A single nucleotide substitution at the 3'-end of SBPase gene involved in Calvin cycle severely affects plant growth and grain yield in rice.

BMC Plant Biology
Chun LiPingrong Wang

Abstract

Calvin cycle plays a crucial role in carbon fixation which provides the precursors of organic macromolecules for plant growth and development. Currently, no gene involved in Calvin cycle has been identified in monocotyledonous plants through mutant or/and map-based cloning approach. Here, we isolated a low-tillering mutant, c6635, in rice (Oryza sativa). The mutant displayed light green leaves and intensely declined pigment contents and photosynthetic capacity at early growth stage. Moreover, its individual plant showed a much smaller size, and most individuals produced only two tillers. At mature stage, its productive panicles, grain number and seed setting rate were significantly decreased, which lead to a sharp reduction of the grain yield. We confirmed that a single nucleotide mutation in LOC_Os04g16680 gene encoding sedoheptulose 1,7-bisphosphatase (SBPase) involved in Calvin cycle was responsible for the mutant phenotype of c6635 through map-based cloning, MutMap analysis and complementation experiments. Sequence analysis suggested that the point mutation caused an amino acid change from Gly-364 to Asp at the C-terminal of SBPase. In addition, OsSBPase gene was mainly expressed in leaf, and the encoded protein was located...Continue Reading

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Citations

Feb 11, 2021·Applied Microbiology and Biotechnology·Yi JiangTengfei Wang

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Datasets Mentioned

BETA
CBH32512.1
ONM36378.1
ACQ82818.1
AII99841.1
AAB33001.1
ABF68592.1

Methods Mentioned

BETA
transmission electron microscopy
transgenic
PCR

Software Mentioned

MEGA5
ChloroP
Gramene
MutMap
TargetP
BLASTP
Primer5
DNAMAN

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