Abstract
Turnera ulmifolia L. is a polymorphic complex of diploid, tetraploid and hexaploid varieties. Diploids and tetraploids are distylous and hexaploids homostylous. A controlled crossing programme demonstrated that in diploids distyly is controlled by a single locus with two alleles. Long-styled plants are ss and short-styled plants can be either Ss or SS. In tetraploids a similar pattern occurs with short-styled plants usually Ssss and long-styled plants ssss. Tetrasomic inheritance was demonstrated by crosses with a SSss genotype synthesised by colchicine doubling. Double reduction could not be detected at the distyly locus. No significant deviation from a 1:1 morph ratio was observed in surveys of nine natural populations and progeny tests of 21 open-pollinated familes from Brazil. Crosses between distylous and homostylous populations were undertaken to determine the inheritance of homostyly. The results were consistent with a model of supergene control. Clear segregation of phenotypes was observed in the F1, and the dominance relationships S>h>s, where h is an allele that determines homostyly, were obtained.
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Shore, J., Barrett, S. The genetics of distyly and homostyly in Turners ulmifolia L. (Turneraceae). Heredity 55, 167–174 (1985). https://doi.org/10.1038/hdy.1985.88
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DOI: https://doi.org/10.1038/hdy.1985.88
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