The SlASR4 Interaction with the Phloem Protein2 (SlPP2) regulating the tolerance to drought in tomato (Solanum lycopersicum).
Sundas F, Muhammad T, Huang G, Li Y
Crop Improvement
Tomatoes are notoriously thirsty plants, and understanding how they can be bred to handle dry spells means homegrown tomatoes — and the ones at farmers markets — could thrive through the kind of summer droughts that have been wiping out backyard harvests.
Researchers found a natural protein in tomatoes that acts like a stress-response coordinator — when water is scarce, it kicks into high gear to protect the plant's leaves, slow water loss, and neutralize the damaging molecules that build up during drought. They confirmed this by engineering tomato plants to have more or less of this protein and watching how each group handled dry conditions. The protein works partly by linking up with another protein involved in moving nutrients around the plant, suggesting the two work as a team to keep the plant stable under stress.
Key Findings
Tomato plants engineered to overproduce SlASR4 showed reduced water loss, higher leaf water content, and better chlorophyll retention compared to normal and gene-knockout plants under drought conditions.
SlASR4 overexpression significantly increased the activity of antioxidant enzymes (SOD, POD, CAT) that neutralize harmful reactive oxygen species produced during drought stress.
SlASR4 physically binds to Phloem Protein 2 (PP2), a protein found in the plant's nutrient transport system, revealing a novel protein partnership that contributes to drought resistance.
chevron_right Technical Summary
Scientists discovered that a tomato protein called SlASR4 boosts drought tolerance by teaming up with another protein in the plant's transport system, helping tomatoes survive water stress with less damage to their cells and leaves.
Abstract Preview
Drought stress is one of the major constraints of global agricultural productivity, adversely affecting plant water balance, membrane integrity, and oxidative stability. Abscisic acid-stress-ripeni...
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The tomato is a plant whose fruit is an edible berry that is eaten as a vegetable. The tomato is a member of the nightshade family that includes tobacco, potato, and chili peppers. It originated from western South America, and may have been domesticated there, in Mexico, or in Central America. Th...