Genetic structure and regulation of isoprene synthase in Poplar (Populus spp.)

Vickers, Claudia E. and Possell, Malcolm and Hewitt, C. N. and Mullineaux, Philip M. (2010) Genetic structure and regulation of isoprene synthase in Poplar (Populus spp.). Plant Molecular Biology, 73 (4-5). pp. 547-558. ISSN 0167-4412

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Abstract

Isoprene is a volatile 5-carbon hydrocarbon derived from the chloroplastic methylerythritol 2-C-methyl-d-erythritol 4-phosphate isoprenoid pathway. In plants, isoprene emission is controlled by the enzyme isoprene synthase; however, there is still relatively little known about the genetics and regulation of this enzyme. Isoprene synthase gene structure was analysed in three poplar species. It was found that genes encoding stromal isoprene synthase exist as a small gene family, the members of which encode virtually identical proteins and are differentially regulated. Accumulation of isoprene synthase protein is developmentally regulated, but does not differ between sun and shade leaves and does not increase when heat stress is applied. Our data suggest that, in mature leaves, isoprene emission rates are primarily determined by substrate (dimethylallyl diphosphate, DMADP) availability. In immature leaves, where isoprene synthase levels are variable, emission levels are also influenced by the amount of isoprene synthase protein. No thylakoid isoforms could be identified in Populus alba or in Salix babylonica. Together, these data show that control of isoprene emission at the genetic level is far more complicated than previously assumed.

Item Type:
Journal Article
Journal or Publication Title:
Plant Molecular Biology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1102
Subjects:
ID Code:
51535
Deposited By:
Deposited On:
25 Nov 2011 12:35
Refereed?:
Yes
Published?:
Published
Last Modified:
20 May 2020 02:22