Recent Posts

Epigenetic silencing of a multifunctional plant stress regulator EIN2 (eLIFE)

EIN2 is a key regulator of the ethylene response and a protein with a complex function and regulation. Zander et al. have uncovered an interesting and complex mechanism by which its expression is regulated. Many genes are regulated through histone modifications, with the histone variant H2A.Z and the…

Jasmonate-related MYC transcription factors are functionally conserved in Marchantia polymorpha ($) (Plant Cell)

In recent years, studies in the model bryophyte Marchantia polymorpha have provided insights on how the Jasmonic Acid (JA) pathway works in early diverging land plants, starting from its biosynthesis (Yamamoto et al., 2015; Koeduka et al., 2015), followed by perception (Monte et al, 2018) and co-repressor…

A positive feedback loop of LHW-TMO5 and local auxin biosynthesis in vascular development ($) (Plant Cell Physiol)

Proper development of root vascular tissue is necessary for plant growth, as these tissues are responsible for nutrient and water uptake. Multiple key players including transcriptional factors (TF) and hormones are involved in vascular development. In this paper Ohashi-Ito et al. have identified a feedback…

A KNOX-cytokinin regulatory module predates the origin of indeterminacy (Curr. Biol.)

In vascular plants, new organs (e.g., leaves) are produced continuously from the shoot meristem, a process coined indeterminacy. The sister lineage of vascular plants, bryophytes, develop differently, ending with the formation of a determinate spore-bearing shoot (sporangium). The genetic underpinning…

Cytokinin functions as an asymmetric and anti-gravitropic signal in lateral roots (Nature Comms)

Lateral roots help plants to explore the soil and environmental conditions. Waidmann et al. took advantage of natural variants to understand lateral growth angle by analyzing gravitropic set point angle (GSA). Using Col-0 as a reference, lines that over- or under-respond (steeper or shallower root angle)…

ABCB21 regulates auxin levels in cotyledons, pericycle and leaves (Frontiers Plant Science)

Auxin activity is maintained through regulated biosynthesis, metabolism and transport. In this paper Jenness et al. characterized the physiological significance of a known IAA transporter, ABCB21 (ATP BINDING CASSETTE TRANSPORTER subfamily B member 21) in Arabidopsis. ABCB21 transports shoot derived…

Pinstatic acid promoters auxin transport by inhibiting PIN internalization (Plant Physiol)

Auxin transport regulated by directional transporters such as PIN (PIN-FORMED) proteins ensures maintenance of proper auxin levels for growth and development. Plants modulate auxin flow by regulating the localization of PIN through exocytosis and endocytosis allowing recycling of PIN protein within a…

Auxin-mediated statolith production for root gravitropism (New Phytol)

Plants have evolved the ability to perceive and respond to gravity, one of the most persistent external cues. This response process, termed gravitropism, has been extensively studied for its importance in plant development and its potential to improve agronomic traits of crops. The gravitropic response…

β-cyclocitral, a novel regulator of root growth ($) (PNAS)

Root growth and branching have essential roles in nutrient and water uptake, and are common targets in crop improvement. Dickinson et al. looked for novel apocarotenoids involved in root development and found that dihydroactinidiolide (DHAD) and β-cyclocitral increase lateral root (LR) branching in…