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Fig. 4 | BMC Genomics

Fig. 4

From: A high-density genetic map and QTL mapping of leaf traits and glucosinolates in Barbarea vulgaris

Fig. 4

Glucosinolates in Barbarea vulgaris leaves as detected in this investigation, with suggested biosynthetic relationships. a. General glucosinolate structure, using gluconasturtiin (NAS, 2-phenylethylglucosinolate) as example. b. Biosynthetic relationships of phenylalanine-derived glucosinolates. The general glucosinolate biosynthesis leads to NAS, which is hydroxylated in either of two stereochemical configurations, yielding either BAR (glucobarbarin, (2S)-2-hydroxy-2-phenylethylGSL) or EBAR (epiglucobarbarin, (2R)-2-hydroxy-2-phenylethylglucosinolate). This hydroxylation was previously anticipated to be carried out by either of two gene products, SHO and RHO. Results of this work suggest involvement of several complementing gene products, provisionally named with suffixes a and b. A further glucosinolate in the P-type is p-hydroxy EBAR (p-hydroxyepiglucobarbarin or (2R)-2-hydroxy-2-(4-hydroxyphenyl)ethylglucosinolate. c. Biosynthetic relationships of tryptophan-derived glucosinolates. The general indole glucosinolate biosynthesis leads to IM (glucobrassicin, indol-3-ylmethylglucosinolate). A homolog of A. thaliana CYP81F is expected to lead to the 4-hydroxy derivative 4hIM [38], which is probably taken to the 4-methoxy derivative 4mIM by a homolog of A. thaliana IGMT [60]. In all structures except the upper complete structure, the constant glucosinolate backbone is indicated as GSL

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