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

Author

Listed:
  • Yinping Jiao

    (Cropping Systems Research Laboratory
    Cold Spring Harbor Laboratory)

  • Young Koung Lee

    (Cold Spring Harbor Laboratory
    Wonkwang University)

  • Nicholas Gladman

    (Cropping Systems Research Laboratory
    Cold Spring Harbor 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
    Cornell University)

  • Zhanguo Xin

    (Cropping Systems Research Laboratory)

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.

Suggested Citation

  • Yinping Jiao & Young Koung Lee & Nicholas Gladman & Ratan Chopra & Shawn A. Christensen & Michael Regulski & Gloria Burow & Chad Hayes & John Burke & Doreen Ware & Zhanguo Xin, 2018. "MSD1 regulates pedicellate spikelet fertility in sorghum through the jasmonic acid pathway," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03238-4
    DOI: 10.1038/s41467-018-03238-4
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