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From model to crop: functional characterization of SPL8 in M. truncatula led to genetic improvement of biomass yield and abiotic stress tolerance in alfalfa

Journal Article · · Plant Biotechnology Journal
DOI:https://doi.org/10.1111/pbi.12841· OSTI ID:1625923
 [1];  [2];  [2];  [3];  [3];  [2];  [2];  [3]
  1. Noble Research Inst., Ardmore OK (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC); DOE/OSTI
  2. Noble Research Inst., Ardmore OK (United States)
  3. Noble Research Inst., Ardmore OK (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
Biomass yield, salt tolerance and drought tolerance are important targets for alfalfa (Medicago sativa L.) improvement. Medicago truncatula has been developed into a model plant for alfalfa and other legumes. By screening a Tnt1 retrotransposon-tagged M. truncatula mutant population, we identified three mutants with enhanced branching. Branch development determines shoot architecture which affects important plant functions such as light acquisition, resource use and ultimately impacts biomass production. Molecular analyses revealed that the mutations were caused by Tnt1 insertions in the SQUAMOSA PROMOTER BINDING PROTEIN-LIKE 8 (SPL8) gene. The M. truncatula spl8 mutants had increased biomass yield, while overexpression of SPL8 in M. truncatula suppressed branching and reduced biomass yield. Scanning electron microscopy (SEM) analysis showed that SPL8 inhibited branching by directly suppressing axillary bud formation. Based on the M. truncatula SPL8 sequence, alfalfa SPL8 (MsSPL8) was cloned and transgenic alfalfa plants were produced. MsSPL8 down-regulated or up-regulated alfalfa plants exhibited similar phenotypes to the M. truncatula mutants or overexpression lines, respectively. Specifically, the MsSPL8 down-regulated alfalfa plants showed up to 43% increase in biomass yield in the first harvest. The impact was even more prominent in the second harvest, with up to 86% increase in biomass production compared to the control. Furthermore, downregulation of MsSPL8 led to enhanced salt and drought tolerance in transgenic alfalfa. Results from this research offer a valuable approach to simultaneously improve biomass production and abiotic stress tolerance in legumes.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
Sponsoring Organization:
Noble Research Institute, LLC; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1625923
Journal Information:
Plant Biotechnology Journal, Journal Name: Plant Biotechnology Journal Journal Issue: 4 Vol. 16; ISSN 1467-7644
Publisher:
Society for Experimental Biology; Association of Applied BiologyCopyright Statement
Country of Publication:
United States
Language:
English

References (71)

