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Exogenous selenium improves growth, water balance and chlorophyll content in indica and japonica rice exposed to salinity

Mohammad Abu Naim, Md. Abdul Matin, Taufika Islam Anee, Md. Hasanuzzaman, Imtiaz Faruk Chowdhury, Bam H. N. Razafindrabe, Mirza Hasanuzzaman

Abstract


A pot experiment with three boro rice varieties viz. BRRI dhan45; BRRI dhan47 and Nipponbare was conducted to investigate the role of exogenous Selenium (Se) in growth, yield and antioxidant defense systems of rice under different salt stress conditions. The experiment was carried out with seven salt stress treatments viz. control (without salt), S50 (50 mM salt stress), S50+Se (50 mM salt stress+50 µM Se), S100 (100 mM salt stress), S100+Se (100 mM salt stress+50 µM Se), S150 (150 mM salt stress) and S150+Se (150 mM salt stress+50 µM Se). Salt stress significantly reduced the plant height, effective tillers hill−1, leaf relative water content (RWC) and chlorophyll (chl) content of all these varieties. However, exogenous Se application has shown positive effects in reversing these parameters, specially in case of lower level of stress. But this effect tends to decline with increasing concentration of.Considering the response to exogenous application of Se under the stress condition, BRRI dhan47 can be recognized as a naturally salinity tolerant rice variety as it performed better compared to BRRI dhan45 and Nipponbare.

Keywords


abiotic stress, osmotic stress, plant water relation, salt stress, trace elements

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