During that process, nitrogen is withdrawn from existing leaves. This withdrawal causes chlorophyll to disintegrate, and the old leaves turn yellow. However, many plants can alter their physiology in response to changes in ambient light. If you see new green shoots at the plant's base, it will probably bounce back. Sometimes the whole plant will turn yellow before new, healthy shoots appear.
Many plants also have a chlorotic response to sudden changes in soil moisture.
In these cases, the roots have been stressed and may be dead or dying. Often, however, the plant will grow new roots as the plant readjusts. Most native plants will survive normal cycles of drought and heavy rain, but exotic plants may not be as adaptable. . Frequently, chlorosis occurs when the soil becomes deficient in certain essential elements. Without enough nitrogen, these molecules cannot form.