Rapid in planta evaluation of root expressed transgenes in chimeric soybean plants journal December 2009
The MicroRNA-Regulated SBP-Box Transcription Factor SPL3 Is a Direct Upstream Activator of LEAFY, FRUITFULL, and APETALA1 journal August 2009
SPL3/4/5 Integrate Developmental Aging and Photoperiodic Signals into the FT-FD Module in Arabidopsis Flowering journal December 2016
Translating Medicago truncatula genomics to crop legumes journal April 2009
Grasses provide new insights into regulation of shoot branching journal January 2013
Medicago truncatula — a model in the making! journal August 1999
Control of tillering in rice journal April 2003
The Medicago genome provides insight into the evolution of rhizobial symbioses journal November 2011
The interaction between OsMADS57 and OsTB1 modulates rice tillering via DWARF14 journal March 2013
OsSPL13 controls grain size in cultivated rice journal March 2016
sparse inflorescence1 encodes a monocot-specific YUCCA-like gene required for vegetative and reproductive development in maize journal September 2008
A class II KNOX gene, KNOX4 , controls seed physical dormancy journal June 2016
LAX and SPA: Major regulators of shoot branching in rice journal September 2003
The Lateral suppressor (Ls) gene of tomato encodes a new member of the VHIID protein family journal January 1999
Auxin biosynthesis by the YUCCA flavin monooxygenases controls the formation of floral organs and vascular tissues in Arabidopsis journal July 2006
SPL8 , an SBP-Box Gene That Affects Pollen Sac Development in Arabidopsis journal March 2003
Temporal Control of Trichome Distribution by MicroRNA156-Targeted SPL Genes in Arabidopsis thaliana journal July 2010
Rice Axillary Meristem Formation Requires Directional Movement of LAX PANICLE1 Protein journal April 2009
miR156-Targeted and Nontargeted SBP-Box Transcription Factors Act in Concert to Secure Male Fertility in Arabidopsis journal December 2010
Gibberellin-Auxin Crosstalk Modulates Lateral Root Formation journal March 2010
Negative Regulation of Anthocyanin Biosynthesis in Arabidopsis by a miR156-Targeted SPL Transcription Factor journal April 2011
Axillary Meristem Formation in Rice Requires the WUSCHEL Ortholog TILLERS ABSENT1 journal April 2015
Large-scale insertional mutagenesis using the Tnt1 retrotransposon in the model legume Medicago truncatula journal April 2008
Improvement of biomass through lignin modification journal May 2008
Tissue-specific expression of Populus C19 GA 2-oxidases differentially regulate above- and below-ground biomass growth through control of bioactive GA concentrations journal August 2011
SPL8 and miR156-targeted SPL genes redundantly regulate Arabidopsis gynoecium differential patterning journal May 2013
Shoot Branching journal June 2005
Gibberellin Metabolism and its Regulation journal June 2008
Genome-Wide Association Mapping and Genomic Selection for Alfalfa (Medicago sativa) Forage Quality Traits journal January 2017
An organ boundary‐enriched gene regulatory network uncovers regulatory hierarchies underlying axillary meristem initiation journal October 2014
Bud structure, position and fate generate various branching patterns along shoots of closely related Rosaceae species: a review journal December 2014
Alfalfa (Medicago sativa L.) book September 2014
Identification of quantitative trait loci influencing aerial morphogenesis in the model legume Medicago truncatula journal March 2007
Multi-population QTL detection for aerial morphogenetic traits in the model legume Medicago truncatula journal November 2011
Transgenic Medicago truncatula plants obtained from Agrobacterium tumefaciens -transformed roots and Agrobacterium rhizogenes-transformed hairy roots journal March 2006
Something on the Side: Axillary Meristems and Plant Development journal April 2006
Physiological genetics of alfalfa improvement: past failures, future prospects journal May 2002
Medicago truncatula — a model in the making! journal August 1999
miR156-Regulated SPL Transcription Factors Define an Endogenous Flowering Pathway in Arabidopsis thaliana journal August 2009
A Novel Zinc-binding Motif Revealed by Solution Structures of DNA-binding Domains of Arabidopsis SBP-family Transcription Factors journal March 2004
Shoot branching journal February 2004
Branching in rice journal February 2011
The role of barren stalk1 in the architecture of maize journal December 2004
Strigolactone inhibition of shoot branching journal August 2008
Structural basis for gibberellin recognition by its receptor GID1 journal November 2008
The OsSPL16-GW7 regulatory module determines grain shape and simultaneously improves rice yield and grain quality journal July 2015
Regulation of OsSPL14 by OsmiR156 defines ideal plant architecture in rice journal May 2010
OsSPL14 promotes panicle branching and higher grain productivity in rice journal May 2010
Quantitative analysis of major plant hormones in crude plant extracts by high-performance liquid chromatography–mass spectrometry journal May 2010
Signal integration in the control of shoot branching journal March 2011
An associative analysis of gene expression array data journal January 2003
Sequencing the Genespaces of Medicago truncatula and Lotus japonicus : Figure 1. journal April 2005
Genomic Organization, Differential Expression, and Interaction of SQUAMOSA Promoter-Binding-Like Transcription Factors and microRNA156 in Rice journal July 2006
Hormonal Regulation of Branching in Grasses journal January 2009
Two-Step Regulation of LAX PANICLE1 Protein Accumulation in Axillary Meristem Formation in Rice journal April 2009
Gibberellins Regulate Lateral Root Formation in Populus through Interactions with Auxin and Other Hormones journal March 2010
STM/BP-Like KNOXI Is Uncoupled from ARP in the Regulation of Compound Leaf Development in Medicago truncatula journal April 2014
Overexpression of WXP1, a putative Medicago truncatula AP2 domain-containing transcription factor gene, increases cuticular wax accumulation and enhances drought tolerance in transgenic alfalfa (Medicago sativa): WXP1 activates wax production in alfalfa journal April 2005
Large-scale insertional mutagenesis using the Tnt1 retrotransposon in the model legume Medicago truncatula journal April 2008
Improvement of biomass through lignin modification journal May 2008
The bHLH protein ROX acts in concert with RAX1 and LAS to modulate axillary meristem formation in Arabidopsis: ROX modulates axillary bud formation journal April 2012
MicroRNA156 as a promising tool for alfalfa improvement journal December 2014
The miR156-SPL9-DFR pathway coordinates the relationship between development and abiotic stress tolerance in plants journal November 2014
Integration of Plant Responses to Environmentally Activated Phytohormonal Signals journal January 2006
Accuracy of genomic selection for alfalfa biomass yield in different reference populations journal December 2015
Managing Nitrogen Contaminated Soils:Benefits of N 2 -Fixing Alfalfa journal May 2007
A Snapshot of Functional Genetic Studies in Medicago truncatula journal August 2016
An Insight into microRNA156 Role in Salinity Stress Responses of Alfalfa journal March 2017
The Use of Gene Modification and Advanced Molecular Structure Analyses towards Improving Alfalfa Forage journal January 2017
SPL8, an SBP-box gene that affects pollen sac development in Arabidopsis text January 2003
Accuracy of genomic selection for alfalfa biomass yield in different reference populations collection January 2015

