Special Issue: Novel Advances in Agricultural Science and Technology for

Sustainable Farming in Tropical Region

Effect of High-Density Polyethylene, Polyvinyl Chloride and Low-Density Polyethylene Microplastics on Seeding of Paddy

Iswahyudi Iswahyudi1,2, Wahyu Widodo1*, Warkoyo Warkoyo1, Roy Hendroko Setyobudi3, Damat Damat1,

Dyah Roeswitawati1, Shazma Anwar4, Thontowi Djauhari Nur Subchi1, Irma Rahmaita Utarid5,

Marchel Putra Garfansa2, Mohammad Shoimus Sholeh2, Ida Ekawati6, Rusli Tonda7,

Wahyu Alvina Mujianti2, Dody Sukma RA8, Sri Utami Lestari8 and Choirul Anam9

1University of Muhammadiyah Malang, Malang 65144, East Java, Indonesia; 2Universitas Islam Madura, Pamekasan 69317, East Java, Indonesia; 3University of Darma Persada, Capital Special Region of Jakarta 13450, Indonesia; 4University of Agriculture, Peshawar 25130, Khyber Pakhtunkhwa, Pakistan; 5Center Reseach and Diagnostic, Satwa Sehat Indonesia, Malang 65146, East Java, Indonesia; 6University of Wiraraja, Sumenep 69451, East Java, Indonesia; 7PT. Zakiyah Jaya Mandiri, Lumajang 67381, East Java, Indonesia; 8University of Lancang Kuning, Pekanbaru 28265, Riau, Indonesia, 9Universitas Islam Darul Ulum, Lamongan 62253, Indonesia.

Received | July 26, 2023; Accepted | May 18, 2024; Published | July 11, 2024

*Correspondence | Wahyu Widodo, Department of Animal Sciences, Faculty of Agriculture and Animal Science, University of Muhammadiyah Malang, Jl. Raya Tlogo Mas No. 246, Malang 65144, East Java, Indonesia; Email: [email protected]

Citation | Iswahyudi, I., W. Widodo, W. Warkoyo, R.H. Setyobudi, D. Damat, D. Roeswitawati, S. Anwar, T.D.N. Subchi, I.R. Utarid, M.P. Garfansa, M.S. Sholeh, I. Ekawati, R. Tonda, W.A. Mujianti, D.R.A. Sukma, S.U. Lestari and C. Anam. 2024. Sarhad Journal of Agriculture, 39 (Special issue 1): 61-70.

DOI | https://dx.doi.org/10.17582/journal.sja/2023/39/s1.61.70

Keywords | Environmental-friendly, Microplastic pollution, Oryza sativa L., Production reduction, Rice poisoning, Soil contamination

Copyright: 2024 by the authors. Licensee ResearchersLinks Ltd, England, UK.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

Introduction

Microplastics (MPs), which are defined as particles of plastic waste with a size smaller than 5 mm, are considered as emerging contaminants and attract global attention (Putri et al., 2023; Setyobudi et al., 2024a; Wang et al., 2020). In recent years, scientists around the world have observed and investigated the phenomenon of MPs pollution in marine ecosystems, and more recently in inland fresh water, with increasing awareness of its negative impacts (Gentili et al., 2022). However, MPs are rarely investigated, although recent studies have shown that plastic waste may be more abundant in soil than in oceans (Gentili et al., 2022; Iswahyudi et al., 2023). These particles mainly come from the disintegration of plastic mulch, polybag, plastic sacks of fertilizers, harvest sacks, and household waste (Angnunavuri et al., 2020; Setyobudi et al., 2024b). The use of plastic has increased drastically in recent years, accounting for 10 % of the total waste generated worldwide (Lebreton and Andrady, 2019). While some plastic waste is recycled, most of it is in landfills or agricultural land. In general, people often use plastic for various purposes. Of all the types of plastic that have been mentioned. High Density Polyethylene (HDPE), Polyvinyl chloride (PVC) and Low-Density Polyethylene (LDPE) are often found in the surrounding environment where these types of plastics are spread further by airborne (derived from landfills or other surface deposits) (Dong et al., 2020). Airborne plastics can enter the agricultural environment (Setyobudi et al., 2024b). The types of LDPE, PVC and HDPE plastics in the soil can damage soil structure, reduce infiltration of rainwater and irrigation water, and damage groundwater holding capacity. Qi et al. (2020) found that these MPs disturb soil organic carbon (C) and nitrogen (N) cycling, soil microbial activity, and nutrient transfer. Therefore, changes in soil properties and nutrients can also affect plant growth (Garfansa et al., 2024). In their research, Lima et al. (2023) showed that LDPE inhibited germination rate but root length, shoot length and wheat biomass did not experience significant changes.

