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AOBPreview originally published online on September 4, 2002
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Annals of Botany 90: 453-460, 2002
© 2002 Annals of Botany Company

UV-B is Required for Normal Development of Oil Glands in Ocimum basilicum L. (Sweet Basil)

DAPHNE IOANNIDIS1, LYNDA BONNER2 and CHRISTOPHER B. JOHNSON*,1,2

1 Department of Natural Products and Biotechnology, Mediterranean Agronomic Institute of Chania, PO Box 85, Alsyllion Agrokepion, 73100 Chania, Greece and 2 Department of Botany, The University of Reading, Whiteknights PO Box 221, Reading RG6 6AS, UK

* For correspondence. Department of Natural Products and Biotechnology, Mediterranean Agronomic Institute of Chania, PO Box 85, Alsyllion Agrokepion, 73100 Chania, Greece. E-mail cjohnson{at}maich.gr

Received: 22 March 2002; Returned for revision: 27 May 2002; Accepted: 19 June 2002    Published electronically: 4 September 2002

Plants of Ocimum basilicum L. grown under glass were exposed to short treatments with supplementary UV-B. The effect of UV-B on volatile essential oil content was analysed and compared with morphological effects on the peltate and capitate glandular trichomes. In the absence of UV-B, both peltate and capitate glands were incompletely developed in both mature and developing leaves, the oil sacs being wrinkled and only partially filled. UV-B was found to have two main effects on the glandular trichomes. During the first 4 d of treatment, both peltate and capitate glands filled and their morphology reflected their ‘normal’ mature development as reported in the literature. During the following days there was a large increase in the number of broken oil sacs among the peltate glands as the mature glands broke open, releasing volatiles. Neither the number of glands nor the qualitative or quantitative composition of the volatiles was affected by UV-B. There seems to be a requirement for UV-B for the filling of the glandular trichomes of basil.

Key words: Ocimum basilicum L., sweet basil, glandular trichomes, UV-B, morphology, terpenes, essential oil.


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