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7. Assessment of heavy metals in the surrounding soils and their bioconcentrations in few plants near Kathajodi river, Odisha, India

Author

Barik, S. R., Mishra, P. J., Nayak, A. K., Rout, S., Barik, S. R., Mishra, P. J., Nayak, A. K., and Rout, S.

Abstract

The present study was carried out mainly concentrate on assessment of heavy metal in the surrounding soils and their bioconcentration in the different plants near Kathajodi River. Soil and plant samples were collected along the Kathajodi river, Odisha, India. It was found that the dominance of heavy metals follows a decreasing order. The metal concentrations measured in soil at all location generally decreased in the order; Fe > Mn > Ni> Pb> Cu> Zn> Cd. Highest heavy metal concentration in river bank soil Cd (0.72±0.05 mgkg-1); Ni (3.85±0.15 mgkg-1); Cu (1.66±0.15 mgkg-1); Zn (1.54±0.16 mgkg-1); Pb (4.11±0.14 mgkg-1); Fe (142.0±1.16 mgkg-1); Mn (37.30±1.16 mgkg-1) at different site . Among all the grass species I. laxum has the higher affinity for the accumulation of Cd (0.85±0.05) followed by Zn, Pb and Cu. This study indicates that bio concentration of heavy metals in the study area show preferential Cd uptake in the plants followed by Zn, Pb and it may lead to accumulates in the exposed plant part posing risk along the food chain. This calls for immediate action to be implemented to carry out necessary environment mitigation measures for the river as it can be attributed the discharge of untreated domestic waste and effluents in the river.

Published
2016

10. Screening and classification of genotypes for seedling-stage chilling stress tolerance in rice and validation of the trait using SSR markers.

Author

Pradhan, S. K., Nayak, D. K., Guru, M., Pandit, E., Das, Sujata, Barik, S. R., Mohanty, S. P., and Anandan, A.

Subjects
GENOTYPES, STRESS tolerance (Psychology), RICE, GENETIC testing, GENETIC markers, BREEDING
Abstract

Low-temperature stress is an important factor affecting the growth and development of rice in temperate and high-elevation areas. In this study, 220 germplasm lines were used for screening of tolerant genotypes, validation of molecular markers and identification of robust markers for seedling-stage chilling stress tolerance to be used in marker-assisted breeding (MAS) programme. The temperature regimes imposed in the growth chamber simulated cold-stress injuries at the seedling stages of the germplasm lines. The genotypes were classified into six classes: those having susceptible genotypes were classified into moderately and highly susceptible types, while tolerant types into moderately tolerant, tolerant, highly tolerant and very highly tolerant classes. Genotypes namely Langma, Umleng-1 and Geetanjali showed survival up to 25 d, which were better than the positive check Kalinga-III surviving up to 20 d under chilling stress. Ten simple sequence repeat (SSR) markers were tested for differentiation of genotypes. Individual use of SSR markers like RM284, RM286, RM85, RM341 and RM5746 can be applied in MAS breeding including combination use of non-pair markers like RM284, RM239 and RM85, which was even better than the combined use of RM284 and RM85. However, combined use of all ten markers can most effectively be employed for cold tolerance through MAS breeding. [ABSTRACT FROM AUTHOR]

Published
2016
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