Paddy rice (Oryza sativa L.) is a food crop as a source of energy which Indonesian people generally consume. The significance of rice is so important that crop failure can result in widespread social upheaval. However, MPs can be toxic to rice seedlings (Wu et al., 2020). Rice seedlings can accumulate MPs in their roots and translocate them to the aboveground tissue, it is possible that MPs that have accumulated in rice plant tissue can be moved to a higher trophic level in the food chain, this can happen when rice plants contaminated with MPs are eaten by animals or humans, so that the MPs enter the organism’s body and move to higher trophic levels in the food chain (Hermayanti et al., 2024; Huang et al., 2021). On the basis of these problems, this research needs to be conducted to determine the effect of the three types of MPs that was often found on the growth of rice seeds.

Materials and Methods

Experimental preparation and treatment

The research was conducted using a soil culture experiment. The treatment included three types of plastic namely HDPE, LDPE, PVC and control as a comparison with four repetitions. Rice planting is carried out in trays made of stainless to reduce the aggregation of other microplastics. The soil used was taken from Banyupelle Village, Pamekasan (East Java province) 7°04’38”S 113°24’15”E, which has a pH of 6 with an organic matter content of 1.21 % (organic matter content is relatively low). The soil was air dried at room temperature and sieved through a 1 mm mesh before use. Three types of plastic were crushed (size 200 μm to 250 μm in diameter) using a blender machine (Sharp Blazter SB-TW101P) and mixed with sterile soil as much as 1 % w w–1 for each treatment. The soil after being treated with plastic is then left for 4 wk and is ready for planting rice seeds. The rice seeds used in this study were the Inpari-32 cultivar

The research in trays aims to evaluate the impact of each type of MPs polymer on rice growth. The treatment consisted of control (original soil), LDPE, PVC and HDPE. MP was given at a concentration of 1 % (w w–1) for each type of polymer. The tray used is 40 cm × 30 cm × 4 cm containing 2 000 g of soil. Water application is given as much as 60 % for 48 h. The seeds were soaked in H2O2 for 30 min. Total of 40 rice seeds were spread into trays for 15 d. A total of 16 trays were available for four treatments and four replications. The observed growth analysis included leaf length, plant height, root length, and total fresh weight.

Determination chlorophyll and identification microplastic

After 15 d of planting, chlorophyll (chl a, chl b, and total chlorophyll) was measured. 0.1 g of fresh leaves from each treatment was weighed. The leaf samples were crushed with a porcelain mortar until smooth and mixed with 10 mL of acetone (C3H6O) solution. The solution is then placed in the tube. Then it is put into a centrifuge so that it can distinguish the extract from the remaining leaves. The extract was put into a cuvette and the absorbance was measured with UV-Vis at a wavelength of 662 nm and 644 nm (Purbajanti, et al. 2019; Zhu et al., 2019). Chlorophyll A, B and total Chlorophyll was calculated using the following Equations 1, 2 and 3, respectively (Purbajanti et al., 2016; Setyobudi et al., 2021).

Identification of MPs was carried out on the roots of plants. The roots of each treatment were added to the solution 20 mL of H2O2 30 % and 10 drops of Fe2SO4. Incubated for 24 h until the sample disintegrates. Then centrifuged to take the supernatant. Supernatant solution in water bath at temperature 70 oC for 30 min. Samples that have cooled in the filter and applied with NaCl. The sample is then ready for identification using a stereo microscope. Identification includes the number of MP and size of the particles attached to the roots (Ullah et al., 2021).

Statistical analyses

The observed data were subjected to ANOVA (analysis of variance) suitable for randomized complete block design (RCBD). If there is a significant effect, then the LSD test (least significant difference) will be applied at the 5 % level to determine the difference between the treatments and the variables observe (Adinurani, 2016, 2022).

Result and Discussion

Effect of microplastics in plant growth

Individual MPs polymer types have different effects on growth factors as leaf length, plant height, and fresh rice weight. All types of MPs suppressed the plant height and leaf length compared to control treatment (P > 0.05) as shown in Figure 1. There was a decrease in plant height of 27 %, 36 % and 20 % for HDPE, PVC and LDPE types compared to the control. The same thing happened to the leaf length variable. Decreasing in leaf length was 28 %, 36 %, and 18 % compared to the control.

