Plant Physiology: On The Inside

Auxin regulates many aspects of growth and development in land plants, but the origin and evolution of auxin signaling and response mechanisms remain largely unknown. Genome analyses of the moss Physcomitrella patens revealed the presence of the principal gene families involved in auxin homeostasis and…

Root hairs are long tubular extensions of root epidermal cells that greatly increase the root surface area and thereby assist in water and nutrient absorption. Root hairs are found in nearly all vascular plants, including angiosperms, gymnosperms, and lycophytes, and they exhibit similar cellular features,…

The waxy cuticle, a key barrier to desiccation and pathogen entry, is a dynamic structure, the composition, area, permeability and thickness of which can change in response to environmental conditions.  For example, water deficit in Arabidopsis (Arabidopsis thaliana) triggers an increase in the accumulation…

Methionine is a nutritionally essential sulfur-containing amino acid found at low levels in plants and in their seeds. It often limits the nutritional value of crop plants as a source of dietary protein for humans and animals.  In plants, methionine plays key roles in protein synthesis and mRNA translation,…

Growth inhibition is one of the most consistent plant responses to Ultraviolet-B (UV-B) exposure; this radiation, both as part of the solar spectrum in the field and from UV-B lamps in controlled environments. In this work, Fina et al. (10.​1104/​pp.​17.​00365) demonstrate that the UV-B levels…

Vitamin B6 is synthesized de novo in plants, fungi, archeae, and most eubacteria, but not in animals, including humans, which have to obtain it from dietary sources. Vitamin B6 is an essential cofactor for a range of biochemical reactions and a potent antioxidant. In plants, it plays important roles…

Plant photosynthesis generally increases with irradiance until light saturation occurs. The directional quality of light, however, can affect its penetration and absorption within a leaf. For example, increasing the angle of incidence (from perpendicular) at which light intersects the leaf surface decreases…

Lignin, a ubiquitous phenylpropanoid polymer found in the cell walls of vascular plants, is derived primarily from oxidative couplings of monolignols (p-hydroxycinnamyl alcohols). By filling up spaces between cell wall polysaccharides (cellulose and hemicelluloses), lignin confers increased mechanical…