MSD1 regulates pedicellate spikelet fertility in sorghum through the jasmonic acid pathway

Jiao, Y., Lee, Y. K., Gladman, N., Chopra, R., Christensen, S. A., Regulski, M., Burow, G., Hayes, C., Burke, J., Ware, D., Xin, Z. (2018) MSD1 regulates pedicellate spikelet fertility in sorghum through the jasmonic acid pathway. Nat Commun, 9 (1). p. 822. ISSN 2041-1723

DOI: 10.1038/s41467-018-03238-4


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.

Item Type: Paper
Subjects: Investigative techniques and equipment > assays > next generation sequencing
organism description > plant
CSHL Authors:
Communities: CSHL labs > Ware lab
Depositing User: Matt Covey
Date Deposited: 07 Mar 2018 13:34
Last Modified: 07 Mar 2018 13:34
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