The abundance of plant nucleolin mRNA is regulated during de-etiolation by phytochrome. A close correlation between the mRNA abundance of nucleolin and mitosis has also been previously reported. These results raised the question of whether the effects of light on nucleolin mRNA expression were a consequence of light effects on mitosis. To test this we compared the kinetics of light-mediated inc...

BACKGROUND AND AIMS Etiolation symptoms and the greening process are usually studied on dark-germinated seedlings and this raises the question--can these results be generalized for plants growing under field conditions? This work examines various aspects of the plastid differentiation under the covering of the achene wall, which often remains attached to the cotyledons of sunflower (Helianthus ...

The protocorm-like bodies (PLBs) of Cymbidium hookerianum were used as the explants, effects different hormones and hormone concentrations on induction etiolation stems, subsequent regeneration artificial seeds production conservation using stems studied. results showed that most efficient induced by PLBs was obtained adding 0.1 mg/L NAA 6-BA. cultivated medium containing 2.0/0.1 NAA/6-BA highe...

Plant circadian clock controls a wide variety of physiological and developmental events, which include the short-days (SDs)-specific promotion of the elongation of hypocotyls during de-etiolation and also the elongation of petioles during vegetative growth. In A. thaliana, the PIF4 gene encoding a phytochrome-interacting basic helix-loop-helix (bHLH) transcription factor plays crucial roles in ...

2 I. INTRODUCTION II. PHOTOSYSTEM 0: THE MECHANISM 1. Fluctuating Light 2. Formation of Metastable Dipoles (a) Light-induced RC Dipoles and their Metastability (b) Distance Traversed within the RC by the Excited or Separated Electron (c) Number of Separated Electrons per RC (d) Contrast 3. The Photosynthetic Dipole Potential (a) The Dipole Potential (b) Surface Area per RC (c) Relative Dielectr...