chlorophyll-a and geraniol

Oligomers derived through irradiation of marine polysaccharides have generated a lot of interest of plant biologists as the application of these molecules has yielded positive results regarding various plant processes. To comprehend the previously established growth-promoting activity of irradiated chitosan (ICH) and to gain insight of the structure-property relationship, gamma rays induced structural changes were analyzed using techniques such as Fourier Transform Infrared (FT-IR) spectroscopy, Ultraviolet-visible (UV-Vis) spectroscopy,

Topics: Acyclic Monoterpenes; Aldehydes; Carotenoids; Chitosan; Chlorophyll; Cymbopogon; Gamma Rays; Oils, Volatile; Photosynthesis; Plant Growth Regulators; Plant Leaves

Recombinant tomato terpene synthases, TPS5/37/39, catalyze the formation of linalool or nerolidol in vitro. However, little is known about their actual biological activities in tomato plants, especially in their fruits. Here, when all three TPSs were induced in tomato fruits by a chemical elicitor, geraniol, a significant linalool peak was detected in fruit tissues but not in control fruits. Considering the compartments of these TPS proteins and available substrates, the linalool peak induced by geraniol might be attributed to TPS5 and TPS37, both of them putatively localized in the plastids where high levels of monoterpene substrate geranyl diphosphate exist. In addition, application of geraniol also triggered jasmonic acid (JA)-related defense genes suggesting that the inducible TPSs might be correlated with JA-signaled defense responses.

Topics: Acyclic Monoterpenes; Alkyl and Aryl Transferases; Chlorophyll; Cyclopentanes; Fluorescence; Fruit; Gene Expression Regulation, Plant; Monoterpenes; Oxylipins; Phylogeny; Plant Proteins; Solanum lycopersicum; Terpenes; Volatile Organic Compounds

The time course of the different esters of chlorophyllide (Chlide) during the formation of chlorophyll a (Chl) in embryonic bean leaves containing proplastids was investigated by HPLC. After the reduction of photoactive Pchlide (Pchlide) to Chlide, three intermediates, i.e. Chlide geranylgeraniol, Chlide dihydrogeranylgeraniol and Chlide tetrahydrogeranylgeraniol were detected before the formation of Chlide phytol, i.e. authentic Chl. The transformation of Chlide to Chl was found to be much faster in leaves containing proplastids than in etiolated leaves with etioplasts.

Topics: Acyclic Monoterpenes; Chlorophyll; Chlorophyllides; Chromatography, High Pressure Liquid; Darkness; Esterification; Esters; Fabaceae; Light; Phytol; Plant Leaves; Plants, Medicinal; Plastids; Seeds; Temperature; Terpenes