Function and transcript analysis of gibberellin-biosynthetic enzymes in wheat

被引:111
作者
Appleford, NEJ
Evans, DJ
Lenton, JR
Gaskin, P
Croker, SJ
Devos, KM
Phillips, AL
Hedden, P [1 ]
机构
[1] Rothamsted Res, Harpenden AL5 2JN, Herts, England
[2] Univ Georgia, Athens, GA 30602 USA
基金
英国生物技术与生命科学研究理事会;
关键词
gibberellin; 20-oxidase; 3-oxidase; gene expression; gibberellin biosynthesis; wheat;
D O I
10.1007/s00425-005-0104-0
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The enzymes gibberellin (GA) 20-oxidase and 3-oxidase are major sites of regulation in GA biosynthesis. We have characterised one member of each of the gene families encoding these enzymes that are highly expressed in elongating stems and in developing and germinating grains of wheat and are therefore likely to have prominent developmental roles in these tissues. We mapped the three homoeologues of the GA 20-oxidase gene TaGA20ox1 to chromosomes 5BL, 5DL and 4AL. TaGA20ox1 is expressed mainly in the nodes and ears of the elongating stem, and also in developing and germinating embryos. Expression in the nodes, ears and germinating embryos is predominantly from the A and D genomes. Each homoeologous cDNA encodes a functional enzyme that catalyses the multi-step conversions of GA(12)-GA(9), and GA(53)-GA(20). Time course and enzyme kinetic studies indicate that the initial oxidation steps from GA(12) and GA(53) to the free alcohol forms of GA(15) and GA(44), respectively, occur rapidly but that subsequent steps occur more slowly. The intermediate GA(19) has an especially low affinity for the enzyme, consistent with its accumulation in wheat tissues. The three homoeologous cDNAs for the 3-oxidase gene TaGA3ox2 encode functional enzymes, one of which was shown to possess low levels of 2 beta-hydroxylase, 2,3-desaturase, 2,3-epoxidase and even 13-hydroxylase activities in addition to 3 beta-hydroxylase activity. In contrast to TaGA20ox1, TaGA3ox2 is expressed in internodes, as well as nodes and the ear of the elongating stem. It is also highly expressed in developing and germinated embryos.
引用
收藏
页码:568 / 582
页数:15
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