This study evaluated the effect of flaxseed polymer and its combination with quercetin on green gram seeds by analysing physical, physiological and biochemical parameters. The aim was to enhance the planting value of green gram seeds using these treatments.
Physical parameters
The results showed no significant differences in seed physical parameters like thousand seed weight and moisture content among treatments. Flaxseed polymer formed a thin film around the seeds, maintaining their shape and weight (Table 1).
Physiological parameters
Flaxseed polymer infused with quercetin @ 1% significantly increased seed germination (98%) compared to control (82%) (Table 2). This treatment also reduced abnormal seedlings due to the presence of quercetin - a plant growth-promoting substances in the polymer, which enhances cell elongation
(Wianowska et al., 2022). Also, quercetin has strong antioxidant properties which was confirmed by HPLC study at a peak range of 10.38 and 10.34 as reported by
Hem et al. (2024) that will indirectly promotes the root growth under laboratory conditions. Quercetin acts as a scavenger, improving germination by reducing abnormal seedlings and dead seeds
(Yang et al., 2021), Quercetin helps plants to tolerate stress
(Singh et al., 2024) by improving osmoregulation. The presence of quercetin @ 1% influences processes like photosynthesis, hormone production, antioxidant renewal and cell division
Foyer et al., (2024). The flaxseed polymer with quercetin significantly increased speed of germination, shoot and root length, dry matter production and vigour index (32.99, 16.6 cm, 19.1 cm, 0.216 g and 3499, respectively) (Tables 1 and 2). Quercetin also improved root fresh weight and length in various plants and enhanced root/shoot length by boosting chlorophyll content and photosynthesis
(Yoon et al., 2021).
Biochemical parameters
Seeds treated with flaxseed polymer infused with quercetin @ 1% showed a significant increase in antioxidant enzyme activity with peroxidase at 3.89DOD 430 mg
-1 min
-1 and catalase at 20.77 μg H
2 O
2/min/mg protein compared to control values (3.76 D OD 430 mg
-1 min
-1 and 20.32 μg H‚ O
2 /min/mg protein) (Table 3).
Tewari et al. (2023) observed increased catalase and peroxidase activity in safflower under drought stress when treated with polysaccharide-based polymers. Also, increased enzyme activity was due to the presence of nutraceutical property in quercetin and was reported by
Mundhe et al. (2016) in aonla
juice and Richika et al. (2022) over value added products of grapefruit (
Citrus paradisi).
Scanning electron microscopy (SEM) analysis of the seed surface
No significant differences were observed in the seed coat structure between flaxseed polymer-coated and control seeds. Coated seeds recorded a length and breadth of 3.998 mm and 2.968 mm while control seeds measured 3.774 mm and 2.769 mm (Fig 3).
Degradability of organic polymer
Concerns about polymers arise from their lack of degradability, landfill closures and pollution emphasizing the need for biodegradable options. Studying flaxseed polymer’s degradability is crucial. The degradability of polymer was studied by assessing the soil pH, EC and organic carbon content that will decide the period for complete disintegration in soil
(Sonkaria et al., 2022).
The biodegradability of flaxseed polymer was tested in soil under 60% moisture condition. Weight loss of polymer showed increased degradation over time and complete degradation were recorded in seven weeks for 1% quercetin and eight weeks for 2% concentration (Table 4). Slower degradation of polymer is due to preservative, colourant and active component, which are higher molecular weight compounds that degrade more slowly
(Senesi et al., 2007).
The soil properties, including pH, EC and organic carbon, were affected by flaxseed polymer. Soil pH decreased from 7.88 to 7.60 with flaxseed polymer, 7.72 with 1% quercetin and 7.53 with 2% quercetin. EC increased from 0.51 to 0.61 with flaxseed polymer, 0.63 with 1% quercetin, and 0.59 with 2%. Organic carbon rose from 0.56 to 0.60, 0.84 and 0.74 with flaxseed polymer, 1% and 2% quercetin (Table 5), possibly due to the active compounds acting as biostimulant (
Alagoz and Yilmaz, 2009). This shows flaxseed polymer with 1% quercetin is fully degradable without harming soil health.
Physiological attributes under field condition
Plant height
Plants from treated seeds were observed with increased height at 20, 40 and 60 days after sowing compared to control. Notably, treatment with flaxseed polymer+Quercetin @ 1% showed significant height increases (11.7, 27.0 and 36.6 cm). Quercetin enhances root elongation and branching by interacting with auxins and cytokinin, crucial for root development and improves the availability of essential nutrient to the meristematic tissue of the plants even under stress condition as reported by
Xu et al. (2020).
Days to 50% flowering
Treatments showed no significant effect on days to 50% flowering, but flaxseed polymer infused with quercetin @ 1% led to earlier flowering (58 DAS) (Fig 4). Quercetin likely improved root architecture, allowing better access to water and nutrients under stress.
Agati et al. (2012) reported similar results with quercetin-treated maize showing improved root structure and drought tolerance.
Leaf area index
Results showed significant differences in treatments and their interaction with drought stress condition up to 20 days after sowing with flaxseed polymer infused with quercetin @ 1% (0.140) (Table 6). Quercetin aids in the synthesis of secondary metabolites, crucial for plant defence and resilience against pathogens
(Santos et al., 2019).
Chlorophyll content
Flaxseed polymer infused with quercetin @ 1% showed no significant differences in chlorophyll content at flowering stages of green gram under field conditions. However, at the vegetative stage (20 DAS), a significant increase in chlorophyll content (44.6) was observed (Table 6) due to antioxidant properties by
Nirbhay et al. (2023).
Yield attributes under field condition
Pod yield
Significant differences in pod yield (15.91 g/1.36 kg/1126 kg/ha) were observed in the treatment with flaxseed polymer infused with quercetin @ 1% (Table 7). Quercetin’s antioxidant properties likely protected root cells from oxidative damage
Zhang et al. (2020) and the percentage of quercetin will be varied based on the nature of soil and that will influence over the final pod yield by
Patil et al. (1995).
Seed yield
Seed yield significantly increased in flaxseed polymer infused with quercetin @ 1%, with yields of 8.92 g/0.758 kg/631.6 kg/ha and a seed recovery rate of 56.54% (Table 8). Quercetin modulates root growth by interacting with auxins and cytokinin essential for root development by
Tariq et al., (2023).