Plant development requires stringent controls between cell proliferation and cell differentiation. Proliferation is positively regulated by cyclin dependent kinases (CDKs). Acting in opposition to CDKs are CDK inhibitors (CKIs). The first tobacco CKI (NtKIS1a) identified was shown to inhibit in vitro the kinase activity of CDK/cyclin complexes and to interact with CDK and D-cyclins. However, th...

Citation: Manzano AI, Herranz R, Manzano A, van Loon JJWA and Medina FJ (2016) Early Effects of Altered Gravity Environments on Plant Cell Growth and Cell Proliferation: Characterization of Morphofunctional Nucleolar Types in an Arabidopsis Cell Culture System. Front. Astron. Space Sci. 3:2. doi: 10.3389/fspas.2016.00002 Early Effects of Altered Gravity Environments on Plant Cell Growth and Cel...

Previous reports have demonstrated that extracts of the plant Uncaria tomentosa inhibit tumor cell proliferation and inflammatory responses. We have confirmed that C-Med 100, a hot water extract of this plant, inhibits tumor cell proliferation albeit with variable efficiency. We extend these findings by showing that this extract also inhibits proliferation of normal mouse T and B lymphocytes an...

Hypericum perforatum L. (St. Johns’ wort) is the most commercially important species of the genus Hypericum and contains a wide range of components including naphthodianthrones, phloroglucinols, tannins, xanthones, phenolic acids and essential oil. In order to establish an efficient protocol for regeneration, the effects of explant type and plant growth regulators on direct and indirect shoot r...

Since plant cells cannot move relative to each other, plant organogenesis mainly depends on the strict coordination of cell growth and proliferation. Recent work suggests that this implies a subtle combination of biochemical and physical interactions between neighboring cells.

During the last 35 years of studies of Azospirillum–plant interaction, over 20 proposals were suggested for the mechanism of action by which Azospirillum spp., the most intensively studied plant growth-promoting bacteria, enhances plant growth. The proposals include a single phytohormone activity, multiple phytohormones, nitrogen fixation, assortments of small-sized molecules and enzymes, enhan...

tissue culture methods provide tools to supplement traditional methods for collection, propagation and preservation of endangered plant species. in this study, in vitro propagation of diaphanoptera khorasanica rech.f., a rare and threatened plant species with limited distribution range and population was investigated. this species has a potential as an ornamental plant. single node explants wer...