in

Host-plant stimulation of germination in parasitic Phelipanche

Host-plant stimulation of germination in parasitic Phelipanche
Host-plant stimulation of germination in parasitic Phelipanche

The tiny seeds of the obligate root parasitic plants of the Orobanchaceae do not germinate unless they detect chemical signals from a host plant. Joel et al. study seed ultrastructure and find that mucilage swelling in the extended labyrinthine endothelium walls leads to opening of the micropyle. The perisperm cells underneath this opening mediate between the rhizosphere and the embryo, and are the likely to be the location for the receptors of germination stimuli. Other seed tissue characteristics are described in relation to water absorption and nutrient transport before and during germination.

Written by Annals of Botany Office

The Annals of Botany Office is based at the University of Oxford.

Soil seed bank recovery in semi-arid vegetation

Soil seed bank recovery in semi-arid vegetation

Varying fire-response strategies and co-occurring traits

Varying fire-response strategies and co-occurring traits