Metabolic control of seedling development by invertases

Functional Plant Biology : FPB
Katharina B BonfigThomas Roitsch

Abstract

Invertases are important enzymes in higher plants, which are involved in regulating developmental processes and responses to external factors. In a functional approach the role of invertases was investigated using transgenic plants ectopically expressing inhibitor proteins to decrease invertase activity. For generating specific effects, these inhibitor proteins were expressed in Arabidopsis under the control of synthetic promoters consisting of tetramers of pathogen-inducible elements, which were reported to yield low constitutive expression. Unexpectedly, seedling growth of putative transgenic plants was arrested at the four-leaf stage. Analysis of β-glucuronidase activity of corresponding reporter gene lines showed a correlation of the growth arrest with high activity of these promoters in seedlings grown under tissue culture conditions. The negative effect of invertase inhibition on seedling growth was substantiated by transgenic tobacco plants expressing an invertase inhibitor under control of a tetracycline inducible promoter. Ectopic induction of the invertase inhibitor during early seedling development resulted in a reduced fresh weight of seedlings. The importance of invertase in seedling development is further supporte...Continue Reading

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Citations

Mar 2, 2011·Molecular Plant Pathology·Johannes SiemensJutta Ludwig-Müller

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