civilize caladium ( Caladium × hortulanum ; 2n = 2x = 30 ) is an significant ornamental arum for the environmental horticulture industry . A better sympathy of its genetic diversity is ask for the go on improvement of caladium . The caladium germplasm maintained in the University of Florida ’s caladium breeding program were surveyed for possible mutation in chromosome issue and atomic DNA content to gain a better understanding of caladium genetic diversity at the cytogenetic level .
For the first sentence , caladium triploidy was discovered in two breeding stemma , UF-15 - 414 and UF-4407 , with 2n = 3x = 45 chromosomes and a atomic DNA content of 13.86 pg·2C−1 . In gain , a new chromosome number ( 2n = 2x = 34 ) was found in one cultivar , ‘ White Wing . ’ liken with their diploid parents or grandparents , the triploids show a distinct , attractive leaf word structure with rounder and thickheaded leaves . The pollen stainability of UF-15 - 414 and UF-4407 was 63 % and 73 % , severally , indicating potential male fecundity , which was unexpected .
depth psychology of simple sequence repetition ( SSR ) marker striation patterns sustain that UF-15 - 414 was a direct progeny of UF-4407 through cross with the diploid cultivar Aaron , whereas UF-4407 might result from the merger of an unreduced ( female or male ) gamete with a reduced gamete . Chromosome counting and SSR mark depth psychology of ‘ White Wing ’ and its progeny cultivars ‘ White Wonder ’ and ‘ White Delight ’ suggested that ‘ White Wing ’ possibly transmitted its 34 chromosomes to progeny during sexual replication .
The discovery and enactment of these triploids revealed the natural event of natural sexual polyploidization in caladium and indicated good potential for create and selecting new triploids for future caladium fosterage . The observed fresh chromosome number in ‘ White Wing ’ and its issue cultivars implies that other chromosome variations may be present among cultivated caladium . In summary , these results revealed two male - productive triploid caladiums and a young chromosome number that can enrich the cytogenetic diversity in future caladium cultivar developing .
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