Which of the following is a common characteristic of phosphorus deficiency in plants?

Phosphorus deficiency in plants is commonly characterized by a purpling of leaves, particularly in younger leaves and stems. This coloration occurs because phosphorus is critical for various physiological processes in plants, including energy transfer and photosynthesis. When phosphorus is lacking, plants struggle to produce essential proteins and nucleic acids, leading to inadequate growth and the development of anthocyanin pigments, which can give a purplish hue.

In contrast to other symptoms, increased height or changes in root structure do not typically signify phosphorus deficiency. While leaves turning yellow can indicate various nutrient deficiencies, it is more characteristic of nitrogen deficiency. The thickening of roots is also not a recognized symptom of phosphorus deficiency, as it pertains more to root development in response to other stressors or nutrient availability. Understanding these specific characteristics helps in diagnosing nutrient deficiencies and ensuring proper plant nutrition.