Abstract
In angiosperms, NADPH: protochlorophyllide oxidoreductase (POR) catalyzes the photoreduction of protochlorophyllide (Pchlide) to chlorophyllide (Chlide), the only light-dependent step in chlorophyll biosynthesis. There is a wide variety of gene organization and light- and development-dependent regulatory mechanisms for the POR genes. In this study, a POR homologue, designated PjPORB, was isolated from Pseudosasa japonica cv. Akebonosuji, which is a cultivar of high ornamental value in landscape due to its unique green-white striped leaf phenotype. The full-length PjPORB cDNA was 1567 bp long with a 1185 bp ORF that encoded 394 amino acids. Multiple amino acid sequence alignment showed that the putative PjPORB shared a high similarity to POR homologues from other plant species, and that the cofactor (NADPH)-binding motif and active site motif in particular were highly conserved among all the PORs. Further, PjPORB was overexpressed in Arabidopsis thaliana; and the Pchlide contents of the genetically modified plants were reduced to a larger extent than that of wild type plants, thereby indicating its important role in Pchlide photoreduction. In real-time quantitative RT-PCR analysis, PjPORB was expressed at higher levels in leaf samples than in culms and roots, and showed a first increasing-then decreasing expression pattern during the development of white, stripe, and green leaf samples, thus indicating its essential role in leaf development. Although the mRNA levels for PjPORB did not differ considerably among white, stripe, and green leaf samples within the two almost same earlier developmental stages, its expression levels in the late leaf developmental stage fell into two distinct classes: high expression levels in strip and green leaf samples, and low expression levels in white leaf. Collectively, these expression data suggested that PjPORB may be involved in the leaf color variation for P. japonica cv. Akebonosuji.
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This work was supported by the grant from the National Natural Science Foundation of China (31170565, 31270645 and 31470615), the Program of Natural Science Foundation of Zhejiang Province (LR12C16001 and LY12C16002).
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Jiang, K., Zhou, M. Cloning and functional characterization of PjPORB, a member of the POR gene family in Pseudosasa japonica cv. Akebonosuji. Plant Growth Regul 79, 95–106 (2016). https://doi.org/10.1007/s10725-015-0115-1
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DOI: https://doi.org/10.1007/s10725-015-0115-1