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Boron (B) is a structural component of plant cell wall and B deficiencycauses disruption in development of plants. In this work, influenceof low B supply on plants morphology and anatomy wasstudied in turnip (Brassica rapa L.), red cabbage (B. oleracea L.var. capitata f. rubra), tobacco (Nicotiana rustica L.) and celery(Apium graveolens L.). Visual B deficiency symptoms were observedin all studied species including curling of leaf margins inturnip, reduction of red coloration in red cabbage, shoot stunting intobacco and turning dark purple colors in celery. Microscopic examinationof cross-sections revealed that diameter of tracheary elementsdecreased and the phloem tissue became disorganized. Hypertrophyof leaf parenchyma cells in tobacco and increased thickeningof collenchyma cell walls in the stem of celery were also observed.Anatomical alterations due to B deficiency were more pronouncedlyobserved in the leaf blades followed by the petiole, stemand roots. Our results indicated that remarkable disruptions occurin development of leaf primordia and vascular bundles upon B starvation.

Morphological and anatomical modifications in leaf, stem and roots of four plant species under boron deficiency conditions