Gynodioecy in origanum vulgare: computer simulation of a model

ABSTRACT THE population dynamics of the rare male sterility factors, or of gynodioecious species, which have a characteristically high proportion of female (male-sterile) and hermaphrodite

individuals together in a population, is interesting to both evolutionists and plant breeders. Many workers have discussed the evolutionary significance of such a mating system, which

promotes outbreeding with the proportion of females regulating the degree of outbreeding (for example, refs. 1–3). In _Origanum vulgare_ (Labiateae), Lewis and Crowe4 estimated that nearly

30 per cent, or even as many as 50 per cent, of females occur in various European populations. They showed that two loci govern the gynodioecy system; a dominant factor _F_ causes anther

suppression in combination with the recessive class _hh_ to give _FFhh_ and _Ffhh_ as females, whereas _HH_, _Hh_ suppress factor _F_ to yield the other seven genotypes as hermaphrodites.

Furthermore, certain segregation ratios suggested to them that the females are maintained through almost lethality of _ffhh_, lower viability of _HH_ genotypes and poorer seed output of

hermaphrodites than females. Thus if the fitness values are denoted by the matrix their data suggest that _z_ is nearly 0, _y_ = 0.25 to 0.50 and _x_>_w_. Access through your institution

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OTHERS THE EVOLUTION AND MAINTENANCE OF TRIOECY WITH CYTOPLASMIC MALE STERILITY Article Open access 14 October 2024 PLANT SEX CHROMOSOMES DEFY EVOLUTIONARY MODELS OF EXPANDING RECOMBINATION

SUPPRESSION AND GENETIC DEGENERATION Article 29 March 2021 WIDESPREAD COEXISTENCE OF SELF-COMPATIBLE AND SELF-INCOMPATIBLE PHENOTYPES IN A DIALLELIC SELF-INCOMPATIBILITY SYSTEM IN _LIGUSTRUM

VULGARE_ (OLEACEAE) Article 04 September 2021 REFERENCES * Whitehouse, H. L. K., in _Darwin's Biological Work_ (edit. by Bell, P. R., _et al._) (Cambridge University Press, London,

1959). Google Scholar  * Crowe, L. K., _Heredity_, 19, 435 (1964). Article  Google Scholar  * Baker, H. G., _Evolution_, 20, 349 (1966). Article  CAS  Google Scholar  * Lewis, D., and Crowe,

L. K., _Evolution_, 10, 115 (1956). Article  Google Scholar  * Jain, S. K., _Genetics_, 46, 1237 (1961). PubMed  PubMed Central  CAS  Google Scholar  * Holden, J. H. W., and Bond, D. A.,

_Heredity_, 15, 175 (1960). Article  Google Scholar  * Ross, M. D., _Genetics_, 56, 584 (1967). Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department

of Agronomy, University of California, Davis S. K. JAIN Authors * S. K. JAIN View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS

Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE JAIN, S. Gynodioecy in _Origanum vulgare_: Computer Simulation of a Model. _Nature_ 217, 764–765 (1968).

https://doi.org/10.1038/217764a0 Download citation * Received: 18 December 1967 * Issue Date: 24 February 1968 * DOI: https://doi.org/10.1038/217764a0 SHARE THIS ARTICLE Anyone you share the

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