Raya (Brassica juncea) and spinach (Spinacia oleracea), grown as leafy vegetables, are known to accumulate large amounts of heavy metals in their shoots and roots because of their high biomass and root proliferation. In a pot experiment, a sandy loam soil was polluted with cadmium (Cd) at rates of 0, 5, 10, 20, 40 and 80 mg kg−1 soil to assess the accumulation pattern and its effect on the dry matter yield and mineral composition of these vegetables. There was a decrease in dry matter yield due to the phytotoxic effect of Cd. The rate of Cd application at which a significant decline in root and shoot dry matter yield occurred varied depending on the vegetable. It was 20 mg Cd kg−1 soil in the shoots for both crops. However, the roots of raya were found to be more tolerant of Cd toxicity than those of spinach, as is evident from the fact that a significant decline in dry matter yield occurred at 20 and 10 mg Cd kg−1 soil, respectively. Since no visual toxic symptoms were observed on the leaves of raya in any of the treatments, it is clear that the metal may accumulate in this vegetable without visual evidence of its presence. However, at application levels beyond 40 mg kg−1 soil, toxicity symptoms, in the form of interveinal chlorosis of the leaf lamina followed by necrosis and leaf rolling, were clearly evident in the case of spinach. The reduction in root and shoot growth corresponded with the amounts of extractable Cd in the soils. The total content of Cd in the crops increased gradually as the rate of applied Cd rose and the roots accumulated much higher amounts than the shoots. The relationship of Cd with Zn and Fe was synergistic in both roots and shoots at the lower rates, but antagonistic at higher Cd application rates for both the crops, while in the case of Mn and Cu, the relationship was negative and antagonistic.
Adhikari, T., Tel-Or, E., Libal, Y., Shenker, M. (2006): Effect of cadmium and iron on rice (Oryza sativa L.) plant in chelator-buffered nutrient solution. J. Plant Nutr., 29, 1919–1940.
Shenker M. , 'Effect of cadmium and iron on rice (Oryza sativa L.) plant in chelator-buffered nutrient solution ' (2006 ) 29 J. Plant Nutr. : 1919 -1940 .
Baryla, A., Carrier, P., Franck, F., Coulomb, C., Sahut, C., Havaux, M. (2001): Leaf chlorosis in oilseed rape plants (Brassica napus) grown on cadmium-polluted soil: causes and consequences for photosynthesis and growth. Planta, 212, 696–709.
Havaux M. , 'Leaf chlorosis in oilseed rape plants (Brassica napus) grown on cadmium-polluted soil: causes and consequences for photosynthesis and growth ' (2001 ) 212 Planta : 696 -709 .
Benavides, M. P., Gallego, S. M., Tomaro, M. L. (2005): Cadmium toxicity in plants. Brazilian J. Plant Physiol., 17, 49–55.
Tomaro M. L. , 'Cadmium toxicity in plants ' (2005 ) 17 Brazilian J. Plant Physiol. : 49 -55 .
Bipasha, C., Srivastava, S., Chakravarty, V., Srivastava, B. (1997): Effect of cadmium and zinc interaction on metal uptake and regeneration of tolerant plants in linseed. Agr. Ecol. Environ., 61, 45–50.
Srivastava B. , 'Effect of cadmium and zinc interaction on metal uptake and regeneration of tolerant plants in linseed ' (1997 ) 61 Agr. Ecol. Environ. : 45 -50 .
Brar, M. S., Khurana, M. P. S., Kansal, B. D. (2002): Effect of irrigation by untreated sewage effluents on the micro and potentially toxic elements in soils and plants. Proc 17th World Congress Soil Science, Bangkok, Thailand, Vol. IV, Paper No. 198.
Cataldo, D. A., Garland, T. R., Wildung, R. E. (1983): Influence of soil applied Cd on growth and nutrient composition of plant species. Plant Physiol., 73, 844–848.
Wildung R. E. , 'Influence of soil applied Cd on growth and nutrient composition of plant species ' (1983 ) 73 Plant Physiol. : 844 -848 .
Cieslinski, G., Neilson, G. H., Hogue, E. J. (1996): Effect of soil cadmium application and pH on growth and cadmium accumulation in root, leaves and fruit of strawberry plants. Plant Soil, 180, 267–276.
