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Mapping the 'early salinity response' triggered proteome adaptation in contrasting rice genotypes using iTRAQ
Nita Lakra1, Charanpreet Kaur1, Sneh Lata Singla-Pareek2
1Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
Rice (New York, N.Y.)
|February 1, 2019
Summary
Salt-tolerant Pokkali rice seedlings exhibit a proactive stress machinery, with key proteins naturally abundant, contributing to salinity tolerance. This contrasts with salt-sensitive IR64, highlighting early adaptive mechanisms in rice.
Area of Science:
- Plant Biology
- Proteomics
- Stress Physiology
Background:
- Studying early plant responses to salinity stress is crucial for understanding survival mechanisms.
- Rice seedlings face osmotic shock and ion buildup under salinity, necessitating adaptive strategies.
Purpose of the Study:
- To investigate the proteomic differences and early salt shock responses in contrasting rice genotypes.
- To identify key proteins and pathways involved in salinity tolerance.
Main Methods:
- Utilized isobaric Tags for Relative and Absolute Quantitation (iTRAQ) for proteomic analysis.
- Compared salt-sensitive (IR64) and salt-tolerant (Pokkali) rice seedlings under non-stress and early salt shock conditions.
Main Results:
- Pokkali roots accumulated Na+ more than IR64 shoots under salt shock.
- Pokkali shoots showed higher abundance of photosynthesis and stress tolerance proteins compared to IR64.
- Proteins like ribulose bisphosphate carboxylase/oxygenase activase and glutamate dehydrogenase were elevated in Pokkali under stress.
Conclusions:
- Pokkali rice seedlings possess a pre-activated stress machinery with naturally high protein abundance.
- Specific proteomic alterations in Pokkali contribute to its superior salinity tolerance.
- Early perception and response phases are foundational for stress adaptation in rice.