Scientia Agricultura Sinica ›› 2026, Vol. 59 ›› Issue (6): 1172-1188.doi: 10.3864/j.issn.0578-1752.2026.06.003

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Integrated Multi-Stage Evaluation of Salt Tolerance in Vicia faba L. and Itaconic Acid-Mediated Alleviation of Germination-Stage Salt Stress

ZHANG ZhiLin1,2(), LIU Rong2, ZONG XuXiao2, HAO XiaoPeng1(), YANG Tao2()   

  1. 1 College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, Shanxi
    2 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Evaluation Crop Genetic Resources, Ministry of Agriculture and Rural Affairs, Beijing 100081
  • Received:2025-08-24 Accepted:2025-10-13 Online:2026-03-16 Published:2026-03-24
  • Contact: HAO XiaoPeng, YANG Tao

Abstract:

【Objective】Salt stress limits the stable and increased yields of faba beans (Vicia faba L.) on saline-alkali soils. This study aims to improve the efficiency and accuracy of distinguishing salt tolerance differences among various materials at early stages by combining indoor germination assays with field observations. Additionally, it evaluates the potential of exogenous itaconic acid (IA) at different doses and acidic treatments to alleviate salt stress during the germination stage, providing complementary pathways for early prediction and exogenous regulation. 【Method】 Fifteen faba bean germplasm materials were selected for germination tests under 100 mmol·L-1 NaCl conditions. Various indices, including relative germination rate (RGR), relative germination energy (RGE), relative root length (RRL), vigor index (VI), germination index (GI), and germination stress index (GSI), were measured. Comprehensive evaluation and classification were performed using the comprehensive membership value μ(Xi). Field trials were conducted on both saline-alkali and non-saline-alkali soils, tracking seedling emergence rate, Soil and Plant Analyzer Development (SPAD) values at the bud stage, flowering-stage salt injury index (SI), and 17 agronomic traits to form a field classification of salt tolerance. Stratified 5-fold cross-validation was employed to assess the performance of field-grade determination, using F1 metrics. For the IA treatment, three representative germplasms were selected, and a gradient of 0% to 1% IA was applied under 100 mmol·L-1 NaCl. Acetic acid (CH3COOH) and pH7.0 treatments served as controls to analyze the alleviating effects of IA on salt stress. 【Result】Significant differences were observed in all indices among the different classifications at the germination stage, showing strong discriminatory power across materials, with comprehensive scores showing a continuous gradient from salt-sensitive to salt-tolerant materials, allowing for classification. Field observations indicated that seedling emergence rates and SPAD values decreased in most materials under saline-alkali conditions, although some materials still performed well. Overall, germination-stage classification correlated well with field classification, with approximately 73% of materials showing consistency across both stages, suggesting that germination assessments are indicative of actual field salt tolerance. A supervised model built on key germination-stage traits (VI, RGE, RGR, and GSI) showed a moderate ability to predict field classification, achieving F1=0.50, Precision=0.46, and Recall=0.60 under stratified 5-fold cross-validation, providing quantitative support for early-stage screening of salt-tolerant germplasm. Low doses of IA (e.g., 0.01%) improved the germination vigor and root growth of the materials, but no similar effect was observed with equimolar acetic acid. When the external solution was adjusted to pH 7.0, the promoting effect of IA significantly weakened or disappeared, indicating that its alleviating effect is not only related to molecular structure but also closely associated with a weak acidic environment. Additionally, the effect exhibited variety-specific responses, with germplasm V434 showing higher responsiveness. 【Conclusion】 The combined evaluation of indoor germination assays and field observations effectively distinguishes salt tolerance differences among faba bean materials at early stages. Indices such as vigor index (VI), germination stress index (GSI), and relative germination rate (RGR) effectively reflect field-grade performance and improve initial screening efficiency. IA demonstrates a dose-dependent, pH-sensitive alleviating effect during germination; however, its stability and applicability need further validation under complex saline-alkali stress and field conditions.

