Scientia Agricultura Sinica ›› 2026, Vol. 59 ›› Issue (5): 1070-1086.doi: 10.3864/j.issn.0578-1752.2026.05.012

• HORTICULTURE • Previous Articles     Next Articles

Widely Targeted Metabolomics-Based Analysis of the Differences in Tibetan Bunching Onion and Chive on Nutritional Quality and Flavonoid Metabolites

YUE LiXin1(), WANG QingHua1, WANG ZhenBao1, NIMAQIONGJI2, LIU ZeZhou1, KONG SuPing1, ZHANG LiFeng1, GAO LiMin1()   

  1. 1 Institute of Vegetables, Shandong Academy of Agricultural Sciences/Key Laboratory of Huang Huai Protected Horticulture Engineering, Ministry of Agriculture and Rural Affairs/Shandong Key Laboratory of Bulk Open-Field Vegetable Breeding, Ji’nan 250100
    2 Investment Promotion of Shigatse National Agricultural Science and Technology Park, Shigatse 857000, Xizang
  • Received:2025-10-13 Accepted:2025-12-02 Online:2026-03-01 Published:2026-03-06
  • Contact: GAO LiMin

Abstract:

【Objective】 The purpose of this study is to investigate the differences in agronomic traits, nutritional quality, and metabolic components between Tibetan bunching onion and chive to elucidate their unique nutritional and metabolic characteristics, thereby exploring their distinctive resource value. These findings will provide a scientific basis for the exploitation of the unique resource value of Tibetan bunching onion, as well as for the promotion of the high-value utilization and varietal improvement of specialty vegetables in Xizang.【Method】 The materials used in this study were Tibetan bunching onion and chive. A systematic comparison of their agronomic traits and nutritional quality was conducted through physiological and biochemical analyses. The metabolic profiles of the subjects were analyzed using widely targeted metabolomics, with differential metabolites being identified using the criteria of VIP>1 and FC≥2 or FC≤0.5. Subsequent KEGG pathway enrichment analysis was performed to elucidate the impacted metabolic pathways.【Result】 The results showed that there were significant differences between the two species in terms of pseudostem morphology, epidermal color, plant height, pseudostem length, leaf length, and single plant weight. Nutritional quality analysis showed that the dry matter, free amino acid, pyruvic acid, and crude fiber contents of Tibetan bunching onion were higher than those of chive, while the soluble solids, soluble sugars, vitamin C content, and sugar-acid ratio were significantly lower. Utilizing the widely targeted metabolomics-based technology, a total of 2 014 metabolites from 13 distinct classes were identified, predominantly comprising flavonoids, lipids, and alkaloids. Then 1 012 differential metabolites were identified by multivariate statistical analysis, of which 583 were up-regulated and 429 were down-regulated. KEGG pathway enrichment analysis demonstrated that the differential metabolites were significantly enriched in pathways associated with flavonoid biosynthesis, primarily encompassing the biosynthesis of flavones and flavanols, anthocyanin glycosides, and the biosynthetic pathways of kaempferol aglycone Ⅰ and quercetin aglycone Ⅰ. By constructing a flavonoid anabolic network and comparing the relative contents of metabolites, significant interspecific divergence in downstream flavonoid metabolite accumulation between Tibetan bunching onion and chive was revealed. The diversity was mainly due to the branch transformation of the common precursor dihydrokaempferol, which led to the synthesis and accumulation of different secondary metabolites, including flavonols (kaempferol and quercetin) and anthocyanins (cyanidin and delphinidin).【Conclusion】 Significant differences were observed in the agronomic traits, nutritional quality, and metabolite accumulation of the two Allium species. The Tibetan bunching onion had a high dry matter and amino acid content, a spicy and rich flavor, a coarse texture, and good storage resistance. In contrast, the chive was rich in sugars and vitamin C, and tasted sweet and fresh. Differentiation of the flavonoid synthesis pathway is mainly due to the transformation of dihydrokaempferol branches, which produce various metabolites such as flavanols and anthocyanins.

Key words: Allium, leaf, nutritional quality, widely targeted metabolomics, flavonoids, metabolic differences

Fig. 1

Phenotypic of the Tibetan bunching onion and chive ZC: Tibetan bunching onion; YX: Chive. Bars=15 cm. The same as below"

Table 1

Statistical analysis of agronomic traits of Tibetan bunching onion and chive"

样本
Samples
分蘖数
Tiller numbers
单株叶数
Leaf numbers
株高
Plant height (cm)
假茎长
Pseudostem length (cm)
叶片长
Leaf length
(cm)
叶扁宽
Leaf weight (mm)
假茎粗
Pseudostem width (mm)
单株重
Single plant weight (g)
藏葱ZC 5.33±2.05a 4.60±0.66a 59.90±5.05a 17.00±0.92a 43.65±4.14a 8.29±1.03b 8.58±1.15a 16.19±3.96a
细香葱YX 5.75±1.48a 4.20±0.60a 46.85±5.23b 11.45±1.29b 35.45±4.65b 13.27±0.66a 8.96±1.36a 11.60±1.23b

Fig. 2

The determination of quality traits of Tibetan bunching onion and chive"

Fig. 3

The overall metabolite profile analysis of quality traits of Tibetan bunching onion and chive A: Classification and proportion of metabolites; B: Metabolite subclass analysis of the top five metabolites in the number of species; C: Clustering heatmap of metabolites"

Fig. 4

The multivariate statistical analysis of metabolites A: Correlational analysis of samples; B: PCA analysis; C: OPLS-DA score plot of different groups; D: OPLS-DA model of metabolites"

Fig. 5

Screening of differential metabolites and functional enrichment analysis A: Volcano plots of differential metabolites; B: Bar graph of the top 20 significant different metabolite multiples, *: Presence of isomers of this substance; C: KEGG enrichment map of differential metabolites"

Fig. 6

Flavonoid biosynthesis pathway and relative content of its metabolites Blue to red indicates the relative content of metabolites from low to high. Solid arrows indicate direct synthesis. The same as below"

Fig. 7

Delphinidin biosynthesis pathway and relative content of its metabolites Dashed arrows indicate indirect synthesis. The same as below"

Fig. 8

Cyanidin biosynthesis pathway and relative content of its metabolites"

Fig. 9

Kaempferol and quercetin biosynthesis pathway and relative content of its metabolites"

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