 

Previous studies have shown a negative impact of MPs on plant growth. Liu et al. (2021) in his study showed a significant decrease in plant height and leaf length variables in wheat. Plastic on agricultural land can suppress the growth of cultivated plants. Zhang et al. (2020) reported that an increase in plastic mulch at 100 kg ha–1 reduced plant height by an average of 2 %, while plastic film at 317 kg ha–1 reduced leaf length by 6 % to 10 %. This is in line with this study which showed a decrease in plant height and leaf length. Zhang et al. (2020) explained that 100 kg ha–1 of residual plastic can reduce water filtration by 8 %. Decreased groundwater filtration causes plant growth to be stunted. Plants need a large amount of water in the vegetative phase. The water absorbed by the plant was used for the assimilate formation process and passed on to all parts of the plant for the process of cell division. This can also trigger a decrease in root length. Three types of MPs reduce fresh weight (Figure 2).

 

This study showed fresh weight decreased by 20 % (HDPE), 33 % (PVC), and 25 % (LDPE) compared to control. Ingraffia et al. (2022) in his research showed a decrease in fresh weight in corn plants caused by HDPE, PVC, and LDPE. According previous study, HDPE and LDPE can decreased soil pH (Wang et al., 2020) and microbial composition in rhizosphere (Singh and Singh, 2022). Changes in the soil environment due to the presence of MPs can affect soil enzyme activity and N cycle processes (such as nitrification and volatilization) as well as dissolved N accumulation in MPs particles. This can reduce the availability of N and will have a negative impact on plant growth (de Souza Machado et al., 2019). This further causes low used either stored food or food reserves and ultimately reduces plant fresh weight. MPs cannot penetrate the cell wall but can block the pores in the walls between cells which have an impact on the process of transporting nutrients through plant cells causing plants to be unable to carry out their metabolism optimally.

Effect microplastic in root

Root length due to the influence of three types of MPs showed a significant decrease (Figure 3). There was a decrease in root length by 13 % (HDPE), 57 %

(PVC) and 45 % (LDPE) compared to the control. This reduction in root length can be caused by the presence of microplastics in the seed coat or root hairs which inhibit the imbibition of water entering the plant so that it can significantly inhibit root growth (Kalčíková et al., 2017). This revealed that MPs can block water and nutrients from entering through the roots. Bosker et al. (2019) also stated that regarding seed germination and root growth, MPs blocks cell wall pores and inhibits the absorption of water and nutrients thereby disrupting plant physiological processes that ultimately affected plant biomass production.

Previous research also proved that the presence of MPs can inhibit the root growth of maize (Zhang et al., 2021) and wheat (Liao et al., 2019) and even become toxic in rice germination (Dong et al., 2020). However, contrasting results were evident in plants treated with HDPE types. When compared with HDPE root length did not show a significant effect compared to control. This shows that there is a different effect for the type of polymer plastic on root growth. Other variables, including findings from Ma et al. (2022), indicate that PVC MPs have a greater detrimental effect on the metabolism, ionic balance, and growth of food crops compared to polystyrene (PS) counterparts. The results of other studies also showed that the type of HDPE polymer does not significantly reduce overall plant biomass and even showed a stimulatory effect on root growth when a dose of 10 % is applied (Wang et al., 2020). It is different with the types of polymer PVC and PS in most cases which actually can reduce the dry weight of the roots. Figure 4 showed the size and total MPs attached roots plants. The most commonly found sizes range from 0.1 mm to 1 mm. Some of the MPs sizes found in roots include HDPE (0.68 mm to 4.51 mm), PVC (0.47 mm to 1.83 mm), and LDPE (0.02 mm to 0.81 mm). The presence of the amount of MPs in the roots is influenced by the size of the MPs. The smaller the size of the MPs, the higher the chance for MPs to enter through the gaps in the plant roots. This study shows that total number of MPs found in roots is dominated by small MPs.

 

 

Li et al. (2023) in his study showed that there was an increase in the accumulation and distribution of smaller MPs particle sizes in the roots compared to larger MPs particle sizes. Particles that can penetrate into plant tissue are 2 µm in size and some are even distributed to plant xylem tissues. This study did not use fluorescence to see the presence of microplastics that enter through plant cells. However, HDPE, PVC, and LDPE can reduce root growth. The control treatment showed significantly longer root length compared to the plants treated with microplastics (Figure 5).

