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Distribution of Bio-accumulated Cd and Cr in two Vigna species and the Associated Histological Variations
стр.4-12
Ratheesh Chandra, P., Abdussalam A.K., Salim Nabeesa, Puthur Jos T.
In nutrient culture experiments, bioaccumulation and anatomical effects of cadmium (CdCl2 - 20μM) and chromium (K2Cr2O7 - 600 μM) on the structure of root and stem was studied by histochemical and analytical methods in Vigna radiata and Vigna unguiculata. Each metal exerted specific influences on the anatomy of various tissues in root and stem. Histochemical localisation of cadmium and chromium was observed in the stained sections of root and stem. Atomic Absorption Spectrophotometric study revealed maximum accumulation of cadmium and chromium in the root tissue as compared to shoot with significant variation among the species. Abundant occurrences of densely stained deposits of chromium were seen in the root stelar region of V. unguiculata and to a lesser extend in V. radiata. Cadmium accumulation in V. radiata was comparatively more than that of V. unguiculata. The findings also revealed that the accumulation pattern of cadmium and chromium varies between species and hence is species specific.
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The Effects of Salt Stress on Certain Physiological Parameters in Summer Savory (Satureja hortensis L.) Plants
стр.13-21
Najafi F., Khavari-Nejad R.A., Siah Ali M.
Savory plants were treated with different concentrations of NaCl. Plants were grown under controlled environment and harvested after 42 days for measurements of biochemical and physiological parameters. The essential oil of dryed aerial parts of treated plants were isolated and analyzed with GC/MS. The main essential oil compounds were determined as carvacrol (55.37%) and g-terpinene (32.92%) in control plants. In NaCl treated plants, with increasing NaCl, carvacrol content increased and g-terpinene decreased. In all the plants treated with NaCl, growth parameters, pigments contents and photosynthetic rate were decreased, while, proline and soluble sugars contents increased. Our results indicated that with increasing salinity, carvacrol amount increased which can be considered for medical usages.
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Effect of artificial photoperiod on the blood cell indices of the catfish, Clarias batrachus
стр.22-32
Srivastava S, Choudhary Sanjeev K
The present study is aimed to assess the influence of artificial photoperiod on the blood cell indices of an Indian catfish, Clarias batrachus(Linn.). Blood samples taken from adult fishes exposed to artificial photoperiod of 24L:0D and 0L:24D for a short period of 24 hrs, were analyzed for total RBC, total WBC, differential leukocyte count (DLC) and some physiological variables - glucose and chloride. The total RBC and WBC counts were unaffected by both the artificial photoperiod regimes. However, lymphopenia (p<.05) and neutrophilia (p<.05) were observed under 24L:0D photoperiod. Blood chloride levels were significantly higher (p<.05) in 24L:0D whereas blood glucose levels remained unchanged in both the photoperiod treatments. The 0L:24D photoperiod did not produce any significant change in the blood cell indices neither in the physiological variables. The findings indicate that exposure to continuous light for as short a duration as of 24 hrs elicits stress responses in the leukocyte profile of this nocturnal fish and highlights the role of leukocyte profile as potential stress biomarkers in vertebrates.
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