G protein-coupled receptors (GPCRs) at the cell surface activate heterotrimeric G proteins by inducing the G protein alpha (Galpha) subunit to exchange guanosine diphosphate for guanosine triphosphate. Regulators of G protein signaling (RGS) proteins accelerate the deactivation of Galpha subunits to reduce GPCR signaling. Here we identified an RGS protein (AtRGS1) in Arabidopsis that has a pred...

Gravity is a key factor for life on Earth. It is the only environmental factor that has remained constant throughout evolution, and plants use it to modulate important physiological activities; gravity removal or alteration produces substantial changes in essential functions. For root gravitropism, gravity is sensed in specialised cells, which are capable of detecting magnitudes of the g vector...

Mesophyll cell protoplasts were isolated from potato (Solanum tuberosum L. cv. Russet Burbank) leaves and induced to proliferate in culture. Protoplast division was observed only among preparations isolated from plants previously conditioned under short periods of low intensity illumination. Sustained growth and development of protoplast-derived calli (p-calli) occurred when they were maintaine...

objectives : platelet preparations are commonly used to enhance bone and soft tissue regeneration. considering the existing controversies on the efficacy of platelet products for tissue regeneration, more in vitro studies are required. the aim of the present study was to compare the in vitro effects of plasma rich in growth factors (prgf) and platelet-rich fibrin (prf) on proliferation and viab...

This paper investigates whether a fusion power plant could be designed to be passively proliferation-proof. Even low neutron production rates enable fissile-fuel breeding, so such a fusion reactor must burn neutron-lean fuels. To burn these fuels economically requires a highpower-density fusion concept, and a D-He field-reversed configuration will be analyzed here. The paper discusses physics a...

In contrast with other cells generated by the root apical meristem in Arabidopsis, pericycle cells adjacent to the protoxylem poles of the vascular cylinder continue to cycle without interruption during passage through the elongation and differentiation zones. However, only some of the dividing pericycle cells are committed to the asymmetric, formative divisions that give rise to lateral root p...

Ethylene is an important phytohormone in the regulation of plant growth, development, and stress response throughout the lifecycle. Previously, we discovered that a subfamily II ethylene receptor tobacco (Nicotiana tabacum) Histidine Kinase1 (NTHK1) promotes seedling growth. Here, we identified an NTHK1-interacting protein translationally controlled tumor protein (NtTCTP) by the yeast (Saccharo...

A rapid in vitro propagation system has been established from mature shoot tip and nodal segments of ahighly valuable medicinal plant Alternanthera sessilis (L.). The explants were cultured on Murashige andSkoog’s medium augmented with different concentrations and combinations of plant growth regulators forshoot bud initiation and multiplications. For shoot tip, highest freque...

in vitro methods provide a variety of tools to supplement traditional methods for collection, propagation and preservation of endangered plant species. in this study, an efficient protocol was developed for in vitro propagation of colutea gifana, a rare and endangered plant species with limited reproductive capacity that grows in a narrow area of iran. single node explants were used for a serie...