Abstract
The goal of this study was to elucidate the genetic and molecular regulatory mechanisms underlying agronomic traits in elite alfalfa (Medicago sativa L.). Through the analysis of 44 varieties and lines, we measured 19 yield-related traits and performed transcriptome sequencing to investigate the factors driving yield variation. The results indicated extensive variation in agronomic traits among the tested accessions, with the coefficients of variation (CVs) ranging from 7.85% to 42.66%, suggesting substantial potential for genetic improvement. Correlation analysis revealed that seed yield was significantly and positively correlated with the number of reproductive branches and inflorescences at maturity, whereas early vegetative growth was negatively correlated with 100-seed weight. The 44 accessions were categorized into three clusters: Cluster II (the largest group) exhibited balanced traits; Cluster I showed vigorous early growth but low pod yield; and Cluster III was characterized by the highest pod and branch numbers. Principal Component Analysis (PCA) explained 65.88% of the total variation (first six components), identifying GNS31 and GNS43 as the superior and inferior genotypes, respectively. Furthermore, transcriptome profiling detected the highest number of differentially expressed genes (10,089 DEGs) in pod tissues, with 66% being upregulated. Functional enrichment analyses (GO and KEGG) highlighted that varietal differences were primarily enriched in secondary metabolism, lipid metabolism, and plant hormone signal transduction pathways. Notably, within the auxin pathway, the SAUR and GH3 families displayed significant tissue-specific expression in pods.
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Claims 11
Claim · model-written summary
Agronomic traits varied across the 44 alfalfa accessions, with coefficients of variation from 7.85% to 42.66%.
- Taxon
- Alfalfa
Medicago sativat0 - Outcome
- agronomic traitse0
- Value
- 7.85% to 42.66%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extensive variation in agronomic traits among the tested accessions, with the coefficients of variation (CVs) ranging from 7.85% to 42.66%”
t0“Alfalfa”
Claim · model-written summary
Seed yield was significantly positively associated with reproductive branch and inflorescence numbers at maturity.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- maturitye0
- Outcome
- seed yielde0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed yield was significantly and positively correlated with the number of reproductive branches and inflorescences at maturity”
t0“Alfalfa”
Claim · model-written summary
Early vegetative growth was negatively correlated with 100-seed weight.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- early vegetative growthe0
- Outcome
- 100-seed weighte0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early vegetative growth was negatively correlated with 100-seed weight”
t0“Alfalfa”
Claim · model-written summary
The accessions formed three clusters: II had balanced traits, I had vigorous early growth and low pod yield, and III had the highest pod and branch numbers.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- three clusterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 44 accessions were categorized into three clusters: Cluster II (the largest group) exhibited balanced traits; Cluster I showed vigorous early growth but low pod yield; and Cluster III was characterized by the highest pod and branch numbers.”
t0“Alfalfa”
Claim · model-written summary
The first six principal components explained 65.88% of trait variation.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- total variatione0
- Value
- 65.88%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Principal Component Analysis (PCA) explained 65.88% of the total variation (first six components)”
t0“Alfalfa”
Claim · model-written summary
GNS31 was identified as the superior genotype.
- Taxon
- AlfalfaMedicago sativat0
- Material
- GNS31e0
- Outcome
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identifying GNS31 and GNS43 as the superior and inferior genotypes, respectively”
t0“Alfalfa”
Claim · model-written summary
GNS43 was identified as the inferior genotype.
- Taxon
- AlfalfaMedicago sativat0
- Material
- GNS43e0
- Outcome
- inferiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identifying GNS31 and GNS43 as the superior and inferior genotypes, respectively”
t0“Alfalfa”
Claim · model-written summary
Pod tissue had the largest number of differentially expressed genes, 10,089.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- pod tissuese0
- Outcome
- differentially expressed genese0
- Direction
- higheste0
- Value
- 10,089 DEGse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest number of differentially expressed genes (10,089 DEGs) in pod tissues”
t0“Alfalfa”
Claim · model-written summary
Of the pod differentially expressed genes, 66% were upregulated.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- pod tissuese1
- Outcome
- upregulatede0
- Value
- 66%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with 66% being upregulated”
e1“in pod tissues”
t0“Alfalfa”
Claim · model-written summary
Varietal differences were enriched in secondary metabolism, lipid metabolism and plant hormone signal transduction pathways.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- varietal differences were primarily enriched in secondary metabolism, lipid metabolism, and plant hormone signal transduction pathwayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varietal differences were primarily enriched in secondary metabolism, lipid metabolism, and plant hormone signal transduction pathways”
t0“Alfalfa”
Claim · model-written summary
SAUR and GH3 families had significant tissue-specific expression in pods.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- podse0
- Gene
- SAUR and GH3 familiese0
- Outcome
- tissue-specific expressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the SAUR and GH3 families displayed significant tissue-specific expression in pods”
t0“Alfalfa”