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G-protein βγ subunits determine grain size through interaction with MADS-domain transcription factors in rice
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G-protein βγ subunits determine grain size through interaction with MADS-domain transcription factors in rice
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G-protein βγ subunits determine grain size through interaction with MADS-domain transcription factors in rice
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Journal Article
G-protein βγ subunits determine grain size through interaction with MADS-domain transcription factors in rice
2018
Overview
The simultaneous improvement of grain quality and yield of cereal crops is a major challenge for modern agriculture. Here we show that a rice grain yield quantitative trait locus
qLGY3
encodes a MADS-domain transcription factor OsMADS1, which acts as a key downstream effector of G-protein βγ dimers. The presence of an alternatively spliced protein OsMADS1
lgy3
is shown to be associated with formation of long and slender grains, resulting in increases in both grain quality and yield potential of rice. The Gγ subunits GS3 and DEP1 interact directly with the conserved keratin-like domain of MADS transcription factors, function as cofactors to enhance OsMADS1 transcriptional activity and promote the co-operative transactivation of common target genes, thereby regulating grain size and shape. We also demonstrate that combining
OsMADS1
lgy3
allele with high-yield-associated
dep1-1
and
gs3
alleles represents an effective strategy for simultaneously improving both the productivity and end-use quality of rice.
Cereal crops' grain yield and quality are traits that are usually considered to be negatively correlated. Here, the authors show that interaction of G-protein βγ subunits with an alternatively spliced MADS1
lgy3
protein can increase rice grain yield and quality simultaneously in field conditions.
