No sex required: Gene trigger for asexual reproduction discovered

A German-Israeli team led has discovered a gene trigger in the moss Physcomitrella patens which leads to offspring without fertilization. The researchers assume that this mechanism is conserved in evolution and holds the key to answer fundamental questions in biology.

"Just like humans and animals, mosses possess egg cells and motile sperm. That is why they are particularly well-suited to answer fundamental questions in biology," Reski says. After fusion of sperm and egg cell, a network of genes is activated. That leads to the development of an embryo which grows into a new living being. Until now it was unclear whether a central genetic switch for this gene activation exists.

In their latest publication the team describes the gene BELL1 as a master regulator for the formation of embryos and their development in Physcomitrella. After the researchers activated this gene in the plants by genetic engineering, embryos developed spontaneously on a specific cell type. These embryos grew to fully functional moss sporophytes. These spore capsules could even form spores, which grew into new moss plants. Thus, the team identified BELL1 as a master regulator for embryo development in mosses.

"Our results are important beyond mosses," Reski says. "On the one hand they can explain how algae developed into land plants and thus shaped our current ecosystems." Nir Ohad from Tel-Aviv explains, "Moreover, our results may help to modernize agriculture through the creation of genetically identical offspring from high-yielding crop plants. In seed plants such offsprings are formed by parthenogenesis or apomixis."