS

Authors:   V. Loges, C.E.F. de Castro, W.N.R. Guimar„es, A.S. Costa, T.L. de A. Lima, K.P. Leite
Keywords:   tropical cut flowers, breeding, characterization, molecular markers
Abstract:
The demand for heliconia as cut flower is increasing in many countries around the world. In Pernambuco, Brazilian state, heliconia genotypes are being evaluated for agronomic traits and molecular markers. The objective of this study is to report these aspects to be used in breeding programs in the selection of heliconia as cut flower. The heliconia genotypes characters evaluated were: rhizome viability 3 months after planting; number of shoots per clump; clump area; growth habit; internal shoots; flowering period; flowering cycle; number of flowering stem per clump; shoots develop in inflorescences; height, diameter and weight of flowering stem; inflorescence type, width and length; rachis length and diameter; hair and wax presence in the inflorescence; bracts arrangement, color, firmness and depth; flowers number; insects and odors occurrence; post-harvest durability. The molecular markers analyses were isoenzyme from 19 genotypes, and RAPD analysis from 18 genotypes. It is possible to suggest that the agronomics traits for heliconia as a cut flower are: production during the whole year; short flowering cycle; light flowering stems; flowering stem longer than 80 cm with thick stem; bracts arrangement easy for handling and packing; bracts less depth and with few flowers inside; and post-harvesting durability longer than ten days. The polymorphism observed demonstrates the isoenzymes potential as genetic-biochemical markers in heliconia and results observed with the RAPD markers are considered consistent, without any environmental interference, which is common in phenotypic data, in addition to provide a broad genome coverage. Such information will be important to the selection of genotypes and serves as guidelines for studies on heliconia breeding programs.
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