title: The genes for gibberellin biosynthesis in wheat.
abstract: The gibberellin biosynthesis pathway is well defined in Arabidopsis and features seven key enzymes including ent-copalyl diphosphate synthase (CPS), ent-kaurene synthase (KS), ent-kaurene oxidase (KO), ent-kaurenoic acid oxidase (KAO), GA 20-oxidase, GA 3-oxidase, and GA 2-oxidase. The Arabidopsis genes were used to identify their counterparts in wheat and the TaCPS, TaKS, TaKO, and TaKAO genes were cloned from Chinese Spring wheat. In order to determine their chromosome locations, expression patterns and feedback regulations, three TaCPS genes, three TaKS genes, three TaKO genes, and three TaKAO genes were cloned from Chinese Spring wheat. They are mainly located on chromosomes 7A, 7B, 7D and 2A, 2B and 2D. The expression patterns of TaCPS, TaKS, TaKO, and TaKAO genes in wheat leaves, young spikes, peduncles, the third and forth internodes were investigated using quantitative PCR. The results showed that all the genes were constitutively expressed in wheat, but their relative expression levels varied in different tissues. They were mainly transcribed in stems, secondly in leaves and spikes, and the least in peduncles. Feedback regulation of the TaCPS, TaKS, TaKO, and TaKAO genes was not evident. These results indicate that all the genes and their homologs may play important roles in the developmental processes of wheat, but each of the homologs may function differently in different tissues or during different developmental stages.
authors.affiliation: The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Huang
authors.forename: Wenlong
authors.initials: W
authors.lastname: Yang
authors.forename: Zhong
authors.initials: Z
authors.lastname: Pei
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Guo
authors.forename: Dongcheng
authors.initials: D
authors.lastname: Liu
authors.forename: Jiazhu
authors.initials: J
authors.lastname: Sun
authors.forename: Aimin
authors.initials: A
authors.lastname: Zhang
mesh_terms: D017360:Arabidopsis / Q000235:genetics; D001483:Base Sequence; D053898:Biosynthetic Pathways; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D005875:Gibberellins / Q000096:biosynthesis*; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic; D014908:Triticum / Q000235:genetics* / Q000378:metabolism
chemical_list: D005875:Gibberellins; D010940:Plant Proteins