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Zhe Cao, Zhanao Deng and Mike Mclaughlin

×hortulanum for fancy-leaved caladium. Little information is available in the literature about the parentage of fancy-leaved caladium cultivars that were produced in other countries or those produced in Florida before 1976. The species that contributed to the

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Zhanao Deng, Fahrettin Goktepe, Brent K. Harbaugh and Jinguo Hu

included as outgroups for the dendrogram. Table 1. List of 45 caladium commercial cultivars ( Caladium × hortulanum ) used in this study, their leaf characteristics (shape, main vein color, impact color, and presence of spots or blotches), stress

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Zhanao Deng and Brent K. Harbaugh

Cultivated caladiums ( Caladium × hortulanum Birdsey) are members of the aroid family and have been important pot and landscape plants ( Evans et al., 1992 ). They are known for their bright and colorful leaves, adaptation to tropical and

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Zhanao Deng, Fahrettin Goktepe and Brent K. Harbaugh

th century, breeding of this crop has been conducted primarily in Florida ( Wilfret, 1993 ). It is generally believed that cultivated caladiums ( C . × hortulanum ) resulted from intraspecific or interspecific hybridizations among several Caladium

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Zhe Cao, Shunzhao Sui, Qian Yang and Zhanao Deng

Gibberellic acid (GA 3 ) stimulates flowering in Caladium hortulanum Birdsey HortScience 14 72 73 Henny, R.J. 1982 Inheritance of foliar variegation in two Dieffenbachia cultivars J. Hered. 73 384 Henny, R.J. 1992 Inheritance of the foliar variegation

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Fahrettin Goktepe, Teresa Seijo, Zhanao Deng, Brent K. Harbaugh, Natalia A. Peres and Robert J. McGovern

Caladiums ( Caladium × hortulanum Birdsey) are ornamental aroids valued for their bright, colorful leaves. They are widely used in landscapes, especially in the southern United States, and in production of pot plants worldwide ( Evans et al

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Michelle A. Grabowski and Dean K. Malvick

caladium cultivars in controlled environments, suggesting that there may be varying levels of resistance to S. sclerotiorum within cultivars of caladium. The pedigrees of many cultivars of Caladium ×hortulanum are unknown, but most are believed to

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Zhanao Deng and Brent K. Harbaugh

their excellent technical support. This research was funded by the Florida Agricultural Experiment Station (FAES) and grants from the Florida Caladium Growers' Association and the Gloeckner Foundation.

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Zhanao Deng and Brent Harbaugh

Caladiums (Caladium×hortulanum) are ornamental aroids often forced in containers or grown in the landscape for their colorful leaves. The aesthetic value of caladium plants is largely determined by their leaf characteristics. Caladium breeding can be traced back to the mid-1800s when Gregor Mendel conducted his plant hybridization experiments, but information on the inheritance of caladium traits has been rather scant. To understand the mode of inheritance for three typical leaf shapes and three main vein colors in caladium, controlled crosses were made among commercial cultivars and breeding lines, and segregation of leaf shape and/or main vein color in the progeny was analyzed. The observed segregation ratios indicated that a single locus with three alleles seemed to determine the main vein color in caladium. The white vein allele was dominant over the green vein allele, but recessive to the red vein allele, which was dominant over both white and green vein alleles. The three leaf shapes (fancy, lance, and strap) in caladium seemed to be controlled by two co-dominant alleles at one locus. Leaf shape segregation was skewed in some crosses, which might imply the existence of other factors involved in caladium leaf shape development. Chi-square tests revealed that leaf shape and main vein color were inherited independently in caladium.

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Lyn A. Gettys and William T. Haller

plants in landscapes that are irrigated with herbicide-treated water. Materials and methods Anthurium, caladium, spathiphyllum, and syngonium were purchased in Apr. and May 2009 from Agri-Starts IV, Inc. in Apopka, FL. All plants were purchased as liners