Figure 1.

Effects of auxins, glomalin, SLs, and PGs on plant development and health. The presence (W) or absence (WO) of auxins, glomalin, SLs, and PGs can produce positive (green) or negative (red) effects on plants. The presence of a bacterium that secretes auxins helps the plants to stimulate roots, increasing nutrient acquisition from the soil. On the other hand, the absence of glomalin affects soil structure, facilitating soil erosion. Sorghum secretes SLs that induce the germination of the parasite plant Striga lutea, and PGs can disturb the plant cell wall in tomato, affecting plant productivity. [See online article for color version of this figure.]