Tag Archives: Asparagaceae

Microsporogenesis of monosulcate pollen grains in monocots

Microsporogenesis of monosulcate pollen grains in monocots

Microsporogenesis of monosulcate pollen grains in monocots

The monosulcate type is the most common pollen aperture pattern in monocots and basal angiosperms, and is considered as the ancestral condition for flowering plants. Toghranegar et al. describe microsporogenesis in 30 species belonging to eight monocot families, and find five different pathways associated with the production of monosulcate pollen grains. These pathways differ in the type of cytokinesis, the tetrad shape, and the presence and patterns of additional callose deposition after the formation of intersporal walls. In all the pathways, aperture location seems to be linked to the last points of callose deposition.

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Biogeography of subfamily Hyacinthoideae

Biogeography of subfamily Hyacinthoideae

Biogeography of subfamily Hyacinthoideae

Subfamily Hyacinthoideae (Hyacinthaceae) comprises more than 400 species, which show distjunct distribution patterns. Ali et al. use dispersal-vicariance and Bayesian binary MCMC analyses to determine that Hyacinthoideae originated in sub-Saharan Africa. The results suggest a bimodal distribution pattern with sub-Saharan Africa as the primary centre of diversity and the Mediterranean region is the secondary centre. Sub-Saharan Africa was the source area for radiation toward Madagascar, the Mediterranean region and India, whilst radiations occurred from the Mediterranean region to eastern Asia, Europe, western Asia and India

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Molecular phylogenetics of Ruscaceae

Molecular phylogenetics of Ruscaceae
Molecular phylogenetics of Ruscaceae

Previous phylogenetics studies of the monocot order Asparagales, although extensive and generally well supported, have left several sets of taxa unclearly placed and have not addressed all relationships within certain clades thoroughly. Kim et al. collect a totally new set of data for a large sampling of species and find that the results are highly similar to those of previous studies with sparser sampling. The data provide a robust framework for further studies on the family Ruscaceae (or subfamily Nolinoideae of Asparagaceae s.l.), which have been the subject of several recent controversies.

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