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Article

Fertility of Pedicellate Spikelets in Sorghum Is Controlled by a Jasmonic Acid Regulatory Module

1
Plant Stress and Germplasm Development Unit, Cropping Systems Research Laboratory, U.S. Department of Agriculture-Agricultural Research Service, Lubbock, TX 79415, USA
2
Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA
3
Plasma Technology Research Center, National Fusion Research Institute, 37, Dongjangsan-ro, Gunsan-si, Jeollabuk-do 54004, Korea
4
Current address: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
5
Chemistry Research Unit, USDA-ARS, 1700 S.W. 23RD DRIVE, Gainesville, FL 32608, USA
6
U.S. Department of Agriculture-Agricultural Research Service, NEA Robert W. Holley Center for Agriculture and Health, Cornell University, Ithaca, NY 14853, USA
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(19), 4951; https://doi.org/10.3390/ijms20194951
Received: 13 September 2019 / Revised: 1 October 2019 / Accepted: 2 October 2019 / Published: 8 October 2019
(This article belongs to the Special Issue Jasmonic Acid Pathway in Plants)
As in other cereal crops, the panicles of sorghum (Sorghum bicolor (L.) Moench) comprise two types of floral spikelets (grass flowers). Only sessile spikelets (SSs) are capable of producing viable grains, whereas pedicellate spikelets (PSs) cease development after initiation and eventually abort. Consequently, grain number per panicle (GNP) is lower than the total number of flowers produced per panicle. The mechanism underlying this differential fertility is not well understood. To investigate this issue, we isolated a series of ethyl methane sulfonate (EMS)-induced multiseeded (msd) mutants that result in full spikelet fertility, effectively doubling GNP. Previously, we showed that MSD1 is a TCP (Teosinte branched/Cycloidea/PCF) transcription factor that regulates jasmonic acid (JA) biosynthesis, and ultimately floral sex organ development. Here, we show that MSD2 encodes a lipoxygenase (LOX) that catalyzes the first committed step of JA biosynthesis. Further, we demonstrate that MSD1 binds to the promoters of MSD2 and other JA pathway genes. Together, these results show that a JA-induced module regulates sorghum panicle development and spikelet fertility. The findings advance our understanding of inflorescence development and could lead to new strategies for increasing GNP and grain yield in sorghum and other cereal crops. View Full-Text
Keywords: transcriptional regulators; plant development; jasmonic acid signaling; gene expression transcriptional regulators; plant development; jasmonic acid signaling; gene expression
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MDPI and ACS Style

Gladman, N.; Jiao, Y.; Lee, Y.K.; Zhang, L.; Chopra, R.; Regulski, M.; Burow, G.; Hayes, C.; Christensen, S.A.; Dampanaboina, L.; Chen, J.; Burke, J.; Ware, D.; Xin, Z. Fertility of Pedicellate Spikelets in Sorghum Is Controlled by a Jasmonic Acid Regulatory Module. Int. J. Mol. Sci. 2019, 20, 4951. https://doi.org/10.3390/ijms20194951

AMA Style

Gladman N, Jiao Y, Lee YK, Zhang L, Chopra R, Regulski M, Burow G, Hayes C, Christensen SA, Dampanaboina L, Chen J, Burke J, Ware D, Xin Z. Fertility of Pedicellate Spikelets in Sorghum Is Controlled by a Jasmonic Acid Regulatory Module. International Journal of Molecular Sciences. 2019; 20(19):4951. https://doi.org/10.3390/ijms20194951

Chicago/Turabian Style

Gladman, Nicholas, Yinping Jiao, Young K. Lee, Lifang Zhang, Ratan Chopra, Michael Regulski, Gloria Burow, Chad Hayes, Shawn A. Christensen, Lavanya Dampanaboina, Junping Chen, John Burke, Doreen Ware, and Zhanguo Xin. 2019. "Fertility of Pedicellate Spikelets in Sorghum Is Controlled by a Jasmonic Acid Regulatory Module" International Journal of Molecular Sciences 20, no. 19: 4951. https://doi.org/10.3390/ijms20194951

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