Overview of nutrient remobilization and transport during developmental and precocious senescence. Overview of nutrient remobilization and transport during developmental and precocious senescence. Under optimal conditions, plants undergo developmental senescence. Two types of developmental senescence can occur. During sequential senescence, the nutrient salvage program begins with the oldest leaves and follows the age gradient within the plant. By contrast, reproductive senescence occurs at the whole-plant level in monocarpic plants and involves the nearly simultaneous dismantling of all leaves to support grain filling. However, under adverse environmental conditions, including shading, drought, salt, and biotic stress, the senescence program is initiated as part of the acclimation response. The uptake of nutrients from the soil is an energy-expensive process. Therefore, the salvaging of these nutrients during leaf senescence greatly contributes to the nutrient usage efficiency of the plant. During vegetative growth, large portions of photoassimilates and N-containing compounds are temporarily stored in stem tissues. These reserves are remobilized during whole-plant senescence. The formation of reproductive sink tissues greatly stimulates the onset of senescence in many plant species. In particular, carbon, N, and micronutrients are translocated to the developing seeds. Jos H.M. Schippers et al. Plant Physiol. 2015;169:914-930 ©2015 by American Society of Plant Biologists