Ultrastructural changes in sunflower root cells in relation to boron deficiency and added auxin

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Abstract
The response of sunflower root cells to conditions of B deficiency and to the addition of exogenous auxin were studied on the ultrastructural level. Although gross morphological effects such as inhibition of root elongation and a change in the direction of cell expansion from longitudinal to radial are similar to both auxin-treated and B-deficient seedling roots, ultrastructural changes are different in the 2 treatments. An increase in cell wall thickness and a loss of membrane integrity are seen as early as 6 h in seedlings grown without B. Auxin-treated root cells do not show this response. A role for B may involve maintenance of membrane integrity rather than determining endogenous auxin levels.