Investigations on the Role of Boron in Plants III. Anatomical Observations

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Abstract
Electron microscopic examination of leaf mesophyll cells of boron-deficient sunflower plant reveals that chloroplasts degenerate and cell walls undergo profound structural changes before any visual deficiency symptoms become apparent. Mitochondria, which increase in number as deficiency develops, frequently show myeline figures, while nuclei may develop dense rhombohedral structures.

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