scholarly journals Effects of Complex Heavy Metal Stress on the Hydrodynamic Parameters, Stem Anatomy and Photosynthetic Properties of Three Desert Species in the Jinchang Mining Area

2021 ◽  
Author(s):  
Tian Peng Gao ◽  
Hao Ming Wang ◽  
Changming Li ◽  
Mingbo Zuo ◽  
Xueying Wang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Heavy Metal Stress ◽  
Mining Area ◽  
Metal Stress ◽  
Kochia Scoparia ◽  
Stem Anatomy ◽  
Hydrodynamic Parameters ◽  
Native Soil

Abstract PurposeThe physiological mechanism and phytoremediation effects of heavy metal pollution by local desert plants, namely, Kochia scoparia, Chenopodium glaucum and Atriplex centralasiatica, around tailings were investigated. MethodsTwo different types of local soils (native soil and native soil + tailings, which are labeled CK and T, respectively) were used for potting experiments in the open, and the photosynthesis performance, chlorophyll content, hydraulics and stem anatomy of the potted plants were analyzed. The collection of soil samples has been approved by the soil resources management department of the local government.ResultsIt was found that the chlorophyll content, photosynthetic rate and transpiration rate decreased but the chlorophyll a and b (Chl a/b) and intercellular CO2 concentration (Ci) values increased in Kochia scoparia under complex heavy metal stress. Nonstomatal restriction led to a decrease in the net photosynthetic rate (Pn) and damage to the chloroplasts. Additionally, four hydrodynamic parameters were elevated under heavy metal stress along with a decrease in duct density and diameter and a significant thickening of the duct wall. Under heavy metal stress, the changes in the chlorophyll parameters of Chenopodium glaucum, Atriplex centralasiatica and Kochia scoparia exhibited the same pattern, with stomatal restriction causing a decrease in Pn and Ci and a significant increase in the leaf specific conductance, hydraulic conductivity, and duct diameter. ConclusionsAtriplex centralasiatica is the dominant desert plant in the region and demonstrates good adaptability and heavy metal accumulation under the stress of heavy metal tailings; therefore, it is a good candidate for tailings remediation in the Jinchang desert mining area.

scholarly journals Impact of lead on the amount of chlorophyll and carotenoids in the leaves of Triticum durum and T. aestivum, Hordeum vulgare and Avena sativa

2021 ◽  
Vol 29 (3) ◽  
pp. 207-210
Author(s):  
H. Souahi
Keyword(s):  
Heavy Metal ◽  
Hordeum Vulgare ◽  
Chlorophyll Content ◽  
Avena Sativa ◽  
Lead Acetate ◽  
Triticum Durum ◽  
Photosynthetic Apparatus ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Cereal Species

Lead is one of the most dangerous pollutants to both the environment and humans. It causes structural changes in photosynthetic apparatus and reduced biosynthesis of chlorophyll pigments inhibits carbon metabolism. The aim of our study was to determine the dynamics of photosynthetic pigments in leaves of wheat (Triticum durum and T. aestivum), barley (Hordeum vulgare) and oats (Avena sativa) at different lead acetate, Pb(CH3COO)2 levels: 0, 0.15, 0.30 and 0.60 g/L. The results of this research indicate that these concentrations significantly affected chlorophyll content of H. vulgare and A. sativa as compared to T. durum and T. aestivum. Analysis of variance showed that lead concentration and interaction between cereal species had a significant effect on all chlorophyll characteristics at 0.1% probability and on carotenoids contents at 1% significance. Lead acetate in 0.3 and 0.6 g/L concentrations had a highly significant effect on chlorophyll a, b and carotenoids in H. vulgare seedlings, its carotenoid contents increased from 0.002 mg/g FW at 0 g/L to 0.107 mg/g FW at 0.6 g/L, whereas its chlorophyll content decreased under heavy metal stress, corresponding to the concentration of the metal ion. Carotenoids of A. sativa were not affected compared to Chl a and Chl b, while higher concentrations significantly increased chlorophyll contents of the seedlings from 1.384 mg/g FW of total chlorophyll at 0 g/L to 1.883 mg/g FW at 0.6 g/L. The increased amount of carotenoids was indicative of the formation of free radicals in plants under heavy metal stress, while decreased levels of chlorophyll content were an indication of reduction in the growth of the plants leading to decrease in the yield. It is suggested that chlorophyll content can be adopted as a very useful in vivo indicator of heavy metal toxicity.

Effects of Metal Stress on Visible/Near-Infrared Reflectance Spectra of Vegetation

2011 ◽  
Vol 347-353 ◽  
pp. 2735-2738 ◽  
Author(s):  
Guang Yu Chi ◽  
Yi Shi ◽  
Xin Chen ◽  
Jian Ma ◽  
Tai Hui Zheng
Keyword(s):  
Heavy Metal ◽  
Structural Changes ◽  
Near Infrared ◽  
Leaf Surface ◽  
Spectral Response ◽  
Spectral Characteristics ◽  
Surface Characteristics ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Near Infrared Reflectance

Vegetation which suffers from heavy metal stresses can cause changes of leaf color, shape and structural changes. The spectral characteristics of vegetation leaves is related to leaf thickness, leaf surface characteristics, the content of water, chlorophyll and other pigments. So the eco-physiology changes of plants can be reflected by spectral reflectance. Studies on the spectral response of vegetation to heavy metal stress can provide a theoretical basis for remote sensing monitoring of metal pollution in soils. In recent decades, there are substantial amounts of literature exploring the effects of heavy metals on vegetation spectra.

Sign in / Sign up

Export Citation Format

Share Document