Key words: faba bean, salt stress, salt tolerance screening, multi-indicator evaluation, itaconic acid

Table 1

Main indicators and calculation formulas of faba bean germination period"

发芽率GR 第10天发芽种子数/供试种子数×100% Number of germinated seeds at 10 d/Total tested seeds×100%
相对发芽率RGR 处理发芽率/对照发芽率×100% Germination rate of treatment/Germination rate of control×100%
发芽势GE 第5天的发芽种子数/供试种子数×100% Number of germinated seeds at 5 d/Total tested seeds×100%
相对发芽势RGE 处理发芽势/对照发芽势×100% Germination energy of treatment/Germination energy of control×100%
相对根长RRL 处理根长/对照根长×100% Root length of treatment/Root length of control×100%
活力指数VI 相对根长×相对发芽率×100% Relative root length×Relative germination rate×100%
发芽指数GI Σ(逐日发芽数/相应发芽天数)Σ(Gt/Dt)
萌发胁迫指数GSI 处理发芽指数/对照发芽指数×100%GI of treatment/GI of control×100%
隶属函数值U(Xji) U(Xji)=(Xji-Xjmin)/(Xjmax-Xjmin) XiU(Xij)/n

Table 2

Salt tolerance classification at the germination stage"

等级
Grade
综合隶属函数值μ(Xi)
Comprehensive membership value μ(Xi)
高耐盐HT μ(Xi)≥0.8
耐盐T 0.6≤μ(Xi)<0.8
中耐盐MT 0.4≤μ(Xi)<0.6
弱耐盐S 0.2≤μ(Xi)<0.4
不耐盐HS μ(Xi)<0.2

Table 3

Salt injury rating scale under field conditions"

田间分级Field rating 植株受害状况Plant damage symptoms
1 生长基本正常,没有出现盐害症状Normal growth, no salt damage symptoms
2 生长基本正常,但少数叶片出现青枯或卷缩Growth is basically normal, but a few leaves have withered or curled
3 大部分叶片出现青枯或卷缩,少部分植株死亡Majority of leaves show wilting/curling, with partial plant death
4 生长严重受阻,大部分植株死亡严重受害Severely stunted growth, significant plant death
5 几乎全部死亡或接近死亡Almost complete plant death or near death

Table 4

Experimental group settings for itaconic acid treatment"

处理编号
Treatment ID
处理液配方说明
Treatment solution description
衣康酸浓度
Itaconic acid concentration (mmol·L-1)
醋酸浓度
Acetic acid concentration (mmol·L-1)
组别说明
Group description
CK 纯水 Distilled water 未添加 Not applied 未添加 Not applied 对照 Control
T1 100 mmol·L-1 NaCl 未添加 Not applied 未添加 Not applied 盐胁迫 Salt stress
T2 100 mmol·L-1 NaCl + 0.01%衣康酸
100 mmol·L-1 NaCl + 0.01% itaconic acid
0.77 未添加
Not applied
低浓度衣康酸
Low-concentration itaconic acid
T3 100 mmol·L-1 NaCl + 0.05%衣康酸
100 mmol·L-1 NaCl + 0.05% itaconic acid
3.84 未添加
Not applied
中浓度衣康酸
Medium-concentration itaconic acid
T4 100 mmol·L-1 NaCl + 0.1%衣康酸
100 mmol·L-1 NaCl + 0.1% itaconic acid
7.68 未添加
Not applied
高浓度衣康酸
High-concentration itaconic acid
T5 100 mmol·L-1 NaCl + 1%衣康酸
100 mmol·L-1 NaCl + 1% itaconic acid
76.80 未添加
Not applied
超高浓度衣康酸
Ultra-high-concentration itaconic acid
T6 100 mmol·L-1 NaCl + 0.01%醋酸
100 mmol·L-1 NaCl + 0.01% acetic acid
未添加
Not applied
1.67 低浓度醋酸对照
Low-concentration acetic acid (control)
T7 100 mmol·L-1 NaCl + 0.05%醋酸
100 mmol·L-1 NaCl + 0.05% acetic acid
未添加
Not applied
8.33 中浓度醋酸对照
Medium-concentration acetic acid (control)
T8 100 mmol·L-1 NaCl + 0.1%醋酸
100 mmol·L-1 NaCl + 0.1% acetic acid
未添加
Not applied
16.70 高浓度醋酸对照
High-concentration acetic acid (control)
T9 100 mmol·L-1 NaCl + 1%醋酸
100 mmol·L-1 NaCl + 1% acetic acid
未添加
Not applied
167.00 超高浓度醋酸对照
Ultra-high-concentration acetic acid (control)
T10 T3 + NaHCO3调节pH至7.0
T3 + NaHCO3 adjusted to pH7.0
3.84 未添加
Not applied
pH中性验证(衣康酸)
pH-neutralized itaconic acid (medium concentration)
T11 T5 + NaHCO3调节pH至7.0
T5 + NaHCO3 adjusted to pH 7.0
76.80 未添加
Not applied
pH中性验证(衣康酸)
pH-neutralized itaconic acid (ultra-high concentration)
T12 T7 + NaHCO3调节pH至7.0
T7 + NaHCO3 adjusted to pH 7.0
未添加
Not applied
8.33 pH中性验证(醋酸)
pH-neutralized acetic acid (medium concentration)
T13 T9 + NaHCO3调节pH至7.0
T9 + NaHCO3 adjusted to pH 7.0
未添加
Not applied
167.00 pH中性验证(醋酸)
pH-neutralized acetic acid (ultra-high concentration)

