The effects of flurprimidol and paclobutrazol, treatments as preplant bulb soaks on plant height, growth parameters other properties Narcissus tazetta L. grown in pots were investigated. Bulbs soaked at 0, 10, 20 mg L-1 or paclobutrazol 100, 200 before planting. gibberellin inhibitors the flower number, flowering time, life, leaf length quantitative measurements (specific area, area ratio, thic...

The isolation, crystallization, and partial identification of potato factor II, a stimulator from the chemically neutral fraction of potato extract, is described. The compound was originally found to stimulate elongation of dwarf peas grown under red light, a gibberellin bioassay. It melts between 137 degrees and 139 degrees . In paper chromatography it migrates to R(F) 0.62 in isopropyl alcoho...

The co-ordination of cell wall synthesis with plant cell expansion is an important topic of contemporary plant biology research. In studies of cell wall synthesis pathways, cellulose synthesis inhibitors are broadly used. It is demonstrated here that ancymidol, known as a plant growth retardant primarily affecting gibberellin biosynthesis, is also capable of inhibiting cellulose synthesis. Its ...

Plant development requires coordination among complex signaling networks to enhance the plant's adaptation to changing environments. DELLAs, transcription regulators originally identified as repressors of phytohormone gibberellin signaling, play a central role in integrating multiple signaling activities via direct protein interactions with key transcription factors. Here, we found that DELLA i...

Althouglh there have been many studies on effects of light on over-all elongation of various plant organs, relatively little is known concerning effects of light oni the pattern of elongation within a given organ. i.e., the relative contributions of various portions of the organ to the total elongation. In this study, intact wheat coleoptiles were marked with fildia ink to permit an investigati...

Five full-length cDNA encoding gibberellin 2-oxidases, VaGA2oxA1, VaGA2oxA2, VaGA2oxB1, VaGA2oxB2, and VaGA2oxB3, were cloned from etiolated adzuki bean (Vigna angularis cv. Dainagon) seedlings, and their enzymatic characteristics were examined using recombinant enzymes fused with glutathione S-transferase (GST). Recombinant VaGA2oxA1 (rVaGA2oxA1) and rVaGA2oxA2 showed 2beta-hydroxylation activ...

Abstract The growth-promoting hormone gibberellin (GA) regulates numerous developmental processes throughout the plant life cycle. It also affects response to biotic and abiotic stresses. GA metabolism signaling in tomato ( Solanum lycopersicum ) have been studied last three decades major components of pathways were characterized. These include biosynthesis catabolism enzymes components, such a...

Radioactive gibberellin A(5) ((3)H-GA(5)) was synthesized from gibberellic acid. When it was applied to dwarf peas grown in the dark, an average of 3% was converted to another acid gibberellin within 48 hours. The biological activity of the metabolite did not account for the response to applied GA(5). GA(5) is therefore assumed to be biologically active per se.(3)H-GA(5) did not appear to form ...

As the major mechanism of plant growth and morphogenesis, cell elongation is controlled by many hormonal and environmental signals. How these signals are coordinated at the molecular level to ensure coherent cellular responses remains unclear. In this study, we illustrate a molecular circuit that integrates all major growth-regulating signals, including auxin, brassinosteroid, gibberellin, ligh...