دراسة اختبار قدرة نبات Potamogeton praelongous على تراكم بعض العناصر الثقيلة و مدى تأثيرها على بعض الصفات الفسلجية و التشريحية

الملخص EN

The degree of contamination by heavy metals (copper, silver) on some plants of genus Potamogeton praelongous pants has been studied.

Plants were exposed to metal treatments of Cu and Ag for three weeks.

Accumulation of Cu and Ag in all parts of the plant increased significantly with an increase in applied metal concentration, it was 54.23 and 67.53 mg/gm fresh weight in Ag and Cu respectively.

Total chlorophyll content and biomass also declined progressively with increasing concentrations of the heavy metal.

The results showed that decreased total chlorophyll with increased Ag and Cu concentration compared with control treatment, the low chlorophyll content was 7.043 mg/ L in Cu, while in Ag was 9.871mg/L in 15 mg/l concentration.

The total protein was 0.85 % in Ag and 8.64 % of 15 mg/l concentration.

Anatomical analyses of Potamogeton praelongous plants revealed several changes in the leaves and stems of plants submitted to contaminated treatments.

Potamogeton.

The leaves of plants exposed to contamination presented modified anatomical characteristics.

Exposure to heavy metals leads to a reduction in the size of blade thickness, number of conducting elements, reduced cell size of the epidermis and aerenchyma tissue.

Stems undergo changes in size, shape and arrangement of cortical parenchyma cells, plants of the treatment with more contamination had widened cell spaces in the cortex of parenchyma cells, reduced in vascular bundles.