Production of high-starch, low-glucose potatoes through over-expression of the metabolic regulator SnRK1

A - Papers appearing in refereed journals

Mckibbin, R. S., Muttucumaru, N., Paul, M. J., Powers, S. J., Burrell, M. M., Coates, S., Purcell, P. C., Tiessen, A., Geigenberger, P. and Halford, N. G. 2006. Production of high-starch, low-glucose potatoes through over-expression of the metabolic regulator SnRK1. Plant Biotechnology Journal. 4 (4), pp. 409-418.

AuthorsMckibbin, R. S., Muttucumaru, N., Paul, M. J., Powers, S. J., Burrell, M. M., Coates, S., Purcell, P. C., Tiessen, A., Geigenberger, P. and Halford, N. G.
Abstract

Transgenic potato (Solanum tuberosum cv. Prairie) lines were produced over-expressing a sucrose non-fermenting-1-related protein kinase-1 gene (SnRK1) under the control of a patatin (tuber-specific) promoter. SnRK1 activity in the tubers of three independent transgenic lines was increased by 55%-167% compared with that in the wild-type. Glucose levels were decreased, at 17%-56% of the levels of the wild-type, and the starch content showed an increase of 23%-30%. Sucrose and fructose levels in the tubers of the transgenic plants did not show a significant change. Northern analyses of genes encoding sucrose synthase and ADP-glucose pyrophosphorylase, two key enzymes involved in the biosynthetic pathway from sucrose to starch, showed that the expression of both was increased in tubers of the transgenic lines compared with the wild-type. In contrast, the expression of genes encoding two other enzymes of carbohydrate metabolism, alpha-amylase and sucrose phosphate synthase, showed no change. The activity of sucrose synthase and ADP-glucose pyrophosphorylase was also increased, by approximately 20%-60% and three- to five-fold, respectively, whereas the activity of hexokinase was unchanged. The results are consistent with a role for SnRK1 in regulating carbon flux through the storage pathway to starch biosynthesis. They emphasize the importance of SnRK1 in the regulation of carbohydrate metabolism and resource partitioning, and indicate a specific role for SnRK1 in the control of starch accumulation in potato tubers.

KeywordsBiotechnology & Applied Microbiology; Plant Sciences
Year of Publication2006
JournalPlant Biotechnology Journal
Journal citation4 (4), pp. 409-418
Digital Object Identifier (DOI)doi:10.1111/j.1467-7652.2006.00190.x
PubMed ID17177806
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or code502
513
ISSN14677644
PublisherWiley
Grant IDBBS/E/C/00004150

Permalink - https://repository.rothamsted.ac.uk/item/89q01/production-of-high-starch-low-glucose-potatoes-through-over-expression-of-the-metabolic-regulator-snrk1

2 total views
0 total downloads
0 views this month
0 downloads this month