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

V. Jaldhani; D. Sanjeeva Rao; P. Beulah; B. Srikanth; P. R. Rao; D. Subrahmanyam; P. Sudhakar; A. Krishna Satya; C. N. Neeraja; P. Senguttuvel

doi:10.9734/ijecc/2021/v11i1130540

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

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Published: 2021-11-26

DOI: 10.9734/ijecc/2021/v11i1130540

Page: 258-266

Issue: 2021 - Volume 11 [Issue 11]

V. Jaldhani

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

D. Sanjeeva Rao

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

P. Beulah

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

B. Srikanth

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

P. R. Rao

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

D. Subrahmanyam

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

P. Sudhakar

Biotechnology Department, Acharya Nagarjuna University, Guntur, India.

A. Krishna Satya

Biotechnology Department, Acharya Nagarjuna University, Guntur, India.

C. N. Neeraja

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

P. Senguttuvel *

ICAR - Indian Institute of Rice Research, Rajendranagar, Hyderabad, India.

*Author to whom correspondence should be addressed.

Abstract

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 high- temperature 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.

Keywords: Hybrid rice, KMR-3R, High-temperature stress, Chlorophyll fluorescence

How to Cite

Jaldhani, V., D. Sanjeeva Rao, P. Beulah, B. Srikanth, P. R. Rao, D. Subrahmanyam, P. Sudhakar, A. Krishna Satya, C. N. Neeraja, and P. Senguttuvel. 2021. “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):258-66. https://doi.org/10.9734/ijecc/2021/v11i1130540.