Hogue E. J. , 'Effect of soil cadmium application and pH on growth and cadmium accumulation in root, leaves and fruit of strawberry plants ' (1996 ) 180 Plant Soil : 267 -276 .
Dahiya, S. S., Goel, S., Antil, R. S., Singh, A. (1991): Effect of Cd and N on dry matter yield and uptake of nutrients in corn. Ann. Biol., 7, 205–208.
Singh A. , 'Effect of Cd and N on dry matter yield and uptake of nutrients in corn ' (1991 ) 7 Ann. Biol. : 205 -208 .
Ebbs, S. D. Kochian, L. V. (1998): Phytoextraction of zinc by oat (Avena sativa), barley (Hordeum vulgare) and Indian mustard (Brassica juncea). Environ. Sci. Technol., 32, 802–806.
Kochian L. V. , 'Phytoextraction of zinc by oat (Avena sativa), barley (Hordeum vulgare) and Indian mustard (Brassica juncea) ' (1998 ) 32 Environ. Sci. Technol. : 802 -806 .
Ebbs, S. D., Kochian, L. V. (1997): Toxicity of zinc and copper to Brassica species. Implications for phytoremediation. J. Environ. Qual., 26, 776–781.
Kochian L. V. , 'Toxicity of zinc and copper to Brassica species ' (1997 ) 26 Implications for phytoremediation. J. Environ. Qual. : 776 -781 .
Gupta, V. K., Dixit, M. L. (1992): Influence of soil applied cadmium on growth and nutrient composition of plant species. J. Indian Soc. Soil Sci., 40, 878–880.
Dixit M. L. , 'Influence of soil applied cadmium on growth and nutrient composition of plant species ' (1992 ) 40 J. Indian Soc. Soil Sci. : 878 -880 .
Kabata, P. A., Pendias, H. (1984): Trace Elements in Soil and Plants. CRC Press Inc., Boca Raton, Florida, U.S.A.
Pendias H. , '', in Trace Elements in Soil and Plants , (1984 ) -.
Khan, S., Khan, N. N. (1983): Influence of lead and cadmium on the growth and nutrient concentration of tomato (Lycopersicon esculentum) and egg plant (Solanum melongena). Plant Soil, 74, 387–394.
Khan N. N. , 'Influence of lead and cadmium on the growth and nutrient concentration of tomato (Lycopersicon esculentum) and egg plant (Solanum melongena) ' (1983 ) 74 Plant Soil : 387 -394 .
Khurana, M. P. S. (2000): Transformations and bio-availability of cadmium in alluvial soils as influenced by cadmium, manure and zinc application. PhD Dissertation. Punjab Agricultural University, Ludhiana, India.
Khurana M. P. S. , '', in Transformations and bio-availability of cadmium in alluvial soils as influenced by cadmium, manure and zinc application , (2000 ) -.
Khurana, M. P. S., Nayyar, V. K., Bansal, R. L. (2003): Crop plants for phytoremediation of agricultural lands contaminated with heavy metals. Proc. National Conference on Soil-Elixir of Life. Patiala, Punjab, India. p. 38.
Koshino, M. (1973): Cadmium uptake by rice and wheat as affected by the application of phosphate and some metal elements. Bulletin Nation. Inst. Agr. Sci., Tokyo, Japan, pp. 241–251.
Kuboi, T., Noguchi, A., Yazaki, J. (1986): Family dependent cadmium accumulation characteristics in higher plants. Plant Soil, 92, 405–415.
Yazaki J. , 'Family dependent cadmium accumulation characteristics in higher plants ' (1986 ) 92 Plant Soil : 405 -415 .
Kumar, N. P. B. A., Dushenkov, V., Motto, H., Raskin, I. (1995): Phytoextraction: The use of plants to remove heavy metals from soils. Environ. Sci. Technol., 29, 1232–1238.
Raskin I. , 'Phytoextraction: The use of plants to remove heavy metals from soils ' (1995 ) 29 Environ. Sci. Technol. : 1232 -1238 .
Lindsay, W. L., Norvell, A. W. (1978): Development of a DTPA soil test for zinc, iron, manganese, and copper. Soil Sci. Soc. Amer. J., 42, 421–428.
Norvell A. W. , 'Development of a DTPA soil test for zinc, iron, manganese, and copper ' (1978 ) 42 Soil Sci. Soc. Amer. J. : 421 -428 .
