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Assessment of Heat-tolerance Potential in QTL Introgressed Lines of Hybrid Rice Restorer, KMR-3R through PS-II Efficiency

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Title Assessment of Heat-tolerance Potential in QTL Introgressed Lines of Hybrid Rice Restorer, KMR-3R through PS-II Efficiency
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Creator V. Jaldhani, D. Sanjeeva Rao, P. Beulah, B. Srikanth, P. R. Rao, D. Subrahmanyam, P. Sudhakar, A. Krishna Satya, C. N. Neeraja and P. Senguttuvel
 
Subject Hybrid rice; KMR-3R; High-temperature stress; Chlorophyll fluorescence
 
Description Not Available
Aims: To assess heat-induced PSII damage and efficiency in eight promising backcross
introgression lines (BC2F6) of KMR-3R/N22 possessing qHTSF1.1 and qHTSF4.1.
Study Design: Randomized Complete Block Design (RCBD) with three replications.
Place and Duration of Study: ICAR-Indian Institute of Rice Research, Hyderabad India during
wet/rainy (Kharif) season 2018.
Methodology: Eight ILs (BC2F6) and parents were evaluated for heat tolerance. The hightemperature
stress was imposed by enclosing the crop with a poly cover tent (Polyhouse) just
before the anthesis stage. The fluorescence parameters viz., maximum efficiency of PSII
photochemistry (Fv/Fm), Electron transport rate (ETR), effective PSII quantum yield (ΦPSII),
coefficient of photochemical quenching (qP) and coefficient of non-photochemical quenching (qN)
were measured under ambient and high-temperature stress.Results: The heat-tolerance potential of ILs was assessed in terms of PSII activity. The results
indicated that significant differences were observed between treatments (T), genotypes (G) and the
interaction between T × G. The physiological basis of introgressed QTLs controls the spikelet
fertility by maintaining the productive and adaptive strategies in heat-tolerant QTL introgressed
lines with stable photosynthetic apparatus (PSII) under high-temperature stress.
Conclusion: The Fv/Fm ratio denotes the maximum quantum yield of PSII. The heat-tolerant QTL
introgressed lines exhibited stable photosynthetic apparatus (PSII) and noted better performance
under high-temperature stress. They may be used as donors for fluorescence traits in breeding rice
for high-temperature tolerance.
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Date 2022-04-07T06:09:09Z
2022-04-07T06:09:09Z
2021-11-26
 
Type Research Paper
 
Identifier 22. Jaldhani, V., Rao, D.S., Beulah, P., Srikanth, B., Rao, P.R., Subrahmanyam, D., Sudhakar, P., Satya, A.K., Neeraja, C.N. and Senguttuvel, P., Assessment of Heat-tolerance Potential in QTL Introgressed Lines of Hybrid Rice Restorer, KMR-3R through PS-II Efficiency, International Journal of Environment and Climate Change 11(11): 258-266.
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http://krishi.icar.gov.in/jspui/handle/123456789/71266
 
Language English
 
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Publisher Not Available