A gene, fdxP, was identified upstream of the rrnA gene in Caulobacter crescentus and shown to encode ferredoxin II (FdII) by insertional inactivation. FdII is homologous to a class of [2Fe-2S] ferredoxins typified by putidaredoxin. Furthermore, reconstitution assays demonstrated that FdII was able to promote p-hydroxybenzoate hydroxylase activity in ferredoxin-depleted extracts. Thus, biodegradation of p-hydroxybenzoate may be ferredoxin dependent in C. crescentus.
ABSTRACT. In this study, the full-length cDNA encoding allene oxide cyclase (AhAOC) was isolated from peanut (Arachis hypogaea L.). The deduced amino acid sequence of AhAOC showed high homology with other plant AOCs. The transcript of AhAOC was found to be abundantly expressed in roots. Expression analysis demonstrated that AhAOC was induced by abscisic acid, methyl-jasmonic acid, salicylic acid, salinity, polyethylene glycol, and cold stresses, particularly by high salinity. Overexpression of AhAOC in rice increased root elongation and plant height compared with expression in control plants and conferred tolerance against salinity. Thus, the AhAOC gene may play an important role in increasing the expression of transcription factors (MYB2 and OsONAC045) and functional genes (DREB1F and LEA3) in transgenic rice under salt stress as well as improve stress tolerance through the
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