Maclean, A. J. (1976): Cadmium in different plant species and its availablility in soils as influenced by organic matter and addition of lime, phosphorus, cadmium and zinc. Can. J. Soil Sci., 56, 129–138.
Maclean A. J. , 'Cadmium in different plant species and its availablility in soils as influenced by organic matter and addition of lime, phosphorus, cadmium and zinc ' (1976 ) 56 Can. J. Soil Sci. : 129 -138 .
Mahler, R. J., Bingham, F. T., Page, A. L., Ryan, J. A. (1982): Cadmium enriched sewage sludge application to acid calcareous soils. Effect on soil and nutrition of lettuce, corn, tomato and Swiss chard. J. Environ. Qual., 11, 694–700.
Ryan J. A. , 'Cadmium enriched sewage sludge application to acid calcareous soils ' (1982 ) 11 Effect on soil and nutrition of lettuce, corn, tomato and Swiss chard. J. Environ. Qual. : 694 -700 .
Mengel, K., Kirkby, E. A., Kosegarten, H., Appel, T. (2001): Principles of Plant Nutrition, 5th edition. Springer, Heidelberg.
Appel T. , '', in Principles of Plant Nutrition , (2001 ) -.
Metwally, A., Safronova, V. I., Bellimov, A. A., Dietz, K. J. (2005): Genotypic variation of the response to cadmium toxicity in Pisum sativum L. J. Exp. Bot., 56, 167–178.
Dietz K. J. , 'Genotypic variation of the response to cadmium toxicity in Pisum sativum L ' (2005 ) 56 J. Exp. Bot. : 167 -178 .
Narwal, R. P., Singh, M., Dahiya, D. J. (1990): Effect of cadmium on growth and heavy metal content of corn (Zea mays L.). Crop Res., 3, 13–20.
Dahiya D. J. , 'Effect of cadmium on growth and heavy metal content of corn (Zea mays L ' (1990 ) 3 Crop Res. : 13 -20 .
Narwal, R. P., Singh, M., Singh, J. P., Dahiya, D. J. (1993): Cadmium-zinc interaction in maize grown on sewer water irrigated soil. Arid Soil Res. Rehab., 7, 125–135.
Dahiya D. J. , 'Cadmium-zinc interaction in maize grown on sewer water irrigated soil ' (1993 ) 7 Arid Soil Res. Rehab. : 125 -135 .
Page, A. L. (ed.) (1982): Methods of Soil Analysis Part 2. Chemical and Mineralogical Properties. 2nd ed., Am. Soc. Agron., Madison, WI, USA.
'', in Methods of Soil Analysis Part 2. Chemical and Mineralogical Properties , (1982 ) -.
Panse, V. G., Sukhatme, P. V. (1967): Statistical Methods for Agricultural Workers. ICAR, New Delhi.
Sukhatme P. V. , '', in Statistical Methods for Agricultural Workers , (1967 ) -.
Patel, P. M., Wallace, A., Mueller, R. T. (1976): Some effects of Cu, Co, Cd, Zn, Ni and Cr on growth and mineral element concentration in Chrysanthemum. J. Am. Soc. Hort. Sci., 101, 553–556.
Mueller R. T. , 'Some effects of Cu, Co, Cd, Zn, Ni and Cr on growth and mineral element concentration in Chrysanthemum ' (1976 ) 101 J. Am. Soc. Hort. Sci. : 553 -556 .
Piper, C. S. (1960): Soil and Plant Analysis. Hans Publishers, Bombay.
Piper C. S. , '', in Soil and Plant Analysis , (1960 ) -.
Root, R. A., Miller, R. J., Koeppe, D. E. (1975): Uptake of cadmium — its toxicity and effect on the iron ratio in hydroponically grown corn. J. Environ. Qual., 4, 473–476.
Koeppe D. E. , 'Uptake of cadmium — its toxicity and effect on the iron ratio in hydroponically grown corn ' (1975 ) 4 J. Environ. Qual. : 473 -476 .
Rupp, D., Ruhl, E., Alleweldt, G. (1985): Cadmium toxicity in grape vines. Vitis, 24, 88–96.
Alleweldt G. , 'Cadmium toxicity in grape vines ' (1985 ) 24 Vitis : 88 -96 .
