Anatomical and functional responses of Calendula officinalis L. to SO2 stress as observed at different stages of plant development

Wali, Bushra; Iqbal, Muhammad; Mahmooduzzafar,

doi:10.1016/j.flora.2006.08.002

Cited by 33 publications

(24 citation statements)

References 24 publications

(25 reference statements)

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“…Pollutants induce chemical changes in plant tissues, which then affect metabolic and growth processes and/or cause appearance of visible symptoms and damage (Dhir et al 1999;Nighat et al 1999Nighat et al , 2000Wali et al 2007). Several studies have reported degradation of membrane lipids with possible hydrolysis of proteins inducing quantitative changes in amino acid composition and an increase in reducing sugars prior to the appearance of visible symptoms (Malhotra & Sarkar 1979).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

2008

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“…The increase may be due to a greater allocation of photosynthates towards the apical meristem, as was the case with Triumfetta rhomboidea (Iqbal et al 2009). It is also likely that sulfur requirement of plants is better met in the SO 2 -rich environment, given that much of our soil is sulfur deficient (Wali et al 2007). Reduction in growth, on the other hand, manifests mainly with leaf area, as observed in P. cineraria.…”

Section: Morphological Responsesmentioning

confidence: 98%

“…Foliar protein contents may increase under the influence of low SO 2 stress (Wali et al 2007), but a high stress causes inhibitory effects (Wali et al 2007;Ali et al 2008). The reduction in soluble protein content could be attributed to a breakdown of existing proteins and/or a reduced protein synthesis which may cause enrichment of amino acid pools (Williams and Banerjee 1995).…”

Section: Photosynthetic Responsesmentioning

confidence: 99%

“…Inhibitory action of pollutants on photosynthesis and hormone biosynthesis in leaves is believed to reduce availability of carbohydrates and growth hormones to lower parts of a tree, thus inhibiting wood production in trunks (Kozlowski and Constantinidou 1986;Iqbal et al 2000b). Initiation of cambial development may also be delayed under environmental stress (Wali et al 2007). …”

Section: Cambial Growth and Wood Productionmentioning

confidence: 99%

“…The rate of cambial cell division and the length of the active phase of cambium determine the extent of the annual production of secondary vascular tissues (Iqbal 1995). Atmospheric pollutants may influence the phenomena of development (Wali et al 2007) and seasonal activity (Rajput and Rao 2005) of the cambium as well as the formation of secondary vascular tissues (Iqbal et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Behavioral responses of leaves and vascular cambium ofProsopis cineraria(L.) Druce to different regimes of coal-smoke pollution

Iqbal

Mahmooduzzafar

Aref

et al. 2010

Journal of Plant Interactions

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The foliar and cambial responses of Prosopis cineraria to five different coal-smoke regimes in Delhi, India, were studied using the monthly collections of leaves and cambial blocks as well as the data on SO 2 , NO 2 and particulate concentrations from each of the five study sites. Coal-smoke inhibited pigment concentration, NR activity and sugar content and promoted stomatal index and the nitrate and sulfur contents. Stomatal conductance was low, leading to a drop in the net photosynthetic rate. Cambial activity started quite late and the annual increment of wood was reduced despite a prolonged active phase, possibly due to a distinctly retarded rate of cambial cell division. Vessel proportion in the wood increased but the size of vessel elements and fibers decreased. Such studies may help in identifying trees suitable for cultivation in the pollutionaffected areas.

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Mechanism of Sulfur Dioxide Toxicity and Tolerance in Crop Plants

Singh

Gill

et al. 2012

Improving Crop Resistance to Abiotic Stress

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Anatomical and functional responses of Calendula officinalis L. to SO2 stress as observed at different stages of plant development

Cited by 33 publications

References 24 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

Behavioral responses of leaves and vascular cambium ofProsopis cineraria(L.) Druce to different regimes of coal-smoke pollution

Mechanism of Sulfur Dioxide Toxicity and Tolerance in Crop Plants

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