Nutrient Remobilization, Nitrogen Metabolism and Chloroplast Gene Expression in Senescent Leaves
Along plant ontogeny a continuous traffic of nutrients ensures the recovery of most nutrients from old structures to young, developing, structures (Sabater, 1985). Leaves accumulate the major percentage of nutrients thus, the remobilization of components during leaf senescence is essential for nutrient economy in the plant. The remobilization implies the activation of several hydrolytic enzymes (Sabater and Rodriguez, 1978; Thomas and Stoddard, 1980) and other activities, mainly related to amino acid metabolism (Calle et al., 1986; Cuello and Sabater, 1982; Peoples et al., 1980), which form exportable low size nutrient molecules.
KeywordsLeaf Senescence Chloroplast Genome NADH Dehydrogenase Senescent Leaf Barley Leave
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