title: Evolutionary and expression study of the aldehyde dehydrogenase (ALDH) gene superfamily in rice (Oryza sativa).
abstract: Aldehyde dehydrogenase (ALDH) superfamily represents a group of NAD(P)(+)-dependent enzymes that catalyze the oxidation of endogenous and exogenous aldehydes to the corresponding carboxylic acids. A total of twenty ALDH genes were identified in the rice genome. They were grouped into 10 distinct families based on protein sequence identity. The whole genome duplication (WGD) predating the divergence of cereals and tandem duplications represent the major mechanism for this superfamily expansion. Intron loss was found to accompany the recent evolution of four rice ALDH families. Quantitative RT-PCR analysis revealed that some of the rice ALDH genes were expressed in an organ-specific manner. Microarray data analysis indicated that expression of most duplicated rice ALDH genes showed high tissue specificities. Diverse expression patterns for duplicated genes were evaluated using both microarray and MPSS data. Expression levels of some ALDH genes were up-regulated by drought and high salinity stresses and the phytohormone abscisic acid (ABA) application, indicating that the products of these genes were potentially involved in rice osmotic stress adaptation. These results suggested that the specific rice ALDH genes might be potentially useful in rice genetic improvement.
authors.affiliation: National Center for Gene Research and Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 500 Caobao Road, Shanghai 200233, PR China.
authors.forename: Chenxi
authors.initials: C
authors.lastname: Gao
authors.forename: Bin
authors.initials: B
authors.lastname: Han
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D000444:Aldehyde Dehydrogenase / Q000235:genetics*; D019143:Evolution, Molecular; D020440:Gene Duplication / Q000187:drug effects; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D007438:Introns / Q000235:genetics; D005810:Multigene Family / Q000235:genetics*; D009928:Organ Specificity / Q000187:drug effects / Q000235:genetics; D012275:Oryza / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics*; D010802:Phylogeny; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics
chemical_list: D000040:Abscisic Acid; D000444:Aldehyde Dehydrogenase