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To observe changes in the nu tri tion al sta tus of corollas during de vel op ment and se nes cence, Petunia ·hybrida cv. Mitchell corollas were analyzed for ma cro nu tri ent and mi cro n u tri ent content, dry weight, fresh weight, and ethylene pro duc tion. Carbon con tent de creased at slightly lower rates than dry weight during corolla development between anthesis and se nes cence, while fresh weight and ethylene pro duc tion followed patterns expected of cli mac ter ic fl owers. Nitrogen, phosphorus, and potassium content declined during de vel op ment. Both phosphorus and potassium content gradually de clined through out de vel op ment with overall losses of about 75% and 40%, respectively. Ni tro gen content declined 50% during de vel op ment but losses occurred only during the fi nal stages of senescence. No signifi cant changes were observed in sulfur, calcium, magnesium, and micronutrient content of the corollas dur ing development. Most el e ments were present in much lower con cen tra tions in corollas than in leaves. The con cen tra tions of calcium, mag ne sium, and man ga nese were about 1-, 5-, and 15-fold lower in corollas than in leaves, respectively. Results indicate that remobilization of selected ma cro nu tri ents from corollas occurred before and during se nes cence. Taken together with the pres ence of low con cen tra tions of ma cro nu tri ents, my data support the contention that petunia corollas are nutritionally in ex pen sive and therefore easily dis pos able organs.

Changes in Mineral Nutrient Concentrations in Petunia Corollas during Development and Senescence