By Gerrit Van Nigtevecht
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Extra resources for Genetic Studies in Dioecious Melandrium
In fact the same holds true for the gene abnormal. Therefore both genes might be regarded as sex-determining factors. In the differential part of one or both sex chromosomes, genes must be present that influence the growth of the pollen tubes, thus giving rise to the certation effect. An extreme certation effect, caused by a sp~cial X-chromosome, was demonstrated by crosses that yielded female offspring only (Table 3). Asthereis at the moment no proofthat the genes causing certation are sex-determining genes they must be called sex-linked genes.
We are of the opinion that the distribution ofthefemale flowers and male ones in monoecious plants is of importance. ß'LANDRIUM II 323 recent years on the influence of auxins and related substances on the development of androecium and gynoecium are likewise of interest. Particularly since more data are becoming available about the influence of hormones on gene action. e. the genes that lead to the development of a gynoecium andfor an androecium, create a physiological situation such that a change of this situation always acts in favour of the development of one of the sex organs and consequently against the other.
The time of this event will depend on the strength of the apical clominance and the distance between inhibiting bud and the inhibited ones. GENETICS OF DIOECIOUS MELANDRIUM II 327 In a flower primordium the "apical dominance" could be exerted by the developing pistil. In anormal hermaphroditic flower this apical dominance would not inhibit the formation of stamina. However, a stronger apical dominance of a pistil might inhibit the development of the stamina in the same flower, thus giving rise to an unisexual flower.