Negative regulation of a still to be discovered hormone

Up till now the majority of the studies focussed on the response to karrakin(-like) and how plants regulate this. But hormone response is often held in check by negative feedback loops. Now a new study by a group of international researchers focused on this negative feedback loop.

Pumping up cells

Plants lift up their leaves in crowded environments, so they can capture more light. While researchers know a lot of how plants do this, what causes cells to grow, which is needed for this response, is unclear. Now a group of international researchers show that the potassium channel AKT5 pumps in K+ ions into the cell, subsequently promoting the cell to expand.

Linking defence responses

Upon wounding a Ca2+ signal travels from the wound through the plant. In each cell the signal passes through the defence response gets activated. Now a new study from German researchers shows that two plastid located ion channels form a missing link in how Ca2+ activates the biosynthesis of jasmonic acid, one of the plant hormones that coordinate the defence response.