Zinc-Induced Changes in Morpho-Physiological and Biochemical Parameters in Artemisia annua

Khudsar, Tarannum; Mahmooduzzafar,; Iqbal, Muhammad; Sairam, R. K.

doi:10.1023/b:biop.0000033453.24705.f5

Cited by 73 publications

(33 citation statements)

References 31 publications

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“…While deficiency of zinc may cause significant changes in plant metabolism, resulting in growth retardation and chlorosis, its excess accumulation makes shoots stunted and chlorotic (Mahmooduzzafar et al 2003;Khudsar et al 2008). High zinc concentration may inhibit photosynthesis and NR activity (Khudsar et al 2004(Khudsar et al , 2008 and also induce callose deposition on sieve plates in the phloem (Peterson & Rauser 1979), thus affecting the transport of photosynthates. Balsberg (1989) suggests that during biosynthesis of chlorophyll, zinc must compete with iron, leading to chlorosis, which is often attributed to iron deficiency.…”

Section: Discussionmentioning

confidence: 99%

Coal-smoke pollution modifies physio-chemical characteristics of tissues during the ontogeny of Peristrophe bicalyculata

2008

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Coal-smoke emissions of a thermal power plant affected the physio-chemical status of Peristrophe bicalyculata (Reth) Nees, as observed at the pre-flowering, flowering and post-flowering stages of plant growth. The nitrate level was raised while nitrate reductase activity, and the soluble protein content of leaf declined heavily at the polluted site during different stages of plant growth, compared to the control. The rate of photosynthesis also decreased under the pollution stress. Sugar level in root, stem and leaves increased with growing age of the plant but was always lower at the polluted site than at the reference site. In roots, the difference was marginal till flowering stage and quite conspicuous afterwards; stems showed a reverse pattern of variation. Sulphur content was higher at the polluted site in all the organs and at each stage of the plant life. The Zn and Fe concentrations were reduced in all plant parts under the pollution stress. Copper content in root was consistently low at the polluted site. In the stem and leaves, however, it was almost equal on both the sites at the pre-flowering stage but showed a wide difference during the later part of plant ontogeny.

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Section: Discussionmentioning

confidence: 99%

Coal-smoke pollution modifies physio-chemical characteristics of tissues during the ontogeny of Peristrophe bicalyculata

2008

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“…In Arabidopsis thaliana, the seedlings growth was inhibited in lower concentration of zinc in solution (Li et al, 2005). Also, the treatment with zinc in concentration of 100 -400 μg/g (soil dry mass) determined the significant decrease in root and shoot growth parameters at different stages of development in Artemisia annua plants (Khudsar et al, 2004).…”

Section: The Effect Of Zinc On Seedlings Growthmentioning

confidence: 96%

The Influence Of Zinc On Seed Germination And Growth In The First Ontogenetic Stages In The Species Cucumis Melo L.

Stratu¹,

Costica²

2015

Present Environment and Sustainable Development

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Abstract. The paper presents the results of a study regarding the influence of treatment with zinc in different concentrations (50 mg∕l, 100 mg∕l, 200 mg ∕l, 300mg/l, 400 mg ∕l, 500 mg/l, 600 mg ∕l) on seed germination and growth in early ontogenetic stages of Cucumis melo L. We analyzed the following indicators: the percentage of germinated seeds; the length of root, the length of the hypocotyl and the length of the seedling; the number of the laterale roots; the tolerance index and the seedling vigor index. The results underline the specific variations of analysed indicators, depending on the concentrations used for the treatments of seeds. The concentrations used for treatment do not influence negatively the seed germination, but affected the seedling growth (especially the root elongation), the formation and growth process of lateral roots and the seedling vigour index. The delay effect of growth process is very pronounced in the case of high concentration. IntroductionThe heavy metals come from natural sources and from anthropogenic sources. In certain concentration, the heavy metals become pollutants with toxic potentially; they persist a long time in the environment because of their reduced mobility and can transferred along food chains. Environmental pollution with heavy metals presents a risk for plants, animals and for man. Some heavy metals (zinc, copper, etc) are important for the life of plants; other heavy metals (lead, cadmium, etc) do not have a biological role.

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“…Zn causes the decline in protein content and the corresponding rise in the activity of hydrolytic enzymes such as protease due to heavy metal stress and this observation strongly suggests the catabolic activities. It is likely that heavy metal stress induces senescence through enhancement of catabolism of key metabolites such as chlorophyll, protein and RNA (Khudsar et al 2004).…”

Section: Proteinsmentioning

confidence: 99%

Biochemical changes and adaptive strategies of plants under heavy metal stress

2011

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Heavy metal contamination of soil, aqueous waste stream and ground water causes major environmental and human health problems. Heavy metals are major environmental pollutants when they are present in high concentration in soil and show potential toxic effects on growth and development in plants. Due to unabated, indiscriminate and uncontrolled discharge of hazardous chemicals including heavy metals into the environment, plant continuously have to face various environmental constraints. In plants, seed germination is the first exchange interface with the surrounding medium and has been considered as highly sensitive to environmental changes. One of the crucial events during seed germination entails mobilization of seed reserves which is indispensable for the growth of embryonic axis. But, metabolic alterations by heavy metal exposure are known to depress the mobilization and utilization of reserve food by affecting the activity of hydrolytic enzymes. Some plants possess a range of potential mechanisms that may be involved in the detoxification of heavy metals by which they manage to survive under metal stress. High tolerance to heavy metal toxicity could rely either on reduced uptake or increase planned internal sequestration which is manifested by an interaction between a genotype and its environment. Such mechanism involves the binding of heavy metals to cell wall, immobilization, exclusion of the plasma membrane, efflux of these toxic metal ions, reduction of heavy metal transport, compartmentalization and metal chelation by tonoplast located transporters and expression of more general stress response mechanisms such as stress proteins. It is important to understand the toxicity response of plant to heavy metals so that we can utilize appropriate plant species in the rehabilitation of contaminated areas. Therefore, in the present review attempts have been made to evaluate the effects of increasing level of heavy metal in soils on the key behavior of hydrolytic and nitrogen assimilation enzymes. Additionally, it also provides a broad overview of the strategies adopted by plants against heavy metal stress.

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Zinc-Induced Changes in Morpho-Physiological and Biochemical Parameters in Artemisia annua

Cited by 73 publications

References 31 publications

Coal-smoke pollution modifies physio-chemical characteristics of tissues during the ontogeny of Peristrophe bicalyculata

Coal-smoke pollution modifies physio-chemical characteristics of tissues during the ontogeny of Peristrophe bicalyculata

The Influence Of Zinc On Seed Germination And Growth In The First Ontogenetic Stages In The Species Cucumis Melo L.

Biochemical changes and adaptive strategies of plants under heavy metal stress

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