A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants. It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which are otherwise impermeable to gases. The name lenticel, pronounced with an [s], derives from its lenticular (lens-like) shape. The shape of lenticels is one of the characters used for tree identification.
Lenticel formation usually begins beneath stomatal complexes during primary growth preceding the development of the first periderm. Lenticels are found as raised circular, oval, or elongated areas on stems and roots. As stems and roots mature lenticel development continues in the new periderm (for example, periderm that forms at the bottom of cracks in the bark). Lenticels are also found in pneumatophorous roots (respiratory roots).
Lenticels are also present on many fruits, quite noticeably on many apples and pears. On European pears, they can serve as an indicator of when to pick the fruit, as light lenticels on immature fruit darken and become brown. Certain bacterial and fungal infections can penetrate fruits through their lenticels, with susceptibility sometimes increasing with its age.
Lenticels are also present on potato tubers.
- "Lenticel". The American Heritage Science Dictionary, Houghton Mifflin Company, via dictionary.com. Retrieved on 2007-10-11
- Arthur C. Gibson. "Bark features". General Botany.
- Esau, K. (1953), Plant Anatomy, John Wiley & Sons Inc. New York, Chapman & Hall Ltd. London
- Michael G. Andreu, Erin M. Givens, and Melissa H. Friedman. "How to Identify a Tree". University of Florida IFAS extension.
- Pyzner, John. (2005-04-19.) "Pick pears before completely ripe, advises LSU AgCenter horticulturist". Louisiana State University Agricultural Center website. Retrieved on 2007-10-11.
- Irtwange, S. V. (February, 2006.) "Application of modified atmosphere packaging and related technology in postharvest handling of fresh fruits and vegetables". Agricultural Engineering International: the CIGR Ejournal. Invited Overview No. 4. Vol. VIII, page 8. Retrieved on 2007-10-11.
- Adams, M. J. (1975). "Potato tuber lenticels: Development and structure". Annals of Applied Biology 79 (3): 265. doi:10.1111/j.1744-7348.1975.tb01582.x.
- Raven, Peter H.; Ray F. Evert, Susan E. Eichorn (2005). Biology of Plants 7th Ed. W.H. Freeman and Company Publishers. pp. 586–587. ISBN 0-7167-1007-2.
|This botany article is a stub. You can help Wikipedia by expanding it.|