Journal article
The Juvenile Phase of Maize Sees Upregulation of Stress-Response Genes and Is Extended by Exogenous Jasmonic Acid
Plant physiology (Bethesda), Vol.171(4), pp.2648-2658
08/2016
DOI: 10.1104/pp.15.01707
PMID: 27307257
Abstract
As maize (Zea mays) plants undergo vegetative phase change from juvenile to adult, they both exhibit heteroblasty, an abrupt change in patterns of leaf morphogenesis, and gain the ability to produce flowers. Both processes are under the control of microRNA156 (miR156), whose levels decline at the end of the juvenile phase. Gain of the ability to flower is conferred by the expression of miR156 targets that encode SQUAMOSA PROMOTER-BINDING transcription factors, which, when derepressed in the adult phase, induce the expression of MADS box transcription factors that promote maturation and flowering. How gene expression, including targets of those microRNAs, differs between the two phases remains an open question. Here, we compare transcript levels in primordia that will develop into juvenile or adult leaves to identify genes that define these two developmental states and may influence vegetative phase change. In comparisons among successive leaves at the same developmental stage, plastochron 6, three-fourths of approximately 1,100 differentially expressed genes were more highly expressed in primordia of juvenile leaves. This juvenile set was enriched in photosynthetic genes, particularly those associated with cyclic electron flow at photosystem I, and in genes involved in oxidative stress and retrograde redox signaling. Pathogen- and herbivory-responsive pathways including salicylic acid and jasmonic acid also were up-regulated in juvenile primordia; indeed, exogenous application of jasmonic acid delayed both the appearance of adult traits and the decline in the expression of miR156-encoding loci in maize seedlings. We hypothesize that the stresses associated with germination promote juvenile patterns of differentiation in maize.
Details
- Title: Subtitle
- The Juvenile Phase of Maize Sees Upregulation of Stress-Response Genes and Is Extended by Exogenous Jasmonic Acid
- Creators
- Benjamin Beydler - Department of Biology, University of Iowa, Iowa City, Iowa 52242Krista Osadchuk - Department of Biology, University of Iowa, Iowa City, Iowa 52242Chi-Lien Cheng - Department of Biology, University of Iowa, Iowa City, Iowa 52242J Robert Manak - Department of Biology, University of Iowa, Iowa City, Iowa 52242Erin E Irish - Department of Biology, University of Iowa, Iowa City, Iowa 52242 erin-irish@uiowa.edu
- Resource Type
- Journal article
- Publication Details
- Plant physiology (Bethesda), Vol.171(4), pp.2648-2658
- DOI
- 10.1104/pp.15.01707
- PMID
- 27307257
- NLM abbreviation
- Plant Physiol
- ISSN
- 1532-2548
- eISSN
- 1532-2548
- Publisher
- United States
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation (NSF), award: 0820562
- Language
- English
- Date published
- 08/2016
- Academic Unit
- Stead Family Department of Pediatrics; Biology; Craniofacial Anomalies Research Center; University College Courses
- Record Identifier
- 9983992067102771
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