Prado C, Ponce SC, Pagano E, Prado FE, Rosa M. Differential physiological responses of two Salvinia species to hexavalent chromium at a glance. Aquat Toxicol. 2016;175:213–21.
Ashraf A, Bibi I, Niaz NK, Ok YS, Murtaza G, Shahid M, Kunhikrishnan A, Mahmood T. Chromium VI sorption efficiency of acid-activated banana peel over organo-montmorillonite in aqueous solutions. Int J Phytoremediat. 2017;19:605–13.
Desai C, Jain K, Madamwar D. Evaluation of in-vitro Cr VI reduction potential in cytosolic extracts of three indigenous Bacillus sp. isolated from Cr VI polluted industrial landfill. Bioresour Technol. 2008;99:6059–69.
Viti C, Marchi E, Decorosi F, Giovannetti L. Molecular mechanisms of Cr VI resistance in bacteria and fungi. FEMS Microbiol Rev. 2014;38:633–59.
Lilli MA, Moraetis D, Nikolaidis NP, Karatzas GP, Kalogerakis N. Characterization and mobility of geogenic chromium in soils and river bed sediments of Asopos basin. J Hazard Mater. 2015;281:12–9.
Kuenzer C, Knauer K. Remote sensing of rice crop areas. Int J Remote Sens. 2013;34:2101–39.
Zehr JP. Nitrogen fixation by marine cyanobacteria. Trends Microbiol. 2011;19:162–73.
Singh JS, Kumar A, Rai AN, Singh DP. Cyanobacteria, A precious bio-resource in agriculture, ecosystem, and environmental sustainability. Front. Microbiol. 2016;7:529.
Prasanna R, Jaiswal P, Kaushik BD. Cyanobacteria as a potential option for environmental sustainability-promises and challenges. Ind J Microbiol. 2008;48:89–94.
Munagamage T, Rathnayake IVN, Pathiratne A, Megharaj M. Sensitivity of four cyanobacterial isolates from tropical freshwaters to environmentally realistic concentrations of Cr6+, Cd2+ and Zn2+. Bull Environ ContamToxicol. 2016;96:816–21.
Tiwari S, Patel A, Prasad SM. Kinetin alleviates chromium toxicity on growth and PS II photochemistry in Nostoc muscorum by regulating antioxidant system. Ecotoxicol Environ Saf. 2018;161:296–304.
Peng S, Long M, Zheng L, Song L, Li J. Physiological sensitivity of Haematococcus pluvialis Chlorophyta to environmental pollutants, a comparison with Microcystis wesenbergii cyanobacteria and Pseudokirchneriella subcapitata Chlorophyta. J Appl Phycol. 2019;31:365–74.
Banerjee M, Mishra S, Chatterjee J. Scavenging of nickel and chromium toxicity in Aulosira fertilissima by immobilization: Effect on nitrogen assimilating enzymes. Electron. J. Biotechnol. 2004;715:12.
Prasad SM, Singh JB, Rai LC, Kumar HD. Metal-induced inhibition of photosynthetic electron transport chain in the cyanobacterium Nostoc muscorum. FEMS MicrobLett. 1991;82:95–100.
Popovic M, Tenner-Racz K, Pelser C. Persistence of HIV-1 structural proteins and glycoproteins in lymph nodes of patients under highly active antiretroviral therapy. Proc Natl Acad Sci U S A. 2005;102:14807–12.
Parween T, Jan S, Mahmooduzzafar M, Fatma T. Alteration in nitrogen metabolism and plant growth during different developmental stages of green gram Vigna radiataL. In response to chlorpyrifos. Acta Physiol Plant. 2011;33:2321–8.
Sangwan P, Kumar V, Joshi UN. Effect of chromium VI toxicity on enzymes of nitrogen metabolism in cluster bean Cyamopsis tetragonoloba L. enzyme res. 2014. https://doi.org/10.1155/2014/784036.
