Effects of microplastics addition on seedling growth and dry matter distribution of two wheat varieties

doi:10.7522/j.issn.1000-694X.2022.00081

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (1): 142-149.DOI: 10.7522/j.issn.1000-694X.2022.00081

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Effects of microplastics addition on seedling growth and dry matter distribution of two wheat varieties

Yucheng Xiao¹(), Yanlei Du¹^,²^,³(), Yongxian Zhou², Lixue Wei², Qucuo Ciwang¹

^1.School of Ecology /, Lanzhou University，Lanzhou 730000，China
^2.School of Life Sciences /, Lanzhou University，Lanzhou 730000，China
^3.State Key Laboratory of Grassland Agro-ecosystems, Lanzhou University，Lanzhou 730000，China

Received:2022-04-14 Revised:2022-05-13 Online:2023-01-20 Published:2023-01-18
Contact: Yanlei Du

Abstract

Abstract:

Microplastics accumulation and pollution in soil has become a global environmental issue in the world.Many researches on the direct impact of micro plastics on plant growth and the indirect impact due to the changes of soil physical and chemical properties has been gradually carried out， but the research on the impact of different wheat varieties in the drylands is rarely reported.Two native dryland-planted wheat varieties （Ganchun 27 and Heshangtou） was as the selected research objects.High-density polyethylene with three mass concentrations （0， 1 and 4 g·kg^-1） as the microplastics type were added for the wheat pot experiments under natural environmental conditions.The seed emergence rate， plant height， whole plant dry biomass and the under- /aboveground dry matter distribution rate of wheat under different soil micro plastic additions were analyzed during the seedling stage.The results showed that：（1） the addition of micro plastic had no effect on the emergence rate of the two varieties.（2） The whole-wheat biomass of Heshangtou variety was 46.7% and 8.5% higher than that of 0 g·kg^-1 and 4 g·kg^-1， respectively.The whole-wheat biomass of Ganchun 27 variety was 28.7% and 17.2% higher than that of 0 g·kg^-1 and 4 g·kg^-1， respectively.The whole-wheat biomass of Ganchun 27 wheat was 24.9%， 9.6% and 1.5% higher than that of Heshangtou wheat under the three concentrations， respectively.（3） Under different experimental treatment conditions， Ganchun 27 wheat had more dry matter distribution in the aboveground （stem and leaf）， and the rates of under-/above-ground are lower than Heshangtou wheat.In the whole， the moderate micro plastic addition can promote wheat growth and dry matter accumulation by improving soil environment， and Ganchun 27 had stronger stress resistance than Heshangtou wheat variety due to the results of the dry matter distribution between the roots and stem and leaf.This research results have certain scientific value for the risk assessment and stress resistant variety selection of micro plastics in crop soil ecosystem.

Key words: microplastics, wheat varieties, pot experiment, seedling growth, dry matter distribution

CLC Number:

S512.1

Yucheng Xiao, Yanlei Du, Yongxian Zhou, Lixue Wei, Qucuo Ciwang. Effects of microplastics addition on seedling growth and dry matter distribution of two wheat varieties[J]. Journal of Desert Research, 2023, 43(1): 142-149.

Figures/Tables 5

Table 1 Seedling emergence rate of two wheat varieties under the micro plastic addition treatments

小麦品种	微塑料的质量浓度/(g·kg^-1)	出苗率/%
甘春27	0	91.67
	1	98.96
	4	93.75
禾尚头	0	93.75
	1	98.96
	4	96.88

Fig.1 Effects of different microplastics on plant height， whole plant dry biomass and rate of under-/above-ground biomass of the same wheat variety at its seedling stage

Fig.2 Effects of micro plastic addition on plant height， whole plant dry biomass and rate of under-/aboveground biomass of different wheat varieties at its seedling stage

Fig.3 Whole dry biomass allocation of two wheat varieties under three micro plastic addition treatments at seedling stage

Table 2 Results of two-factor analysis of variance

差异源	株高	全株生物量	地上部分生物量	地下部分生物量
品种	0.265	0.001	0.911	0.037
浓度	0.036	0.057	0.024	0.357
品种×浓度	0.739	0.099	0.235	0.434

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Effects of microplastics addition on seedling growth and dry matter distribution of two wheat varieties

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