Influence of some growth regulators and cations on inhibition of chlorophyll biosynthesis by lead in maize

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Bulletin of Environmental Contamination and Toxicology; (United States)

DOI:https://doi.org/10.1007/BF00198887· OSTI ID:6517515

Sinha, S K ^[1]; Srivastava, H S ^[2]; Tripathi, R D ^[3]

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1. Council of Science Technology, Lucknow (India)
2. Rohilkhand Univ., Bareilly (India)
3. National Botanical Research Institute, Lucknow (India)

Phytotoxic effects of Pb pollution are well established. In order to analyse the physiological basis of toxic symptoms and of reduced plant productivity, its effect on chlorophyll content has been examined in some plants. Thus, a decrease in total chlorophyll content during Pb supply has been observed in oats, mung beam, pea, etc. The activity of delta aminolevulinic acid dehydratase, an important enzyme in the biosynthesis of heme pigments, is inhibited by Pb in mung bean and several other species. This observation may perhaps indicate that a reduction in chlorophyll content in the presence of lead is due to an inhibition of pigment synthesis. The effect of Pb on greening maize leaf segments in the presence of various precursors of chlorophyll has been studied in the present investigation to evaluate this hypothesis. The effect of some growth regulators and cations, which could otherwise modify chlorophyll biosynthesis, has been examined to see whether the toxic effects of Pb on photosynthetic pigments could also be modified by these effectors. 16 refs., 4 tabs.

• OSTI ID: 6517515
• Journal Information: Bulletin of Environmental Contamination and Toxicology; (United States), Vol. 51:2; ISSN 0007-4861
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CATIONS
BIOLOGICAL EFFECTS
CHLOROPHYLL
BIOSYNTHESIS
LEAD
MAIZE
PIGMENTS
PLANT GROWTH REGULATORS
CARBOXYLIC ACIDS
CEREALS
CHARGED PARTICLES
ELEMENTS
GRAMINEAE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
IONS
LILIOPSIDA
MAGNOLIOPHYTA
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PLANTS
PORPHYRINS
PROTEINS
SYNTHESIS
560300* - Chemicals Metabolism & Toxicology