Recent Posts

Developmental Timing is Everything: TZP and Phytochrome Signaling

Although they lack eyes, plants can differentiate between colors with a full complement of photoreceptors. Phytochromes (phys) are such photoreceptors dedicated to the visible light spectrum ranging from red light (600-700 nm) to far-red light (700-750 nm). phys are some of the most studied genes and…

Update: Phytochrome, Carbon Sensing, Metabolism, and Plant Growth Plasticity

By Johanna Krahmer, Ashwin Ganpudi, Ammad Abbas, Andrés Romanowski, and Karen J. Halliday Plants continuously monitor fluctuations in their environment and actively adjust their metabolism to cope with variations in light and carbon resource availability. However, the links between photoreceptor signaling…

EIN3 and PIF3 form an interdependent module that represses chloroplast development in buried seedlings ($) (Plant Cell)

Photosynthesis is the fundamental process for plants to produce food. Beneath the soil there is an impairment of chloroplast development. In this article, Liu et al. identified that mechanical pressure works through the ethylene-responsive transcription factor EIN3, while light signaling is mediated…

Supression of phyB dark reversion by PCH1 and PCHL (Nature Comms.)

Nature Comms. Phytochromes can exist in two states: an inactive state Pr and an active state Pfr. They convert into each other by light absorption. They can also revert to the inactive state by a light-independent thermal relaxation process called dark reversion. Phytochrome B is the primary receptor…

Phytochrome, metabolism and growth plasticity

Phytochromes are plant photoreceptors that can sense red and far-red light, as-well-as the ratio of these light qualities.  This review examines the relationship between phytochrome signalling and carbon metabolism.  Krahmer et al. assess the influence of phytochrome signalling on the synthesis of…

EIN3 and PIF3 interdependently repress chloroplast development in buried seedlings

During embryogenesis, plastids arrest their differentiation as etioplasts (characterized by the distinctive prolamellar bodies, PLBs), and remain poised  to complete their differentiation into functioning chloroplasts upon exposure to light. Liu et al. explored the factors that interact to effect this…

Light controls protein localization through phytochrome-mediated alternative promoter selection ($)

Previous studies have shown that some genes use multiple promoters, but the extent to which this occurs has not been fully resolved. Ushijima et al. showed widespread phytochrome-mediated differential promoter use in response to light. They identified more than 2000 genes with light-dependent alternative…