A key determinant of overall morphogenesis in flowering plants such as Arabidopsis thaliana is the shoot apical meristem (growing tip of a shoot). Gene r gulation networks can be used to model this system. We exhibit a very preliminary two-dimensional model including gene regulation and intercellular signaling, but omitting cell division ana' dynamical geometry. The model can be hnined to have ...

In order to improve the shoot proliferation rate of ‘Dwarf Cavendish’ banana shoot tip cultures, polyethylene glycol (PEG6000) was employed at concentrations of 2, 4, and 6% (w/v). The medium without PEG was considered as negative control. An increasing of shoot proliferation was achieved in MS medium containing 2% PEG. Furthermore, application of 2% PEG significantly increased the shoot dry we...

Stem cell maintenance and daughter cell differentiation is essential for root and shoot development. Genetic and physical interaction of the receptor-like kinases ACR4 and CLV1 bring a new player to the field of distal stem cell control in the primary root tip.

Three gene families have been identified which interact to polarize plant lateral organs. The results suggest that organ polarity is initially determined by a signal from the shoot tip which specifies adaxial organ identity and results in repression of abaxial identity, thereby aligning the polarity of organs with the stem.

Abstract Argylia radiata is an herbaceous perennial plant native to northern Chile and a representative species of the “Blooming Desert”. Due its showy flowers other morphological characteristics, A. has great ornamental potential. In earlier work, deep morpho-anatomical description was made, but micropropagation protocols, which could be used for commercial purposes, are not known. Previous as...

The aerial structure of higher plants is generated dynamically throughout the life cycle through the activity of stem cells that are located at the growing shoot tip, the apical meristem. The stem cells continuously divide to renew themselves and provide cells for leaf, stem and flower formation. Stem cell maintenance is governed by intercellular communication between the apical stem cells and ...

Polyploid plantlets, including triploid, tetraploid, and mixoploid, were induced from the European pear (Pyrus communis L.) cultivar ‘Fertility’ by in vitro colchicine treatment of leaf explants. The leaf explants were incubated in 0.4% (w/v) colchicine for 24, 48, or 72 h, then transferred to adventitious shoot-induction medium. Regenerated shoots were pre-selected according to their morpholog...