A mutant of rice lacking the leaf large subunit of ADP-glucose pyrophosphorylase has drastically reduced leaf starch content but grows normally

Functional Plant Biology : FPB
Sandrine RöstiK Denyer

Abstract

A mutant of rice was identified with a Tos17 insertion in OsAPL1, a gene encoding a large subunit (LSU) of ADP-glucose pyrophosphorylase (AGPase). The insertion prevents production of a normal transcript from OsAPL1. Characterisation of the mutant (apl1) showed that the LSU encoded by OsAPL1 is required for AGPase activity in rice leaf blades. In mutant leaf blades, the AGPase small subunit protein is not detectable and the AGPase activity and starch content are reduced to <1 and <5% of that in wild type blades, respectively. The mutation also leads to a reduction in starch content in the leaf sheaths but does not significantly affect AGPase activity or starch synthesis in other parts of the plant. The sucrose, glucose and fructose contents of the leaves are not affected by the mutation. Despite the near absence of starch in the leaf blades, apl1 mutant rice plants grow and develop normally under controlled environmental conditions and show no reduction in productivity.

References

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Citations

Oct 6, 2017·Journal of Experimental Botany·Gregory J MacNeillMichael J Emes
Jun 10, 2009·Journal of Experimental Botany·Sylviane Comparot-Moss, Kay Denyer
May 19, 2018·Protoplasma·Asena GorenIan J Tetlow
Jun 27, 2018·Journal of Integrative Plant Biology·Yue CaiJianmin Wan
Jul 15, 2015·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Gautam Saripalli, Pushpendra Kumar Gupta
Oct 1, 2020·The Plant Journal : for Cell and Molecular Biology·Qi MengGuohua Xu

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