The present study stands out for its original approach of systematically evaluating and comparing the effect of various priming agents, chemical (KNO
3, PEG...) and vitaminic (ascorbic acid), under saline conditions, with the aim of identifying the most effective priming strategy for resilience of
Lens culinaris Medik. to saline stress at germination and seedling growth (Table 1).
Fig 1 (A) illustrates the time required to reach 50% germination, indicating that most controlled treatments reach a threshold of two (02) days. While under saline stress, we observe a slight extension of time, reaching 3 days, especially for unprimed seeds and KH
2PO
4 (3%) with a germination rate of 12.5% and 37.5% respectively. However, treatments with KH
2PO
4 (1%), ascorbic acid 0.1 mmol and 0.6 mmol maintain rapid germination under saline stresswith a germination rate of 65%, 75% and 47.5% respectively. These results indicate that priming promotes germination even under saline stress.
Our results confirm previous studies indicating that saline stress significantly reduces the germination of cowpea
(Nabi et al., 2017); Ivory Coast bean
(Camara et al., 2018), faba bean (
Chaker-haddadj et al., 2014), pea
(Petrović et al., 2016) and lentil (
El-Monemand Sharaf, 2008). These studies reported a delay in germination and a reduction in the germination rate due to both osmotic effects and specific ionic toxicity, which inhibited the mobilization of seed reserves and altered enzymes and hormones in the seeds
(Farissi et al., 2011; Farooq et al., 2015; Nabi et al., 2025).
The results of the germination stability analysis illustrated in Fig 1 (B) present the coefficient of variation as an indicator of germination stability. Lower values indicate more consistent growth. Under saline stress, the coefficient of variation increases. The PEG, KH
2PO
4 (1%) and ascorbic acid (0.1 mmol) treatments maintain relatively low coefficients of variation (10%-15%), which suggests increased stress tolerance.
ANOVA test results
The analysis of variance (Table 2) shows significant results for the three studied factors (F=24.962 and P<0.001) and the type of priming reveals a highly significant effect (F=11.4, P<0.001). The interaction between treatment and priming is significant at the 5% threshold (F=2.581, P=0.0428), which means that the type of priming varies depending on the treatment used.
After a significant ANOVA, the Turkey (HSD) test was applied to compare the germination rates among the different types of priming. The results of the Tukey HSD test (Fig 2A) indicate that ascorbic acid (0.1 mmol) and ascorbic acid (0.6 mmol) show the highest germination rates, exceeding 80%. On the other hand, PEG (10%) and KH
2PO
4 (3%) show lower rates (50%-60%).
Lentil germination decreases under salt stress (Fig 2B), primarily due to increased production of reactive oxygen species (ROS) and an accumulation of Na+/Cl- ions, which disrupt cellular ionic balance and embryonic physiological processes
(Hasanuzzaman et al., 2021; Munns and Tester, 2008). However, some treatments, such as KH
2PO
4 (1%) and ascorbic acid, maintain a high germination rate. Ascorbic acid, in particular, reduces lipid peroxidation and stimulates the activity of antioxidant enzymes (peroxidase, catalase), thus mitigating the effects of oxidative stress
(Ghiyasi et al., 2025). Conversely, PEG and KH
2PO
4 (3%) prove ineffective under these conditions.
Effect of priming types on growth parameters
The results of different types of priming on the growth parameters of lentils reveal that (0.1 mmol) ascorbic acid is the most effective, particularly under saline stress conditions, with radicle length values of 62.16 mm and a vigor index of 931.5 (Table 3). Ascorbic acid (0.6 mmol) has a notable effect on all growth parameters under both normal and saline conditions at T
0 and T
1. Our results are consistent with the majority of previous studies
(Ishaq et al., 2021; AL-Kazzaz, 2023).
On the other hand, treatments with KNOƒ (1.5%, 3%) show the lowest performance with a decrease in the total length of the seedlings with a value of (34.24 mm and 42.99 mm) and a vigor index of (163.3 and 105.87) respectively.
The results of the analysis of variance on the different growth parameters (Table 4) show that salt stress and priming have a highly significant effect on each growth parameter. We observe that saline stress affects the radicle length (F=15.35 and P<0.001), the epicotyl length (F=11.39, P=0.001), as well as the total length (F=11.45, P=0.001) and the vigor index (F=2.892, P=0.003), indicating a generalized inhibition of lentil seed growth.
Priming has a notable effect on all growth parameters (p<0.05) and significant F values, particularly for epicotyl length (F=26.3). This indicates that the type of priming differently influences the resumption of seedling growth. However, the interaction is not significant for the total length (F=1.6, P=1.159), which suggests that the overall growth response remains constant despite the variations specific to each organ.
Tukey’s (HSD) test
The results of the Tukey HSD test (Fig 3) show a significant difference between the different types of priming, both in terms of root length, epicotyl length, total length and vigor index. Ascorbic acid 0.1 mmol shows a high-performing result in terms of radicle length (62 mm), epicotyl length (65 mm), total length (118 mm) and vigor index (1050). It is followed by (0.6 mmol) ascorbic acid, which exhibits an epicotyl (72 mm) and vigor index (1150). These results indicate that ascorbic acid is a crucial antioxidant that significantly improves plant resilience to stressful conditions and corroborate the results of
Sutnga et al., (2020); Shah et al., (2025).
The unprimed control shows high values, although slightly lower (radicle 60 mm, vigor (1000)). In contrast, the treatments with PEG (10%), KNO
3 (1.5%) and KNO
3 (3%) exhibit lower values.
Under saline stress, the Tukey HSD test indicates that various types of priming maintain a positive effect on growth (Fig 4). For the length of the radicles, the best results were recorded with ascorbic acid (0.6 mmol) (75 mm), followed by ascorbic acid (0.1 mmol) (60 mm) and KH
2PO
4 (1%) (45 mm), while the other treatments showed low values, indicating an inhibitory effect on root growth.
Regarding the length of the epicotyl, ascorbic acid (0.1 mmol) remains dominant with a value of 70 mm. On the other hand, all other types of treatment show low values that do not exceed 25 mm. The seedlings imprinted with KH
2PO
4 (1%) and ascorbic acid (0.1 mmol) exhibit higher lengths, reaching 80 mm, 70 mm and 65 mm, respectively. The vigor index is significantly higher for ascorbic acid (0.1 mmol) (900), followed by PEG (600) and KH
2PO
4 (40), while the other treatments are less effective.
The results obtained are similar to those reported by
Zhang et al., (2024) and
Prajapati et al., (2025), who consider ascorbic acid to be one of the essential metabolites involved in cell division and osmotic adjustment and possess a strong antioxidant capacity by reinforcing defense enzymes against oxidative stress and reducing the generation of free radicals, thus facilitating the balance between the production and recovery of ROS (reactive oxygen species)
(Zulfiqar et al., 2022). And also, the application of ascorbic acid mitigated photoinhibition and reduced the deleterious effects on photosynthesis by stimulating chlorophyll synthesis and decreasing oxidative stress at the chloroplast level through the control of the redox state in the latter and the dissipation of excitation energy in the PSII antennas
(Chen et al., 2021).