Expression of a Plant Cell Wall Invertase in Roots of Arabidopsis Leads to Early Flowering and an Increase in Whole Plant Biomass

Abstract

In order to enhance sink strength, we expressed a heterologous plant cell wall invertase (CrCIN1) under the control of a root-specific promoter (ppyk10) in Arabidopsis thaliana. Slightly elevated apoplastic invertase activity resulted in apparent phenotypic changes. Transgenic plants developed more secondary roots and subsequently, possibly because of a higher capacity to acquire nutrients, a higher shoot and whole plant biomass. Furthermore, an early flowering phenotype was detected. The data presented here demonstrate that it is possible to modulate carbohydrate metabolism by ectopic expression of cell wall invertases and thereby influence sink organ size and whole plant development.

Arabidopsis - cell wall invertase - sink strength - assimilate partitioning - flowering.

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Editor: A. Weber