Aaron Rottenberg

TL;DR: The wild cardoon is established as the wild ancestor of the cultivated vegetable Cynara cardunculus, and all other five wild Cynara species turned to be almost fully-or fully-cross-incompatible with the crop, and the few interspecific F1 hybrids recovered were partly or almost fully sterile.

TL;DR: The field survey suggests that in dioecious plants sex determination and expression are usually effectively maintained, and the very slight deviations from the 1:1 sex ratio and from the distinct male and female morphs suggest that sexual dimorphism in diodic plants is usually stabile.

TL;DR: The genetic affinities between the cultivated artichoke Cynara cardunculus L.cardunculus and its wild relatives were assessed by tests of 20 enzyme systems (28 loci) and implicates wild C. card unculus in the wild ancestry of the cultivatedArtichoke.

TL;DR: The genetic polymorphism of three populations of the dioecious riparian tree Populus euphratica Oliv was examined with isozyme tests, finding the highest genetic diversity was found in the central, sexually dimorphic population; however, the sexually monomorphic (unisexual) marginal populations also manifested some genetic diversity.

TL;DR: The inability of the rare bisexual individuals to fully invest in the two genders suggests that trade-offs between male and female functions possibly play a major role in the breeding systems of these dioecious species, and probably implicates resource allocation as a selective force in the evolution of dIOecy.