Bano F, Zutshi S, Fatma T. Chromium VI induced oxidative stress in Hapalosiphon fontinalis. World J MicrobiolBiotechnol. 2012;28:2505–11.
Gupta A, Ballal A. Unraveling the mechanism responsible for the contrasting tolerance of Synechocystis and Synechococcus to Cr VI, enzymatic and non-enzymatic antioxidants. Aquat Toxicol. 2015;164:118–25.
Hunt RW, Chinnasamy S, Das KC. The effect of naphthalene acetic acid on biomass productivity and chlorophyll content of green algae, coccolithophore, diatom, and cyanobacterium cultures. Appl Biochem Biotechnol. 2011;164:1350–65.
Jin X, Zimmermann J, Polle A, Fischer U. Auxin is a long-range signal that acts independently of ethylene signaling on leaf abscission in Populus. Front Plant Sci. 2015;6:634.
Tarakhovskaya ER, Maslov YI, Shishova MF. Phytohormones in algae. Russ J Plant Physiol. 2007;54:163–70.
Lu Y, Xu J. Phytohormones in microalgae: a new opportunity for microalgal biotechnology? Trends in Plant Sci. 2015;20:273–82.
GiridharBabu A, Wu X, Kabra AN, Kim DP. Cultivation of an indigenous Chlorella sorokiniana with phytohormones for biomass and lipid production under N-limitation. Algal Res. 2017;23:178–85.
Liu D, Zou J, Wang M, Jiang W. Hexavalent chromium uptake and its effects on mineral uptake, antioxidant defence system and photosynthesis in Amaranthus viridis L. Bioresour Technol. 2008;99:2628–36.
Jayashree S, Thangaraju N, Gnanadoss JJ. Toxic effects of chromium on the aquatic cyanobacterium Oscillatoriasp and removal of chromium by biosorption. J Exp Sci. 2012;3:28–34.
Gupta S, Sharma S, Singh S. Hexavalent chromium toxicity to cyanobacterium Spirulina platensis. Int Res J Pharm. 2014;12:910–4.
Zou JH, Wang M, Jiang WS, Liu DH. Effects of hexavalent chromium VI on root growth and cell division in root tip cells of Amaranthus viridis L. Pak J Bot. 2006;38:673–81.
Desikachary TV. Cyanophyta. New Delhi: Indian Council of Agricultural Research; 1959.
Atanasova L, Pissarska MG, Popov GS, Georgiev GI. Growth and endogenous cytokinins of juniper shoots as affected by high metal concentrations. Biol Plant. 2004;48:157–9.
Del Pozo JC, Lopez-Matas M, Ramirez-Parra E, Gutierrez C. Hormonal control of the plant cell cycle. Physiol Plant. 2005;123:173–83.
Ha S, Vankova R, Yamaguchi-Shinozaki K, Shinozaki K, Tran LSP. Cytokinins, Metabolism and function in plant adaptation to environmental stresses. Trends Plant Sci. 2012;17:172–9.
Salama ES, Kabra AN, Ji MK, Kim JR, Min B, Jeon BH. Enhancement of microalgae growth and fatty acid content under the influence of phytohormones. Bioresour Technol. 2014;172:97–103.
Renuka N, Guldhe A, Singh P, Ansari FA, Rawat I, Bux F. Evaluating the potential of cytokinins for biomass and lipid enhancement in microalga Acutodesmus obliquus under nitrogen stress. Energy Convers Manag. 2017;140:14–23.
Giriyappanavar BS. Impact of growth promoters on the growth of two cyanobacteria Nostoc entophytum and Hapalosiphon stuhlamanii. Int J Rec Sci Res. 2013;4:1512–5.
Kumar J, Parihar P, Singh R, Singh VP, Prasad SM. UV-B induces biomass production and nonenzymatic antioxidant compounds in three cyanobacteria. J Appl Phycol. 2015;28:131–40.
Vajpayee P, Tripati RD, Rai UN, Ali MB, Singh SN. Chromium accumulation reduces chlorophyll biosynthesis, nitrate reductase activity and protein content in Nymphaea alba L. Chemosphere. 2000;41:1075–82.
