MSD1 regulates pedicellate spikelet fertility in sorghum through the jasmonic acid pathway.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29483511.
- Also identified by DOI 10.1038/s41467-018-03238-4 and PMC identifier 5826930.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Grain number per panicle (GNP) is a major determinant of grain yield in cereals. However, the mechanisms that regulate GNP remain unclear. To address this issue, we isolate a series of sorghum [Sorghum bicolor (L.) Moench] multiseeded (msd) mutants that can double GNP by increasing panicle size and altering floral development so that all spikelets are fertile and set grain. Through bulk segregant analysis by next-generation sequencing, we identify MSD1 as a TCP (Teosinte branched/Cycloidea/PCF) transcription factor. Whole-genome expression profiling reveals that jasmonic acid (JA) biosynthetic enzymes are transiently activated in pedicellate spikelets. Young msd1 panicles have 50% less JA than wild-type (WT) panicles, and application of exogenous JA can rescue the msd1 phenotype. Our results reveal a new mechanism for increasing GNP, with the potential to boost grain yield, and provide insight into the regulation of plant inflorescence architecture and development.
Medical subject headings
- Cyclopentanes
- Gene Expression Regulation, Plant
- Inflorescence
- Oxylipins
- Plant Growth Regulators
- Seeds
- Sorghum