Trichomes carbon

In a micro-autography study, field collected Rhizosolenia-Richelia symbioses were incubated with C-labeUed bi-carbonate. Higher density of silver grains localized on the symbiotic Richelia trichomes than on the host Rhizosolenia filaments, suggesting that the Richelia were actively photosynthesizing and the host diatom were inactive (Weare et al., 1974). An equally plausible explanation for less silver grains on the Rhizosolenia host is that some of the fixed and labeled photosynthetic products were transferred to the host from the symbiont. Similar scenarios of carbon, and nitrogen transfer, are well documented in terrestrial... 

Undecanone, the 11-carbon methyl ketone, also occurs in the type VI trichomes of PI 134417 and is active against zea and several other pest species (59-60), It is less acutely toxic than 2-tridecanone against neonate zea (59) and is less abundant (x = 1.1 ug vs. 6.2 ug/trichome tip for 2-tridecanone in PI 134417), However, in combination, 2-tridecanone and 2-undecanone are... 

Essential oils are secondary metabolites produced in the plants as volatile aromatic principles. They are colorless and rarely colored and soluble in organic solvents. It is fotmd in all part of the plants and is stored in epidermal cells, trichomes, secretory cells, canals, and cavities. They are extracted by the use of liquid carbon dioxide or microwaves, expression and mainly steam or hydrodistillation process. Due to their biological, nutritive, and pharmaceutical properties, they are more attractive alternatives to synthetic chemical products to protect the equilibrium. 

The discovery of a novel pathway for biosynthesis of medium and short chain fatty acids in plants (a-keto acid elongation pathway, 1) raises the possibility (however unlikely) that medium-chain fatty acids (mcFAs) of certain oil seeds producing them may be derived by this pathway. Alternatively, these may be formed after release of elongating fatty acid chains from fatty acid synthase mediated biosynthesis (FAS) by specific medium chain thioesterases [2, 3,4]. Thus far the aKAE pathway is only known to occur in trichome glands of plants in the family Solanaceae. In the aKAE pathway, iso-, anteiso- or straight-chain keto acid products of branched-chain amino acid metabolism are elongated by one carbon (via acetate) per cycle. The final step is predicted to be oxidative decarboxylation to yield CoA activated acids. The mechanism that determines the chain length of aKAE products is not understood [1]. 

Sarret, G. Harada, E. Choi, Y. E. Isaure, M. P Geoffroy, N. Fakra, S. Marcus, M. A. Birschwilks, M. Clemens, S. Manceau, A. Trichomes of tobacco excrete zinc as zinc-substituted calcium carbonate and other zinc-containing compounds. Plant Physiol. 2006,141, 1021-1034. 

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