Indexing

Performance of ETR and Y(II) of two Contrasting Rice (Oryza sativa L.) Genotypes under Water Stress

Author: Selukash Parida, Goutam Kumar Dash, Kailash Chandra Samal and Padmini Swain*

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Abstract

Two rice (Oryza sativa L.) genotypes Parijata and Prasad were imposed to water stress (WS) to evaluate the performance of electron transport rate (ETR) and effective PSII quantum yield (Y (II) ). The experiment was performed in pots. The WS was imposed before 10 days of flowering by withdrawing irrigation and maintaining the pots at 50% field capacity. Under WS at flowering stage, the value of ETR,Y(II), Maximum quantum yield of PSII photochemistry (Fv/Fm), membrane stability index (MSI), relative water content (RWC), malondialdehyde (MDA) and total chlorophyll content were decreased in both the genotypes. However, the reduction was more prominent in Prasad. Reduction in Fv/Fm, ETR and Y (II) indicated balanced energy management in tolerant genotype Parijata. With higher ETR and Y (II) the tolerant genotype is associated with improving photosynthetic rate (Pn). The studies showed that the genotype Parijata is tolerant and Prasad is susceptible to WS in nature. The experiment signifies

Keywords

Electron transport rate, quantum yield, water stress, Fv/Fm, MDA.

Conclusion

An attempt has been inclined to the recognition of suitable traits that can accurately distinguish between tolerant and susceptible genotypes under WS. The genotypes Parijata showed more tolerance to WS. Targeting ETR and Y (II) at different light intensities was found to provide significant phenotypic information and sensitivity levels of genotypes under WS. With higher ETR and Y (II) the tolerant genotype is associated with improving photosynthetic rate (Pn). Strong correlations between Fv/Fm, MSI, RWC, MDA and total chlorophyll suggested that these parameters should be studied in the association while evaluating WS tolerance.

References

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How to cite this article

Parida, S., Dash, G. K., Samal, K.C. and Swain, P. (2021). Performance of ETR and Y(II) of Two Contrasting Rice (Oryza sativa L.) Genotypes under Water Stress. Biological Forum – An International Journal, 13(3a): 824-829.