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Gao, X.; Stumpe, M.; Feussner, I.; Kolomiets, M.; A novel plastidial lipoxygenase of maize (Zea mays) ZmLOX6 encodes for a fatty acid hydroperoxide lyase and is uniquely regulated by phytohormones and pathogen infection Planta 227, 491-503, (2008) DOI: 10.1007/s00425-007-0634-8
Lipoxygenases (LOXs) are members of a large enzyme family that catalyze oxygenation of free polyunsaturated fatty acids into diverse hydroperoxide compounds, collectively called oxylipins. Although LOXs have been well studied in dicot species, reports of the genes encoding these enzymes are scarce for monocots, especially maize. Herein, we reported the cloning, characterization and molecular functional analysis of a novel maize LOX gene, ZmLOX6. The ZmLOX6 nucleotide sequence encodes a deduced translation product of 892 amino acids. Phylogenetic analysis showed that ZmLOX6 is distantly related to previously reported 9- or 13-LOXs from maize and other plant species, including rice and Arabidopsis. Although sequence prediction suggested cytoplasmic localization of this protein, ZmLOX6 protein has been reportedly isolated from mesophyll cell chloroplasts, emphasizing the unique features of this protein. Plastidial localization was confirmed by chloroplast uptake experiments with the in vitro translated protein. Analysis of recombinant protein revealed that ZmLOX6 has lost fatty acid hydroperoxide forming activity but 13-LOX-derived fatty acid hydroperoxides were cleaved into odd-chain ω-oxo fatty acids and as yet not identified C5-compound. In line with its reported abundance in mesophyll cells, ZmLOX6 was predominantly expressed in leaf tissue. Northern blot analysis demonstrated that ZmLOX6 was induced by jasmonic acid, but repressed by abscisic acid, salicylic acid and ethylene and was not responsive to wounding or insects. Further, this gene was strongly induced by the fungal pathogen Cochliobolus carbonum during compatible interactions, suggesting that ZmLOX6 may contribute to susceptibility to this pathogen. The potential involvement of ZmLOX6 in maize interactions with pathogens is discussed.
Delker, C.; Raschke, A.; Quint, M.; Auxin dynamics: the dazzling complexity of a small molecule’s message Planta 227, 929-941, (2008) DOI: 10.1007/s00425-008-0710-8
The phytohormone auxin is a potent regulator of plant development. Since its discovery in the beginning of the twentieth century many aspects of auxin biology have been extensively studied, ranging from biosynthesis and metabolism to the elucidation of molecular components of downstream signaling. With the identification of the F-box protein TIR1 as an auxin receptor a major breakthrough in understanding auxin signaling has been achieved and recent modeling approaches have shed light on the putative mechanisms underlying the establishment of auxin gradients and maxima essential for many auxin-regulated processes. Here, we review these and other recent advances in unraveling the entanglement of biosynthesis, polar transport and cellular signaling events that allow small auxinic molecules to facilitate their complex regulatory action.