Peltate glands

Voirin, B., Bayet, C., and Colson, M., Demonstration that flavone aglycones accumulate in the peltate glands of Mentha x piperita leaves.. Phytochemistry, 34, 85, 1993. 

Plants have served as a food source for fish. Insects, and mammals since early biotic times. In response plants have developed intricate physical as well as chemical protective mechanisms. The two defensive structures that are the primary subject of this chapter are trichomes and glands. Trichomes are epidermal appendages of diverse form and structure, such as protective and glandular hairs and scales or peltate hair. 

Fig. 94.2 Glandular trichomes of sage Salvia officinalis) store essential oil composed of mono-terpenes. (a) Peltate glandular trichomes forming oil glands on lower leaf surface of sage, (b) Peltate glandular trichomes, capitate glandular trichomes and non-glandular trichomes on leaf veins of sage...

In aromatic herbs, members of the family Lamiaceae, the EOs can be foimd in two t3 es of glandular trichomes on the surface of their leaves, termed Ihe peltate and capitate glands (Gang et al. 2001). Figure 13.2 shows several terpenes present in EOs obtained from herbs of family Lamiaceae. These compounds are extremely volatile and have been demonstrated to possess multiple functional properties, including antioxidant (Riahi et al. 2013, Alves-Silva et al. 2013), antimicrobial (Ruiz-Navajas et al. 2012 Ballester-Costa et al. 2013), antitumor (Nikolic etal 2014), and antiviral (Usachev etal. 2013). 

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