 

Plastic particles with various physical and chemical properties of different polymers are successively fragmented into different sizes by biological and physicochemical actions (Weithmann et al., 2018). This statement supports the explanation of small impact of HDPE polymer on root length. This is possible because HDPE polymer is fragmented to a larger size compared to PVC and LDPE types. The size of the plastic particles determines their transfer to plants. The size of the HDPE plastic found in the roots is on average > 2 mm so that the impact on the roots has not been seen. The same observation was also revealed in the study by Dovidat et al. (2020) that MPs were found attached to the root area of the Spirodela polyrhiza L. plant but no internalized plastic particles were found. Plastics that have a smaller size have a higher chance of being internalized into plant tissues. Several types of polymer MPs, especially those difficult to decompose into smaller pieces, cannot be absorbed into plants, so they tend to accumulate only on the surface of the roots.

Impact on photosynthesis

In terms of physiology, various studies have shown that the presence of MPs can interfere with the formation of chlorophyll in leaves which in turn inhibits plant photosynthesis. Analysis of chlorophyll content was carried out to evaluate the impact of three types of microplastics on plants. Measurement of Chl a, Chl b, and total Chl in rice plants was carried out at 20 d after emergence (Figure 6). The results showed the effect of the three types of MPs on Chl a, Chl b, and total Chl. The three types of polymers reduce the chlorophyll content in the leaves. This indicates that the types of HDPE, PVC and LDPE polymers have an impact on considerable damage to the photosynthetic system of paddy. The presence of HDPE, LDPE and PVC directly causes a decrease in photosynthetic pigments (Figure 6).

 

This is similar to the results (Colzi et al., 2022). In his research, MPs can reduce the total chlorophyll concentration in corn plants. Gao et al. (2021) also added that there was a decrease in leaf chlorophyll in lettuce (Lactuca sativa L.) after adding MPs. The presence of MPs on the leaf surface can also trigger an inhibition of photosynthetic activity due to clogged leaf stomatal pores and other cellular activities in plants.

Further research need to be conducted to study the impact of MPs pollution in soils with moderate or high organic matter content as ours. research was conducted with 1.2 % organic soil, categorized as low (Adinurani et al., 2023; Ekawati, 2019; Prasetyo et al., 2022a). Organic materials play an essential role for plants (Pramulya et al., 2023; Prasetyo et al., 2022b; Sumantra et al., 2023; Vincevica-Gaile et al., 2021a, b), including chelating heavy metals (Goenadi et al., 2021; Ekawati et al., 2024; Shinta et al., 2021; Zhou, 2020), among others, from polymer decomposition (MPs).

Conclusions and Recommendations

This research clearly shows that the presence of HDPE, LDPE, and PVC MPs polymers in soil can cause growth disorders to rice plants. HDPE types showed no effect on root elongation compared to LDPE and PVC although all types of MPs still reduced plant growth, chlorophyll and fresh weight. HDPE types tend to take longer to fragment into smaller plastic sizes than other MPs, so they have not accumulated thoroughly in the roots.

Acknowledgement

Research up to the publication of this manuscript was supported by personal funds from several researchers from various institutions. The authors express their gratitude for the mutually beneficial collaboration, especially to Yenni Arista Cipta Ekalaturrahmah, who has helped prepare this manuscript.

Novelty Statement

The effects of MPs on various crops such as sweet potato, carrot, wheat, tomato, lettuce, corn, peas, chicory, and paddy-rice have been reported. However, the above plants’ findings focused primarily on plastic particles’ effect on biochemical properties, growth, and yield. In contrast, their impact on seed germination, a sensitive and critical stage in the plant life cycle, has yet to be investigated. In addition, several studies have not evaluated the growth disorders of MPs in food commodities such as paddy rice.

Author’s Contribution

Iswahyudi Iswahyudi: Conceptualized and designed the study, elaborated the intellectual content, performed literature search, manuscript preparation, and manuscript revision.

Wahyu Widodo and Warkoyo Warkoyo: Research supervision, and elaborated the intellectual content.

Roy Hendroko Setyobudi: Elaborated the intellectual content, performed the literature search, manuscript review and revision, Grammarly check, Turnitin check, and guarantor.

Dyah Roeswitawati, Thontowi Djauhari Nur Subchi, Irma Rahmaita Utarid: Performed the literature search.

Marchel Putra Garfansa and Mohammad Shoimus Sholeh: Statistical analysis, and figure.

Rusli Tonda: Administration and layout to template SJA

Wahyu Alvina Mujianti: Provider of research tools and materials.

Damat Damat, Dodi Sukma RA, Sri Utami Lestari, and Choirul Anam: Manussript review

All authors have read and approved the final manuscript.

Conflict of interest

The authors have declared no conflict of interest.

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