Biochemical and Genetic Analyses of Lavender-purple Spathes in Anthuriums

Wannakrairoj, Sura Wit
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Systems controlling lavender-purple spathe color in anthuriums were investigated biochemically and genetically. Regression analysis of biochemical data showed that the blueness of anthurium spathe color was the result of cyanidin 3-rutinoside and its interaction with cell sap pH and major flavonoids from A. amnicola, A. andraeanum and A. antioouense. The ratio of cyaniding 3-rutinoside to acacetin C-diglycoside was found to be the most important factor determining the degree of blueness in the regression model. Results from in vitro copigmentation experiments suggested that the inhibition effect of acacetin C-diglycoside may be due to some unknown factors strongly associated with the flavone. A. amnicola and A. antiocfuense of section Porphvrochitonium, and A. andraeanum and A. formosum of section Calomystrium were shown to be closely related based on their crossability and on the meiotic behavior of hybrids. All interspecific hybrids showed 15 bivalents at metaphase I; however, some hybrids showed spindle abnormalities. Interspecific progenies of A. amnicola produced the lowest percentage of viable pollen. A genetic scheme controlling lavender-purple spathe color was proposed. The system consisted of two loci controlling red-orange-white colors and a recessive epistatic locus for the copigmentation inhibitor. General combining ability of parental species for the quantity of the factors involved in color expression was determined.
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