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Effect of PEG mediated water stress on solute accumulation, relative water content, biomass and antioxidant enzymes in rice

DOI: 10.18805/ijare.v0iOF.3759    | Article Id: A-4477 | Page : 398-405
Citation :- Effect of PEG mediated water stress on solute accumulation, relative water content, biomass and antioxidant enzymes in rice .Indian Journal of Agricultural Research.2016.(50):398-405

Ramadevi Kundur*, Papi Reddy .T and Manohar Rao. D

ramadevipatel@gmail.com
Address :

Department of Genetics, Osmania University, Hyderabad,500 007, Telangana, India.

Submitted Date : 24-07-2015
Accepted Date : 1-06-2016

Abstract

In rice, several cultivated and upland varieties need to be assessed and analyzed for drought tolerance traits which could be used in screening and breeding programs for drought tolerance. Hence, the objectives of this study were to investigate the effects of water deficits in two rice cultivars and thereby analyze the role of several physiological traits useful in rice breeding programs for drought tolerance. The rice varieties Tellahamsa (TH) and N22 were screened for tolerance to drought. A comparative study was done subjecting them to PEG mediated water stress. Accumulation of solutes, i.e., proline, total free aminoacids and sugars; biomass production, Relative Water Content (RWC) and the levels of  antioxidant enzymes, viz., Catalase (CAT), Ascorbate Peroxidase (APX), Glutathione Reductase(GR), and Superoxide Dismutase(SOD) were analyzed in response to water stress. Maximum proline accumulation was seen within 24hrs of stress, after 10 days TH decreased its proline to one-third, whereas in N22 doubled. Although amino acids doubled within 24hrs, gradually they depleted in N22. This may be due to conversion of aminoacids into proline which could be the most compatible solute. Sugars increased within 24hrs, but were depleted in 10days in both. In TH, the shoot and root biomass decreased, whereas in N22 there was a significant increase in root biomass. Shoot and root RWC of N22 was higher than TH under stress. GR increased in both TH and N22, APX and SOD increased only in N22. Proline accumulation, increase of root biomass and  antioxidant enzymes such as APX or SOD during water stress are contributing to drought tolerance and could be used in screening for drought tolerance.

Keywords

Antioxidant enzymes Biomass Drought tolerance Relative Water Content (RWC) Solute accumulation Water stress.

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