Brassinosteroids application induces phosphatidic acid production and modify antioxidant enzymes activity in tobacco in calcium-dependent manner.

Brassinosteroids (BRs) are steroid hormones regulating various aspects of plant metabolism, including growth, development and stress responses. However, little is known about the mechanism of their impact on antioxidant systems and phospholipid turnover. Using tobacco plants overexpressing H/Cavacuolar Arabidopsis antiporter CAX1, we showed the role of Ca ion balance in the reactive oxygen species production and rapid phosphatidic acid accumulation induced by exogenous BR.

Molecular mechanisms of gravity perception and signal transduction in plants.

Gravity is one of the environmental cues that direct plant growth and development. Recent investigations of different gravity signalling pathways have added complexity to how we think gravity is perceived. Particular cells within specific organs or tissues perceive gravity stimulus.