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UV-B is required for normal oil gland development in basil
In Ocimum basilicum grown without UV-B, oil glands are incompletely developed, wrinkled and only partially filled. Ioannidis et al. (pp. 453-460) show that under supplementary UV-B, volatile content increases and the glands fill with oil, as in normal development. Some of the oil sacs then break to release volatiles.
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