Soil compaction sensing mechanisms and root responses.

Soil compaction is an agricultural challenge with profound influence on the physical, chemical, and biological properties of the soil. It causes drastic changes by increasing mechanical impedance, reducing water infiltration, gaseous exchange, and biological activities. Soil compaction hinders root growth, limiting nutrient and water foraging abilities of plants. Recent research reveals that plant roots sense soil compaction due to higher ethylene accumulation in and around root tips. Ethylene orchestrates auxin and abscisic acid as downstream signals to regulate root adaptive responses to soil compaction. In this review, we describe the changes inflicted by soil compaction ranging from cell to organ scale and explore the latest research regarding plant root compaction sensing and response.