Pinto E, Sigaud-Kutner TCS, Leitao MAS, Okamoto OK, Morse D, Colepicolo P. Heavy metal-induced oxidative stress in algae. J Phycol. 2003;39:1008–18.
Jetley UK, Choudhary M, Fatma T. The impact of physical stresses on the growth of cyanobacterium Spirulina platensis-S5. Ind J Environ Health. 2004;46:303–11.
Page LE, Liberton M, Pakrasi HB. Reduction of photoautotrophic productivity in the cyanobacterium Synechocystis sp. strain PCC 6803 by phycobilisome antenna truncation. J Appl Environ Microbiol. 2012;78:6349–51.
Parmar, A., Singh, N.K., Kaushal, A., Sonawala, S., Madamwar, D., Purification, characterization and comparison of phycoerythrins from three different marine cyanobacterial cultures. Bioresour. Technol. 2011;102:1795–1802.
Cortleven A, Schmülling T. Regulation of chloroplast development and function by cytokinin. J Exp Bot. 2015;66:4999–5013.
Chattopadhayay MK, Tiwari BS, Chattopadhyay G, Bose A, Sengupta ND, Ghosh B. Protective role of exogenous polyamines on salinity-stressed rice Oryza sativa plants. Physiol Plant. 2002;116:192–9.
Bajguz A, Piotrowska-Niczyporuk A. Synergistic effect of auxins and brassinosteroids on the growth and regulation of metabolite content in the green alga Chlorella vulgaris (Trebouxiophyceae). Plant Physiol Biochem. 2013;71:290–7.
Mansouri H, Talebizadeh B. Effect of gibberellic acid on the cyanobacterium Nostoc linckia. J Appl Phycol. 2015;28:2187–93.
Flores E, Herrero A. Assimilatory nitrogen metabolism and its regulation. In: Bryant DA, editor. The mmolecular biology of cyanobacteria. Dordrecht: Kluwer Academic Publishers; 1994. p. 487–517.
Rai LC, Tyagi B, Mallick N, Rai PK. Interactive effects of UV-B and copper on photosynthetic activity of the cyanobacterium Anabaena doliolum. Environ Exp Bot. 1995;35:177–85.
Sheeba, Singh, V.P., Srivastava, P.K., Prasad, S.M., 2011.Differential physiological and biochemical responses of two cyanobacteria Nostoc muscorum and Phormidium foveolarum against oxyfluorfenand UV-B radiation. Ecotoxicol. Environ. Saf. 2011;74(7):1981–93.
Devriese M, Tsakaloudi V, Garbayo I, León R, Vílchez C, Vigara J. Effect of heavy metals on nitrate assimilation in the eukaryotic microalga Chlamydomonas reinhardtii. Plant Physiol Biochem. 2001;39:443–8.
Kumar S, Joshi UN. Nitrogen metabolism as affected by hexavalent chromium in sorghum Sorghum bicolor L. Environ Exp Bot. 2008;64:135–44.
Sanz-Luque E, Chamizo-Ampudia A, Llamas A, Galvan A, Fernandez E. Understanding nitrate assimilation and its regulation in microalgae. Front Plant Sci. 2015;6:899.
Dai GZ, Deblois CP, Liu SW, Juneau P, Qiu BS. Differential sensitivity of five cyanobacterial strains to ammonium toxicity and its inhibitory mechanism on the photosynthesis of rice-field cyanobacterium Ge-Xian-MiNostoc. Aquat Toxicol. 2008;89:113–21.
Shashirekha V, Sridharan MR, Swamy M. Biochemical response of cyanobacterial species to trivalent chromium stress. Algal Res. 2015;12:421–30.
Bajguz A. Suppression of Chlorella vulgaris growth by cadmium, lead and copper stress and its restoration by endogenous brassinolide. Arch Environ ContaminToxicol. 2011;60:406–16.
