Cytoplasmic male sterile plants are known to produce higher yields.
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This method of feeding is likely to give them good dispersal capabilities and it has been shown by DNA analysis that there is a high rate of gene flow between populations round different vents.
However, preliminary results from Co-Extra, a current project within the EU research programme, show that although cleistogamy reduces gene flow, it is not at the moment a consistently reliable tool for biocontainment: due to a certain instability of the cleistogamous trait, some flowers may open and release genetically modified pollen.
A vocal proponent of the Weidenreich Theory was Carleton Coon, however Coon modified Weidenreich's Polycentric view of evolution, since he stressed far less on gene flow.