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A series of experiments was con duct ed to investigate the response to drought stress of marigold (Tagetes patula L. 'Janie Tangerineʼ) plants grown with reduced phos pho rus. Plants were grown with con ven tion al phosphorus fertilization (1 mM, con trol) or one of two levels of alumina-buffered phos pho rus (Al-P), 21 or 5 µM. Plants supplied with 21 µM Al-P pro duced plants with equal total dry weight, more fl owers and reduced leaf area com pared to control plants. Whole-plant pho to syn thet ic CO 2 as sim i- la tion ex pressed on a leaf area basis was nearly twice as high in 21 µM Al-P plants as in controls, probably as a result of reduced intraplant shad ing. In plants supplied with 21 µM Al-P, smaller leaf area resulted in reduced whole-plant transpiration. Moreover, the relative water content of the growing medium was sig nifi cant ly lower at wilting with 21 µM Al-P than for control or 5 µM Al-P regimes. The im proved water acquisition with 21 µM Al-P could be explained by increased root pro lif er a tion via longer main roots and less densely distributed lateral roots. The re sults indicate that optimizing phosphorus nu tri tion with sol id-phase buffered-phos pho rus fertilizer improves drought tol er ance by reducing tran spi ra tion and in creas ing wa ter ac qui si tion from the medium.

Improved Drought Tolerance in Marigold by Manipulation of Root Growth with Buffered-phosphorus Nutrition