Planchon M, Jittawuttipoka T, Cassier-Chauvat C, Guyot F, Gelabert A, Benedetti MF, Chauvat F, Spalla O. Exopolysaccharides protect Synechocystis against the deleterious effects of titanium dioxide nanoparticles in natural and artificial waters. J Colloid Interface Sci. 2013;405:35–43.
De Philippis R, Micheletti E. Heavy metal removal with exopolysaccharides- producing cyanobacteria. In: Shammas NK, Hung YT, Chen JP, Wang LK, editors. Heavy metals in the environment. Boca Raton: CRC Press; 2009. p. 89–122.
Kiran B, Kaushik A. Chromium binding capacity of Lyngbya putealis exopolysaccharides. Biochem Eng J. 2008;38:47–54.
Mona S, Kaushik A. Chromium and cobalt sequestration using exopolysaccharides produced by freshwater cyanobacterium Nostoc linckia. Ecol Eng. 2015;82:121–5.
Porra RJ, Thompson WA, Kriedemann PE. Determination of accurate extinction coefficients and simultaneous equations for assaying chlorophylls a and b extracted with four different solvents; verification of the concentration of chlorophyll standards by atomic absorption spectroscopy. Biochim Biophys ActaBioenerg. 1989;975:384–94.
Goodwin TW. Carotenoids. In: Paech K, Tracey MVE, editors. Handbook of plant analysis Vol. 3. Berlin: Springer Varlag; 1954. p. 272–311.
Bennett A, Bogorad L. Complementary chromatic adaptation in a filamentous blue-green alga. J Cell Biol. 1973;58:419–35.
Cawse PA. The determination of nitrate in soil solution by ultraviolet spectrophotometry. Analyst. 1967;92:311–5.
Snell, F.D., Snell, C.T., 1949. Colorimetric methods of Analysis.Vol. 3. Van Nostrand, New York, pp. 804–805.
Herrero A, Flores E, Guerrero MG. Regulation of nitrate reductase levels in the cyanobacteria Anacystis nidulans,, Anabaena sp. strain 7119, and Nostoc sp. strain 6719. J Bacteriol. 1981;145:175–80.
Herrero A, Flores E, Guerrero MG. Regulation of the nitrate reductase level in Anacystis nidulans, activity decay under nitrogen stress. Arch Biochem Biophys. 1984;234:454–9.
Herrero A, Guerrero MG. Regulation of nitrite reductase in the cyanobacterium Anacystis nidulans. J Gen Microbiol. 1986;132:2463–8.
Mérida A, Candau P, Florencio FJ. Regulation of glutamine synthetase activity in the unicellular cyanobacterium Synechocystissp. Strain PCC 6803 by the nitrogen source, effect of ammonium. J Bacteriol. 1991;173:4095–100.
Meers JL, Tempest DW, Brown CM. Glutamine amide, 2-oxoglutarate amino transferaseoxido-reductase NADP’, an enzyme involved in the synthesis of glutamate by some bacteria. J Gen Microbiol. 1970;64:187–94.
Navarro F, Cha¨vez S, Candau P, Florencio FJ. Existence of two ferredoxin-glutamate synthases in the cyanobacterium Synechocystis sp. PCC 6803. Isolation and insertional inactivation of gltB and gltS genes Plant Mol. Biol. 1995;27:753–67.
Chávez S, Candau P. An NAD-specific glutamate dehydrogenase from cyanobacteria identification and properties. FEBS Lett. 1991;285:35–8.
Bradford MM. A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein–dye binding. Anal Biochem. 1976;72:248–54.
Sharma M, Kaushik A, Bala SK, Kamra A. Sequestration of chromium by exopolysaccharides of Nostoc and Gleocapsa from dilute aqueous solution. J Hazard Mater. 2008;157:315–8.
Dubois M, Gilles KA, Hamilton JK, Rebers PA, Smith F. Colorimetric method for determination of sugars and related substances. Anal Chem. 1956;28:350–6.