Effects of aqueous Moringa oleifera leaf extract on growth performance and accumulation of cadmium in a Thai jasmine rice-Khao Dawk Mali 105 variety.

Choowong Auesukaree,Sirin Sirirakphaisarn,Patompong Johns Saengwilai,Jutamas Bussarakum

doi:10.1007/s11356-022-19194-y

Choowong Auesukaree, Sirin Sirirakphaisarn + Show 2 more

Open Access

https://doi.org/10.1007/s11356-022-19194-y

Copy DOI

Abstract

The contamination of paddy fields and rice grains by cadmium (Cd) adversely affects human health. Thus, many approaches have been proposed to reduce the accumulation of Cd in rice. Here, we investigate the potential of aqueous Moringa oleifera leaf extract (AMOLE) in decreasing uptake and toxicity of Cd in a popular Thai jasmine rice variety, Khao Dawk Mali 105 (KDML105). Plants were grown in Petri dishes, a hydroponic system, and a pot system under different concentrations of Cd, in the presence and absence of AMOLE. In Petri dishes, Cd reduced the percentage of germination by 79%, but the treatment with 0.5mgmL-1 AMOLE significantly increased the germination percentage. Moreover, AMOLE significantly decreased Cd accumulation in rice seedlings by 97%. In the hydroponics system, 0.5mgmL-1 AMOLE decreased Cd content in shoots by 48%. Although no significant physiological changes in response to Cd treatments were observed in the pot system, a large amount of Cd was accumulated in rice roots. The AMOLE treatments significantly reduced Cd accumulation in rice shoots and decreased Cd content in milled grain by half compared to those without AMOLE treatment. We conclude that AMOLE reduced Cd toxicity, enhanced seedling growth, and reduced Cd accumulation in rice grains.

Highlights

Rapid urbanization and industrialization are among the major causes of pollutant contamination in the environment
We investigate the potential of aqueous Moringa oleifera leaf extract (AMOLE) in decreasing uptake and toxicity of Cd in a popular Thai jasmine rice variety, Khao Dawk Mali 105 (KDML105)
Without AMOLE supplementation, shoot mass was drastically reduced by 97% compared to the control

Summary

Introduction

Rapid urbanization and industrialization are among the major causes of pollutant contamination in the environment. Plants can uptake toxic elements present in the soils and accumulate them in edible parts consumed by animals and humans. The intake of contaminated crops and vegetables has become a major source of public health problems in several countries (Chaney 2015). The contamination of rice by toxic elements, cadmium (Cd), has been shown to be an important factor contributing to acute and chronic diseases in humans (Chaney 2015; Wang et al 2021). Cadmium contamination in soil occurs from both natural and anthropogenic sources. The major anthropogenic sources of Cd include mining activities, phosphate fertilizers, and industrial emissions (He et al 2005). Sediments and irrigating water originating from a contaminated water reservoir cause contamination, since the land is often continuously irrigated by local surface water (Charoenpanyanet and Huttagosol 2020)

Objectives

Methods

Results

Discussion

Conclusion