#Stealing information from host plants: How the parasitic dodder plant flowers

Using biochemical tools, the team further demonstrated that when the host expresses FT signals, the flowering-inducer FT can travel into C. australis and activate the flowering program of C. australis.
“The dodder does not flower autonomously; instead, when the host plant produces the FT signal protein to activate flowering, the host-produced FT protein is transported into the dodder, thereby activating dodder flowering,” said WU.
This study reveals that by eavesdropping on host FT flowering signals, the dodder can synchronize its flowering with its hosts.

This behavior is important, as it may enable dodders to parasitize diverse host plants: If the dodder has a fixed flowering time, and it is much later than the host, then when the host flowers, the nutrient level of the host plant usually drops because of seed development, and the host may even die before the dodder flowers.
On the other hand, if the dodder flowers much earlier than the host, dodder growth will end prematurely, and in this scenario, the dodder does not make as many seeds as the dodder that flowers at a time similar to the host.
This study sheds important light on the physiology, ecology, and evolution of dodders and may provide new strategies for biocontrol of parasitic weeds in agriculture and forestry.