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IIVR researchers have found that the expression of SlPRP, a gene involved in the formation of proline-rich protein declines when tomato plant is subjected to drought stress in all the plant parts such as leaves, roots and flowers. They further showed that when the expression of this gene decreases, proline levels increase in the plant. Based on these results, scientists concluded that the plant reduces the expression of this gene under drought stress in order to avoid the use of free prolines for synthesis of protein. This way proline can effectively act as osmoprotectant and mitigate the effects of drought on plant survival till de novo synthesis of proline begins.
