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Jasmonic acid is required for tomato acclimation to multifactorial stress combination
Lidia S Pascual1, Ron Mittler2, Ranjita Sinha2
1Department of Biology, Biochemistry and Environmental Sciences, University Jaume I, 12071 Valencia, Castellón, Spain.
Environmental and Experimental Botany
|September 6, 2024
Summary
Global warming intensifies environmental stress on crops. Multifactorial stress combinations negatively impact tomato growth and photosynthesis, with jasmonic acid crucial for acclimation.
Area of Science:
- Plant Science
- Environmental Stress Biology
- Agricultural Science
Background:
- Climate change and pollution increase the frequency and intensity of abiotic stressors affecting crop yields globally.
- Multifactorial stress combination (MFSC) describes the complex impact of multiple simultaneous or sequential stressors on plants.
Purpose of the Study:
- To investigate the impact of a multifactorial stress combination (MFSC) of six abiotic stressors on mature tomato plants.
- To explore the relationship between proline accumulation and MFSC.
- To determine the role of hormonal signaling, specifically jasmonic acid, in plant responses to MFSC.
Main Methods:
- Exposure of mature tomato plants to a combination of six abiotic stressors: high light, heat, nitrogen deficiency, paraquat, cadmium, and salinity.
- Assessment of plant growth, photosystem II function, and photosynthetic activity.
- Measurement of proline levels, hormonal profiles, and stomatal responses.
- Utilizing a tomato mutant deficient in jasmonic acid.
Main Results:
- MFSC significantly reduced tomato plant growth, photosystem II function, and photosynthetic activity.
- A negative correlation was observed between proline accumulation and the number of combined stress factors.
- Hormonal levels and stomatal responses were stress-combination dependent.
- A jasmonic acid-deficient mutant showed increased sensitivity to high light combined with salinity and/or paraquat.
Conclusions:
- MFSC exerts broad negative effects on tomato plants, particularly impacting photosynthesis and proline accumulation.
- Proline accumulation may have an adverse effect under MFSC conditions.
- Jasmonic acid plays a vital role in tomato acclimation to MFSCs involving high light, salinity, and paraquat.
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