Aim: There are few studies dealing with the biogeochemical processes occurring in small estuaries receiving high sewage loading in tropical regions. The aim of this investigation was to characterize the biogeochemical behavior of nutrients in superficial waters collected at the Iguaçu estuarine system, during specific conditions (neap tide), located at the inner sector of a heavily eutrophicate...

The study was conducted to appraise the effect of saline stress on growth, gas exchange, chlorophyll fluorescence, mineral nutrients and non-enzymatic antioxidants in 2 mungbean [Vigna radiata (L.) Wilczek] lines (97001 and 97012). Seeds of each line were sown in sand-filled pots. When the plants were 30 day-old, 2 saline regimes [control (non-saline – full strength Hoagland’s nutrient solution...

The effects of Cd stress (200 micromol/L, 8 days) on respiration and photosynthesis of three wheat cultivars were investigated: Chuanyu 12 (CY12), Chuanmai 42 (CM42), and Chuanmai 47 (CM47). Fifteen-day-old seedlings were exposed to 200 micromol/L CdCl2 for 4 days and 8 days, respectively. The results indicated that Cd was accumulated largely in roots, but little in leaves of all three cultivar...

Soybean is a legume crop and it may fix efficiently atmospheric nitrogen (N) if an adequate amount of phosphorus (P) is present in the soil. The main product of nitrogen fixation in soybean root nodules is ureides. A greenhouse experiment was conducted on a low soil P silly clay soilsand mixture to evaluate the effect of P application and water regimes in a factorial combination on ureides cont...

An attempt has been made to assess the response of Phaseolus mungo L. under influence of cadmium chloride (Cd Cl2) with special reference to growth, morphology, yield and biochemical aspects. Surface sterilized seeds of Phaseolus mungo L. cv. T-9 were exposed to various concentrations of Cd Cl2 solution (10(-2) M, 10(-4) M, 10(-5) M, 10(-8) M and control) for 12 hr at room temperature and these...

Changes in growth and ultrastructure of Azolla caroliniana in response to elevated UV-B radiation were investigated. Exposure of plants to UV-B radiation for 1, 8, 16, 24 and 48 h exhibited a significant decrease in biomass and relative growth rate. This decrease resulted in an increase in doubling time over the control. Also, Chl a and b contents were significantly decreased especially after 1...

Vegetation phenology, as used and studied the related studies, refers to the relationship between climate and periodic development of photosynthetic biomass. selected 15 Hornbeam plots (Carpinus betulus) from study area in a mountainous region from 520m to 1310m above sea level. Ground observations of hornbeam tree growth process from January to December 2004 in 15 day intervals were performed ...

Several theories exist about the role of anthocyanins in senescing leaves. To elucidate factors contributing to variation in autumn leaf anthocyanin contents among individual trees, we analysed anthocyanins and other leaf traits in 27 individuals of red maple (Acer rubrum L.) over two growing seasons in the context of timing of leaf senescence. Red maple usually turns bright red in the autumn, ...

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................................................................................................ I ACKNOWLEDGEMENT.................................................................................... III LIST OF PUBLICATIONS..................................................................................V CONTENTS ....................................................................................