Cited By (21)

Ectopic expression of Medicago truncatula homeodomain finger protein, MtPHD6, enhances drought tolerance in Arabidopsis journal December 2019
Roles of the SPL gene family and miR156 in the salt stress responses of tamarisk (Tamarix chinensis) journal August 2019
OsSPL10, a SBP-Box Gene, Plays a Dual Role in Salt Tolerance and Trichome Formation in Rice (Oryza sativa L.) journal December 2019
Additional file 1 of Genome-wide identification, phylogeny and expression analysis of the SPL gene family and its important role in salt stress in Medicago sativa L. dataset January 2022
Additional file 2 of Genome-wide identification, phylogeny and expression analysis of the SPL gene family and its important role in salt stress in Medicago sativa L. dataset January 2022
Additional file 3 of Genome-wide identification, phylogeny and expression analysis of the SPL gene family and its important role in salt stress in Medicago sativa L. dataset January 2022
Additional file 4 of Genome-wide identification, phylogeny and expression analysis of the SPL gene family and its important role in salt stress in Medicago sativa L. dataset January 2022
Additional file 5 of Genome-wide identification, phylogeny and expression analysis of the SPL gene family and its important role in salt stress in Medicago sativa L. image January 2022
Additional file 6 of Genome-wide identification, phylogeny and expression analysis of the SPL gene family and its important role in salt stress in Medicago sativa L. image January 2022
Additional file 1 of Genome-wide investigation of NLP gene family members in alfalfa (Medicago sativa L.): evolution and expression profiles during development and stress dataset January 2023
Additional file 3 of Genome-wide investigation of NLP gene family members in alfalfa (Medicago sativa L.): evolution and expression profiles during development and stress dataset January 2023
Additional file 4 of Genome-wide investigation of NLP gene family members in alfalfa (Medicago sativa L.): evolution and expression profiles during development and stress dataset January 2023
Additional file 5 of Genome-wide investigation of NLP gene family members in alfalfa (Medicago sativa L.): evolution and expression profiles during development and stress dataset January 2023
Additional file 6 of Genome-wide investigation of NLP gene family members in alfalfa (Medicago sativa L.): evolution and expression profiles during development and stress dataset January 2023
miR535 negatively regulates cold tolerance in rice journal January 2020
Engineering abiotic stress response in plants for biomass production journal January 2018
SPL 7 and SPL 8 represent a novel flowering regulation mechanism in switchgrass journal February 2019
Genome‐wide analysis of flanking sequences reveals that  Tnt1 insertion is positively correlated with gene methylation in Medicago truncatula journal March 2019
Abiotic Stress Signaling in Wheat – An Inclusive Overview of Hormonal Interactions During Abiotic Stress Responses in Wheat journal June 2018
Transcriptome and Small RNA Sequencing Analysis Revealed Roles of PaWB-Related miRNAs and Genes in Paulownia fortunei journal July 2018
Melatonin Application Improves Salt Tolerance of Alfalfa (Medicago sativa L.) by Enhancing Antioxidant Capacity journal February 2020

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