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Effect of m-tyrosine on lettuce. (A) Comparison of the effect of F. rubra cv. Intrigue aqueous root exudate extract and authentic m-tyrosine on lettuce (L. sativa) seedling root growth (9). (Inset) Photograph of 3-day-old lettuce seedlings exposed to various concentrations of aqueous root exudate extract, showing stunted growth and discoloration of root tips. (B) Effect of o-, m-, and p-tyrosine on lettuce seedling radicle elongation (9).
