期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 20, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/ijms20194951
关键词
transcriptional regulators; plant development; jasmonic acid signaling; gene expression
资金
- United Sorghum Checkoff program
- USDA [ARS 3096-21000-019-00-D, ARS 8062-21000-041-00D]
- Next-Generation BioGreen 21 Program, Rural Development Administration, Republic of Korea [PJ013658032019]
- R&D Program of 'Plasma Advanced Technology for Agriculture and Food (Plasma Farming)' through the National Fusion Research Institute of Korea (NFRI)
- ARS-funded postdoc fellowship
- Rural Development Administration (RDA), Republic of Korea [PJ013658032019] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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