A Novel Variation in the FRIZZLE PANICLE (FZP) Gene Promoter Improves Grain Number and Yield in Rice

Abstract Secondary branch number per panicle plays a crucial role in regulating grain number and yield in rice. Here, we report the positional cloning and functional characterization for SECONDARY BRANCH NUMBER7 (qSBN7), a quantitative trait locus affecting secondary branch per panicle and grain num...

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Published in:Genetics (Austin) 2020-05, Vol.215 (1), p.243-252
Main Authors: Wang, Sheng-Shan, Chung, Chia-Lin, Chen, Kai-Yi, Chen, Rong-Kuen
Format: Article
Language:English
Subjects:
Agricultural biotechnology
Cloning
Contamination
Crop yield
Cultivars
Deoxyribonucleic acid
DNA
Edible Grain - genetics
Edible Grain - growth & development
Fertilizers
Gene mapping
Genes
Genetic testing
Genetics
Genomics
Investigations
Meristems
MicroRNAs
Oryza - genetics
Oryza - growth & development
Plant breeding
Plant Proteins - genetics
Plant Proteins - metabolism
Plasmids
Polymorphism, Single Nucleotide
Promoter Regions, Genetic
Quantitative Trait Loci
Rice
Transcription
Transgenic plants
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Summary:Abstract Secondary branch number per panicle plays a crucial role in regulating grain number and yield in rice. Here, we report the positional cloning and functional characterization for SECONDARY BRANCH NUMBER7 (qSBN7), a quantitative trait locus affecting secondary branch per panicle and grain number. Our research revealed that the causative variants of qSBN7 are located in the distal promoter region of FRIZZLE PANICLE (FZP), a gene previously associated with the repression of axillary meristem development in rice spikelets. qSBN7 is a novel allele of FZP that causes an ∼56% decrease in its transcriptional level, leading to increased secondary branch and grain number, and reduced grain length. Field evaluations showed that qSBN7 increased grain yield by 10.9% in a temperate japonica variety, TN13, likely due to its positive effect on sink capacity. Our findings suggest that incorporation of qSBN7 can increase yield potential and improve the breeding of elite rice varieties.
ISSN:1943-2631
0016-6731
1943-2631
DOI:10.1534/genetics.119.302862