Effects of sewage sludge amendment on heavy metal accumulation and consequent responses of Beta vulgaris plants

Effect of air pollution on peri-urban agriculture: a case study.

https://opus.lib.uts.edu.au/bitstream/10453/14606/1/2010005127.pdf

Effect of arsenic on photosynthesis, growth and yield of five widely cultivated rice (Oryza sativa L.) varieties in Bangladesh

Ni2+ toxicity was evaluated in Triticum aestivum L. by its effects on root and shoot length, dry matter production and water content. Over a threshold value of 20 mmol m−3 Ni2+ the degree of toxicity increases as a function of the Ni2+ concentration in the medium. Ni2+-treated roots show enhanced lipid peroxidation; the higher Ni2+ treatment (40mmol m−3) also increases leakage of K+. In roots and shoots, Ni2+ enhances both guaiacol and syringaldazine extracellular peroxidase activity. The increase in extracellular peroxidase activity is also associated with an increase in the phenolic contents of roots and shoots. The observed growth inhibition might be partly the result of the effect of Ni2+ on cell turgor and cell-wall extensibility. Intracellular soluble peroxidases are also stimulated by Ni2+; such effects, independently of the substrate, were detected in extracts of Ni2+-treated shoots at a lower Ni2+ concentration than in the roots. Intracellular peroxidases might act as scavengers of peroxide radicals produced as a result of nickel toxicity.

Nickel toxicity and peroxidase activity in seedlings of Triticum aestivum L.

Air pollution tolerance index of plants

Biochemical properties and chloroplast fine-structure of a viridis mutant of Gateway barley are described. The mutant was deficient in chlorophyll and carotenoids when young but developed nearly no...

Plastid structure, chlorophyll concentration, and free amino acid composition of a chlorophyll mutant of barley

Dormancy was encountered in both seeds and seedlings of Viburnum trilobum Marsh. When seeds were exposed to germinative conditions at 20 °C., dormancy was expressed by slow growth of the radicle and hypocotyl in some seeds, and by lack of germination in others. This type of dormancy was found to be associated with the presence of a water-soluble inhibitor, as well as with a need for an appropriate temperature treatment. Epicotyl dormancy, or failure of shoot growth following seedling emergence, was overcome by removal of the cotyledons.

Effects of temperature treatment and of a native inhibitor on seed dormancy and of cotyledon removal on epicotyl growth in viburnum trilobum marsh

Tomato-plant tissues and homogenates were found to metabolize indole. Tryptophan and indoleacetic acid were identified as reaction products, and in some instances serine was required for indole metabolism. The pH optimum for the reaction was about 5.0. Preparations from zinc-deficient tomato plants metabolized indole more efficiently than those from normal plants.

The metabolism of indole by tomato-plant tissues and extracts

When Gateway barley and its mutant were grown at 600 ft-c and 20 °C the soluble leaf proteins separated into 21 discrete bands by acrylamide gel electrophoresis. The most intense broad band of low mobility probably was fraction I protein and was present in 4-, 6-, and 8-day-old seedlings. At 4 days the amount of this protein in the mutant was small but it increased with age. At 8 days no differences were observed in the electrophoretic patterns of the two lines.On treatment of chloroplast lamellae with 0.5% sodium dodecyl sulfate several proteins were separated electrophoretically from Gateway barley at 4, 6, and 8 days. When grown at 600 ft-c and 20 °C, 4-day-old seedlings of the mutant lacked some of the proteins but at 8 days the gel patterns of Gateway and its mutant were similar. When grown at 1400 ft-c and 23 °C the mutant compared to Gateway lacked some proteins even at 8 days.Under 600 ft-c and 20 °C the mutant had about one-third as much chlorophyll as the normal at 8 days and under 1400 ft-c and...

Soluble and lamellar proteins in seedlings of barley and its virescens mutant in relation to chloroplast development

Development of plastids in a virescens mutant of ‘Gateway' barley was studied during greening of dark-grown seedlings and in seedlings grown in continuous light. Etioplasts of the mutant did not have a crystalline prolamellar body: however, prolamellar bodies were present in chloroplasts of the 4-day-old mutant when grown in continuous light. Upon illumination, the vesicles within etioplasts and young plastids of the mutant joined together to form grana lamellae and these were formed before the stroma lamellae. Formation of the lamellar system in the mutant was slow and the granal stacks were oriented irregularly rather than being all in the same direction within the plastid.The microtubules seen in the stroma of chloroplasts resembled cytoplasmic microtubules, but they were smaller in diameter and they were unlike them in their fixation properties and cold sensitivity. In the normal, microtubules were present in etioplasts and during formation of the lamellar system. However, in the mutant, they were obs...

Saul Zalik

Papers

Plastid structure, chlorophyll concentration, and free amino acid composition of a chlorophyll mutant of barley

Effects of temperature treatment and of a native inhibitor on seed dormancy and of cotyledon removal on epicotyl growth in viburnum trilobum marsh

The metabolism of indole by tomato-plant tissues and extracts

Soluble and lamellar proteins in seedlings of barley and its virescens mutant in relation to chloroplast development

Plastid development in a virescens barley mutant and chloroplast microtubules