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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

A rice mutant lacking a large subunit of ADP-glucose pyrophosphorylase has drastically reduced starch content in the culm but normal plant morphology and yield

Frederick R. Cook A , Brendan Fahy A and Kay Trafford A B C
+ Author Affiliations
- Author Affiliations

A John Innes Centre, Norwich Research Park, Norfolk, NR4 7UH, UK.

B Present address: National Institute of Agricultural Botany, Huntingdon Road, Cambridge, CB3 0 LE, UK.

C Corresponding author. Email: kay.trafford@niab.com

Functional Plant Biology 39(12) 1068-1078 https://doi.org/10.1071/FP12186
Submitted: 26 June 2012  Accepted: 3 September 2012   Published: 23 October 2012

Abstract

A mutant of rice (Oryza sativa L.) was identified with a Tos17 insertion in Os05g50380, a gene encoding a plastidial large subunit (LSU) of ADP-glucose pyrophosphorylase (AGPase) that was previously called OsAPL3 or OsAGPL1. The insertion prevents the production of a normal transcript. Characterisation of the mutant showed that this LSU is required for 97% of the starch synthesised in the flowering stem (culm), approximately half of the AGPase activity in developing embryos and that it contributes to AGPase activity in the endosperm. Despite the near absence of starch in the culms and reduced starch content in the embryos, the mutant rice plants grow and develop normally, and show no reduction in productivity. The starch content of leaves is increased in the mutant, revealing plasticity in the distribution of photosynthates among different temporary carbohydrate storage pools within the plant.

Additional keywords: carbohydrate, flowering stem, Tos17.


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