Occurrence, Severity and Nature of Oedema in Pelargonium hortorum Ait.12

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<jats:title>Abstract</jats:title> <jats:p>Five cultivars of <jats:italic>Pelargonium hortorum</jats:italic> Ait. were used to determine the effect of soil and air temperatures, photoperiod, light intensity, soil water content, and cultivar response on the occurrence and severity of oedema. Oedema was most severe on the peripheral portions of the lower epidermis of the lower, older leaves of the plants. As the disorder progressed, the symptoms became prevalent over the entire lower epidermis. Symptom expression was similar in appearance on most of the cultivars, but the cultivars differed in their susceptibility. A continuously warm moist soil with humid cool night temperatures predisposed plants to oedema. Anatomically, hypertrophy of the spongy parenchyma cells into the sub-stomatal cavity resulted in the occlusion of the stomatal pore. In severe stages the spongy parenchyma cells divided periclinally and a periderm was differentiated which resulted in the raised macroscopic intumescences characteristic of oedema.</jats:p>

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