Effect of road traffic pollutants on vitis vinifera, L and citrus sinensis osbeck

This study investigates the accumulation of some heavy metals of road traffic along Alex.-Cairo highway in roots and leaves of fruit trees, Vitis vinifera and PARTIAL Citrus sinensis, and the soil underneath, and the effect of these pollutants on carbohydrate and chlorophyll contents. The results of this study revealed that the amount of dead fine roots [in terms of dry weight] was higher in the two species as they get nearer to the road. The average live/dead root ratio at 120m away from the road was 6.72 compared with 1.36 close to the road. The concentrations of Zn, Pb and Cd in the roots and leaves of grape and orange and in the soils underneath were of highest values close to the road. The same was noticed for chlorophyll, but carbohydrate content was not affected

Effect of iron chlorosis on some metabolic components in apple trees at Nobaria, Egypt

The study revealed that leaf Fe-chlorosis seems to cause a disturbance in nitrogen and carbohydrate metabolism in apple trees [Malus domestica, Borkh.] variety Delicious. Total and soluble nitrogen and total free amino acids increased significantly in chlorotic leaves, while insoluble nitrogen and protein were markedly decreased. Proline was not alterd between healthy and chlorotic leaves in both seasons. In comparison with chlorotic leaves, healthy ones had significantly higher levels of soluble sugars, polysaccharides and total available carbohydrates and consequently the C/P ratio was higher in healthy than in chlorotic leaves

study of iron chlorosis in piscium guajava L-leaves

Chlorotic leaves of guava trees [Psidium gaujava L] had significantly higher levels of P, K, Na, Mg, Zn, Mn and total iron as compared with healthy green leaves. Significantly higher contents of N and Ca as well as"active" iron and ferrous were recorded in healthy green leaves. The "active" iron fraction of the leaves as extracted by etherized hydrochloric acid showed no relationship with the total iron but a very significant linear relationship was found between the "active" iron fraction and the ratio of total phosphorus to total iron. Significantly higher ratios of K/Ca, P/Fe and Mn/Fe were found in chlorotic leaves than in green ones. The activities of catalase and peroxidase enzymes were higher in green leaves than in chlorotic ones, but catalase activity was more related with leaf iron chlorosis than peroxidase

Effect of dust contamination on soil, leaf chemical composition and fruit quality of piscium guava L.

The aim of the present study is to evaluate the effect of dust contamination at different distances on soil, leaf chemical composition, fruit set and fruit quality of Psidium guajava L. The study revealed that, Ni. Pb and Cd contents in soil decreased with increasing distance from the source of dust and with increasing soil depth. In leaves. P, Na, K, Ca and Mg exhibited an appreciable increase in their contents in trees adjacent to the road. Chlorophyll contents showed a slight increase and the variation in total available carbohydrates was insignificant as compared with trees distant from the road. In the two studied seasons [1990 and 1991], the average fruit set, mature fruits and fruit weight was signifcantly lower in trees adjacent the road. The reverse was true for core/flesh ratio. The contents of citric acid and vitamin C were significantly higher in fruits adjacent and distant from the road respectively. Concerning the heavy metals content in leaves and fruit parts [flesh and core], the results indicated that Mn, Ni, Pb and Cd in leaves and Ni, Pb and Cd in fruit parts significantly higher in trees adjacent the road

Mineral composition in the ecosystems of fruit trees in Egypt 3-olea europaea L.

Orchards varied much greatly in their nutrient concentrations. Application of step-wise multiple regression model revealed that, electric conductivity, soil texture, pH, CaCO[3]concentration and organic matter [O.M] were the most important edaphic factors affecting nutrient concentration levels in leaves of O. europaea. The yield [Kg/tree] was strongly affected besides these factors by tree age. Application of PCA proved that, the distribution of orchards in the three dimensional plane varies along two gradients, [a] nutrient gradients in leaves and roots and [b] edaphic gradients of soil salinity, CaCo[3], pH and organic utter [O.M]