Comparison of Fine and Coarse Rice Varieties for Nickel Accumulation and Growth Response at Different Levels of Nickel

Abstract

The differential growth response and nickel (Ni) accumulation by two rice varieties grown in Ni-contaminated soil are investigated. Soil is contaminated with Ni at different levels viz. control (0), 7, 15, 22, 30, and 38 mg kg −1 soil. Two rice varieties viz. Basmati-2000 (fine variety) and KSK-133 (coarse variety) are grown in pots containing Ni-contaminated soil. The plants are harvested at four growth stages with an interval of 15 days. Harvested plants are washed with distilled water to remove aerial deposition. Harvested plants are oven-dried, weighed, grinded, and digested with di-acid mixture. The digested samples are analyzed for Ni, zinc (Zn), and manganese (Mn) concentration. The results indicate that the maximum level of Ni (38 mg kg −1 ) inhibits the shoot and root growth. The maximum shoot and root dry weights are observed at lower level of Ni, that is, 7 mg kg −1 . The concentration of Ni in plants increases with increasing Ni levels compared to control while the concentration of Zn and Mn decreases with increasing Ni levels. The maximum concentrations of all elements are recorded at the first harvest which gradually decrease in the subsequent harvests. It is concluded that Basmati-2000 is tolerant to Ni toxicity compared to KSK-133.

Nitrogen Forms Modify Growth Response and Accumulation of Potentially Toxic Elements by Wheat Genotypes in Nickel‐Contaminated Soil

“…Higher Ni concentration in plants affects the concentration of Zn, Mn, and Cu. Fatima et al [46] concluded that higher Ni concentration in plants modified the ionic composition (Zn, Mn, and Cu) of rice varieties. Nickel decreased Mn and Cu concentrations in maize shoots while the Zn concentration increased.…”

“…Potentially toxic elements are accumulated in agricultural soils through natural as well as anthropogenic sources. [1][2][3] Potentially toxic elements adversely affect agroecosystems leading to loss of high-quality farmlands, pollution of DOI: 10.1002/clen.202100231 natural resources, and low-quality grazing lands. Soil contamination with PTEs decreases crop and livestock production, groundwater pollution, enhanced demand for clean water, contamination of urban areas and increased public health problems, low grazing quality of rangelands, decreased crop yields and livestock production.…”

“…[13] Plant factors that affect Ni availability are physical processes such as root intrusion, water, and ion fluxes and their relationship to the kinetics of PTE solubilization in soils, the metabolic fate of absorbed ions, biological parameters, the kinetics of membrane transport, and the ability of the plant to adapt stress of PTEs in the environment. [14] The existence of genetic differences in uptake and accumulation of PTEs, as well as tolerance has been found in diverse crop plants, [3,15] indicating the possibility of developing as well as selecting suitable cultivars for planting in the contaminated soil.…”