Engineering starch accumulation by manipulation of phosphate metabolism of starch.

Abstract:

:A new understanding of leaf starch degradation has emerged in the last 10 years. It has been shown that starch phosphorylation and dephosphorylation are critical components of this process. Glucan, water dikinase (GWD) (and phosphoglucan, water dikinase) adds phosphate to starch, and phosphoglucan phosphatase (SEX4) removes these phosphates. To explore the use of this metabolism to manipulate starch accumulation, Arabidopsis (Arabidopsis thaliana) plants were engineered by introducing RNAi constructs designed to reduce expression of AtGWD and AtSEX4. The timing of starch build-up was altered with ethanol-inducible and senescence-induced gene promoters. Ethanol induction of RNAi lines reduced transcript for AtGWD and AtSEX4 by 50%. The transgenic lines had seven times more starch than wild type at the end of the dark period but similar growth rates and total biomass. Elevated leaf starch content in maize leaves was engineered by making an RNAi construct against a gene in maize that appeared to be homologous to AtGWD. The RNAi construct was expressed using the constitutive ubiquitin promoter. Leaf starch content at the end of a night period in engineered maize plants was 20-fold higher than in untransformed plants with no impact on total plant biomass. We conclude that plants can be engineered to accumulate starch in the leaves with little impact on vegetative biomass.

journal_name

Plant Biotechnol J

authors

Weise SE,Aung K,Jarou ZJ,Mehrshahi P,Li Z,Hardy AC,Carr DJ,Sharkey TD

doi

10.1111/j.1467-7652.2012.00684.x

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

545-54

issue

5

eissn

1467-7644

issn

1467-7652

journal_volume

10

pub_type

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