Fig. 1

Phenotypic of 15 faba bean accessions under 100 mmol·L-1 NaCl at the germination stage"

Fig. 2

Comprehensive analysis of salt tolerance in 15 broad bean germplasms at germination stage a: Biplot of principal coordinate analysis (PCoA); b: Differences in RGR, RGE, RRL, VI, and GSI among different salt tolerance types; c: Salt tolerance classification based on the comprehensive membership value μ(Xi). *, **, *** indicate significant differences at P<0.05, P<0.01, and P<0.001, respectively. The same as below"

Fig. 3

Performance of physiological indices during germination and comprehensive salt tolerance evaluation of seven selected germplasms and the control H0001052 under salt stress a: Germination-stage performance of seven candidate faba bean accessions and the control H0001052 under salt stress, based on key physiological indices; b: Comprehensive salt tolerance evaluation based on membership function value μ(Xi)"

Fig. 4

Dynamic salt tolerance performance across growth stages and correlation network of agronomic traits under saline field conditions a: Comparison of seedling establishment rates for 15 faba bean accessions under saline-alkali and non-saline field conditions; b: Response of SPAD values in expanded compound leaves at the budding stage (50 d) under saline-alkali treatment; c: Salt injury index (SI) at flowering and classification of salt tolerance; d: Mantel correlation heatmap among 17 agronomic traits. NFB: Node of first bloom; NFI: Number of flowers per inflorescence; PH: Plant height; EBN: Effective branch number; MSN: Main stem node number; NFP: Node of first pod; TPNP: Total pod number per plant; EPP: Effective pods per plant; SPPFP: Seeds per pod at first pod node; DPL: Dry pod length; DPW: Dry pod width; SNPP: Seed number per plant; SWP: Seed weight per plant; ST: Seed thickness; SW: Seed width; SL: Seed length; SDW: Shoot dry weight"

Fig. 5

Salt tolerance scatter correlation, stratified machine learning cross-validation, and phenotypic classification a: Scatterplot of the relationship between germination-stage comprehensive membership value μ(Xi) and the field salt injury index (SI); b: Stratified cross-validation workflow and results for the machine-learning models; c: Heatmap showing the consistency of salt-tolerance classifications between germination and field stages"

Fig. 6

Phenotypic regulation of faba bean seed germination under salt stress by itaconic acid (IA) treatment"

Fig. 7

The dose-dependent effects, pH sensitivity, and genotype-specific responses of itaconic acid in alleviating salt stress a: Effects of different IA concentrations (0%-1%) on germination-related traits of three faba bean accessions under NaCl conditions (100 mmol·L-1); b: Comparison of germination parameters under equimolar organic acid types and pH treatments; c: Boxplot of relative root length (RRL) for three accessions under key treatments (showing median and interquartile range)"

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