Sanita di Toppi. L., Gabbrielli, R. (1999): Response to cadmium in higher plants. Environ. Exp. Bot., 41, 105–130.
Gabbrielli R. , 'Response to cadmium in higher plants ' (1999 ) 41 Environ. Exp. Bot. : 105 -130 .
Singh, S. P., Nayyar, V. K. (1989): Accumulation characteristics of cadmium and its upper critical levels in selected vegetable species. Int. J. Environ. Studies, 36, 199–204.
Nayyar V. K. , 'Accumulation characteristics of cadmium and its upper critical levels in selected vegetable species ' (1989 ) 36 Int. J. Environ. Studies : 199 -204 .
Singh, S. P., Nayyar, V. K. (1991): Effect of cadmium on growth and cadmium and zinc content of wheat on a typic ustipsamments. J. Indian Soc. Soil Sci., 39, 204–205.
Nayyar V. K. , 'Effect of cadmium on growth and cadmium and zinc content of wheat on a typic ustipsamments ' (1991 ) 39 J. Indian Soc. Soil Sci. : 204 -205 .
Singh, S. P., Nayyar, V. K. (1994): Accumulation characteristics of cadmium in selected forage species. J. Indian Soc. Soil Sci., 42, 96–100.
Nayyar V. K. , 'Accumulation characteristics of cadmium in selected forage species ' (1994 ) 42 J. Indian Soc. Soil Sci. : 96 -100 .
Singh, S. P., Takkar, P. N., Nayyar, V. K. (1989): Effect of cadmium on wheat as influenced by lime and manure and its toxic level in plant and soil. Int. J. Environ. Studies, 33, 59–66.
Nayyar V. K. , 'Effect of cadmium on wheat as influenced by lime and manure and its toxic level in plant and soil ' (1989 ) 33 Int. J. Environ. Studies : 59 -66 .
Smeets, K., Cypers, A., Lamrechts, A., Semane, B., Hoet, P., Laere, A. V., Vangronsveld, J. (2005): Induction of oxidative stress and antioxidative mechanisms in Phaseolus vulgaris after Cd application. Plant Physiol. Biochem., 43, 437–444.
Vangronsveld J. , 'Induction of oxidative stress and antioxidative mechanisms in Phaseolus vulgaris after Cd application ' (2005 ) 43 Plant Physiol. Biochem. : 437 -444 .
Tandon, H. L. S. (2003): Methods of Analysis of Soils, Plants, Waters and Fertilizers. pp. 49–82. Fertilizer Development and Consultation Organization. New Delhi, India
Tandon H. L. S. , '', in Methods of Analysis of Soils, Plants, Waters and Fertilizers , (2003 ) -.
Wang, M. E., Zhou, Q. X. (2006): Joint stress of chlorimuron-ethyl and cadmium on wheat Triticum aestivum at biochemical levels. Environ. Pollut., 144, 572–580.
Zhou Q. X. , 'Joint stress of chlorimuron-ethyl and cadmium on wheat Triticum aestivum at biochemical levels ' (2006 ) 144 Environ. Pollut. : 572 -580 .
Wu, F., Dong, J., Jia, G., Zheng, S., Zhang, G. (2006): Genotypic difference in the responses of seedling growth and Cd toxicity in rice (Oryza sativa L.). Agr. Sci. China, 5, 68–76.
Zhang G. , 'Genotypic difference in the responses of seedling growth and Cd toxicity in rice (Oryza sativa L.) ' (2006 ) 5 Agr. Sci. China : 68 -76 .
Wu, F., Wu, H., Zhang, G., Bachir, D. M. L. (2004): Differences in growth and yield in response to cadmium toxicity in cotton genotypes. J. Plant Nutr. Soil Sci., 167, 85–90.
Bachir D. M. L. , 'Differences in growth and yield in response to cadmium toxicity in cotton genotypes ' (2004 ) 167 J. Plant Nutr. Soil Sci. : 85 -90 .
Zhang, G., Fukami, M., Sekimoto, H. (2002): Influence of cadmium on mineral concentrations and yield components in wheat genotypes differing in Cd tolerance at seedling stage. Field Crop Res., 77, 93–98.
Sekimoto H. , 'Influence of cadmium on mineral concentrations and yield components in wheat genotypes differing in Cd tolerance at seedling stage ' (2002 ) 77 Field Crop Res. : 93 -98 .