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

Yinping Jiao, Young Koung Lee, Nicholas Gladman, Ratan Chopra, Shawn A. Christensen, Michael Regulski, Gloria Burow, Chad Hayes, John Burke, Doreen Ware () and Zhanguo Xin ()
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Yinping Jiao: Cropping Systems Research Laboratory
Young Koung Lee: Cold Spring Harbor Laboratory
Nicholas Gladman: Cropping Systems Research Laboratory
Ratan Chopra: Cropping Systems Research Laboratory
Shawn A. Christensen: Chemistry Research Unit, USDA-ARS
Michael Regulski: Cold Spring Harbor Laboratory
Gloria Burow: Cropping Systems Research Laboratory
Chad Hayes: Cropping Systems Research Laboratory
John Burke: Cropping Systems Research Laboratory
Doreen Ware: Cold Spring Harbor Laboratory
Zhanguo Xin: Cropping Systems Research Laboratory

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-03238-4

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