Internodes of grass stems function in mechanical support, transport, and, in some species, are a major sink organ for carbon in the form of cell wall polymers. This study reports cell wall composition, proteomic, and metabolite analyses of the rice elongating internode. Cellulose, lignin, and xylose increase as a percentage of cell wall material along eight segments of the second rice internode...

We investigated the effects of photon fluence rate on internode elongation in fully de-etiolated plants growing under sunlight. Our goal was to find out whether perception by the stetns of fluence rate changes related to canopy density tnay be involved in the modulation of internode growth in canopies formed by plants of sitnilar stature (e.g. crop stands). Using Datuta ferox L. and Sinapis alb...

The phytohormone gibberellin (GA) plays a key role in promoting stem elongation in plants. Previous studies show that GA activates its signaling pathway by inducing rapid degradation of DELLA proteins, GA signaling repressors. Using an activation-tagging screen in a reduced-GA mutant ga1-6 background, we identified AtERF11 to be a novel positive regulator of both GA biosynthesis and GA signalin...

An attempt has been made to uncouple the effects of the two primary components of shade light, a reduced red to far-red (R/FR) ratio and low photosynthetically active radiation (PAR), on the elongation of the youngest internode of sunflower (Helianthus annuus) seedlings. Maximal internode growth (length and biomass) was induced by a shade light having a reduced R/FR ratio (0.85) under the low P...

The rate of acidification of media by Avena stem segments was studied with a titrimeter. GA(3) increased this rate by an average of 17% if supplied to the segments 90 min prior to measurement. GA(3) inhibited the rate by 15% if supplied 10 min prior to measurement. After 90 min incubation, stimulation of elongation had started; at 10 min, GA(3) had not yet started to stimulate elongation in the...

Light quality evaluations were conducted on yam (Dioscorea alata L. cultivar 'Oriental' ) plantlets to determine the potential usefulness of manipulation of the light environment in regulating growth. Eight-week old, in vitro grown yam plantlets were transferred to pots and treated in vivo with end-ofday (EOD) red (R) or far-red (FR) light. Also, nodal segments ofD. alata plantlets were culture...

From a screen of M2 seedlings derived from gamma-mutagenesis of seeds doubly null for phytochromes phyA and phyB, we isolated a mutant lacking phyE. The PHYE gene of the selected mutant, phyE-1, was found to contain a 1-bp deletion at a position equivalent to codon 726, which is predicted to result in a premature stop at codon 739. Immunoblot analysis showed that the phyE protein was undetectab...