Effect of Foliar Applied Tryptophan on Tuberose Plants for Decreasing the Harmful Effect of Some Heavy Metals Pollution in the Irrigation Water (B) Effect of Lead Treatments

Nader A El-Shanhorey ,Samira S Ahmed

doi:10.21608/eajbsh.2021.159664

Abstract

The present study was carried-out at Antoniadis Research Branch, Horticultural Research Institute, Agriculture Research Center (ARC), Alexandria, Egypt during two successive seasons of 2018 and 2019. The aim of this study was to evaluate the effects of irrigation water contaminated with lead on the growth of Polianthes tuberosaplants and the possibility of using tryptophan spray treatments to overcome the effects of lead pollution. Corms of Polianthes tuberosawere planted individually in plastic pots (20 cm diameter) filled with 5 kg of sandy soil. The lead-contaminated irrigation water treatments were 0,100, 200 and 300 mg/L were applied. The plants were also monthly sprayed with tryptophan at concentrations of 0, 250 and 500 mg/L. The results showed that for vegetative growth parameters there was no significant difference in the interaction between lead polluted water of irrigation and foliar spray by tryptophan, while a significant reduction was observed in all parameters after irrigation with lead polluted water and a significant increase in vegetative growth parameters was observed after 500 mg/L tryptophan application. For chlorophyll and carbohydrate content, the highest significant value was obtained in plants irrigated with tap water and sprayed with 250 mg/L tryptophan while the highest significant level of lead content in leaves and corms was obtained due to treatment by 300 mg/L lead without application of tryptophan.

Highlights

Phytoremediation has become an effective and affordable technological solution used to extract or remove toxic metals from polluted soil
In this study Polianthes tuberosa was selected due to its characteristics as non-edible plant, cut flowers and it has many uses in landscaping, the objective of this study is to determine the potential of Polianthes tuberosa in removing heavy metals from the soil affected with contaminated irrigation water and to investigate the ability of Polianthes tuberosa in removing heavy metals
Vegetative Growth: 1-Leaves Parameters: Data presented in Table (3) Showed that, in both seasons, irrigation water polluted with lead decreased the leaves parameters of Polianthes tuberosa plants

Summary

Introduction

Phytoremediation has become an effective and affordable technological solution used to extract or remove toxic metals from polluted soil. Phytoremediation is the use of plants to clean polluted soils, sediments and water. This technology is environmentally friendly and potentially cost-effective. Plants need trace amounts of heavy metals but their excessive availability may cause plant toxicity (Sharma et al, 2006). The phytotoxic concentration of heavy metals referred in the literature does not always specify the levels (Wua et al, 2010). Proceedings of the National Academy of Science, 108, 18518-18523. A critical review on the bio-removal of hazardous heavy metals from contaminated soils: Issues, progress, eco-environmental concerns and opportunities.

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