Lead Accumulation and its Effects on Growth and Biochemical Parameters in Tagetes erecta L

Abstract

Tagetes erecta L. was raised in pots containing soil treated with various concentrations of Pb(NO 3 ) 2 (500, 1000, 1500, 2000 and 2500mg/kg). At maturity plants were separated into root, stem, leaves and inflorescence and lead accumulated in each part was quantified. The effects of lead accumulation on growth was analyzed by the measurement of various growth parameters like root and shoot length, fresh and dry weight of root and shoot and total leaf area per plant. Moreover effect of lead accumulation on biochemical parameters was checked by quantitative estimation of various biochemical parameters like chlorophyll, total protein, free amino acids, total sugar, reducing sugar and starch. Results showed that there is no remarkable negative effect of accumulation of lead on the morphological growth of the plant. Biochemical analysis showed that amount of total protein continuously decreased whereas that of free amino acids continuously increased with increasing concentrations of lead. Amount of chlorophyll, total sugar, reducing sugar and starch contents continuously increased till mid-level i.e., Pb 1500 mg/kg and then continuously decreased at higher concentrations. Results of quantitative estimation of Pb in root, stem, leaves and inflorescence showed that roots accumulated highest amount of Pb followed by stem and leaves, whereas inflorescence contained least amount of Pb.

Metabolism biochemical of young plants of Ucuúba (Virola surinamensis) in the presence of cadmium

“…Studies conducted by Andrade Júnior et al (2019) indicated that V. surinamensis presented medium and high tolerance to Cd. Similar results in the reducing sugar concentration have been found in other species (Shah et al 2017).…”

carbon and nitrogen metabolism of young plants of Ucuúba (Virola surinamensis) in the presence of cadmium

“…In addition, the sugar transported to the roots because of starch degradation would be an essential energy substrate for the resumption of respiration, conferring a mechanism of tolerance of the plant against the phytotoxic effect of Cd (Rahoui et al 2015). Similar results in the reducing sugar concentration have been found in other species (Shah et al 2017).…”

Heavy metal induced stress on wheat: phytotoxicity and microbiological management

“…However, it has been reported to be deleteriously impacted by numerous heavy metals. 104 The toxic metals attack different photosynthetic apparatus and cause: (i) the deposition of metals in the plant foliage, 105 (ii) a change in the physiological activity of the chloroplast membrane and distribution of metals in leaf tissues, such as the stomata, mesophyll and bundle sheath, 106 (iii) reduction in the formation of photosynthetic pigments, 107,108 (iv) alteration in the cytosolic enzymes and organics, 109 (v) variation in the supra-molecular level action, especially on photosystem I, photosystem II, membrane acyl liquids and the carrier proteins of the vascular tissues, 110 and (vi) the destruction of enzymes associated with photosynthetic carbon reduction (PCR) and the xanthophyll cycle. 50,110 The decrease in the chlorophyll ratio under metal stress could possibly be due to the destabilization and destruction of peripheral proteins.…”