Plant Defense Mechanisms

Plant Image Collection

Plant Defense Mechanisms

Media

Populus tremuloides (quaking aspen) Laterally compressed petioles allow any breeze to cause leaves to vibrate or "quake". This movement makes it difficult for insects to land on or crawl on leaf surfaces.

12-002h

Populus grandidentata (big tooth aspen) Trichomes may form a dense mat that is a physical barrier to insects

12-003h

Populus alba with trichomes that remain on leaf.

12-004h

Populus grandidentata (young leaf) Dense mat of trichomes that abscise when leaf is fully expanded

12-005h

Populus grandidentata Young leaf with trichomes prior to abscission. Note constricted base of trichome - where abscission will occur.

12-006h

Populus deltoides Stem showing resin secreted by stipular bud scales.

12-007h

Populus deltoides Adaxial side of stipular bud scale with newly-secreted resin.

12-008h

Populus deltoides Cross section of stipular buds scales - dark adaxial epidermis is composed of resin secretory cells.

12-009h

Populus deltoides higher magnification of adaxial surface of stipular bud scale. Dark cells are resin-secreting epidermis, light line above epidermis is cuticle pushed off by secretory product.

12-010h

Populus deltoides bud cross section with stipular bud scales and young leaf lamina

12-011h

Populus deltoides higher magnification. Structures with dark stained adaxial epidermis is stipular bud scales.

12-012h

Populus deltoides bud anatomy (from Curtis & Lersten, Amer. J. Bot. 61:835-845. 1974) Fig. 1 represents dissected terminal bud (in cross section in Fig. 3). Fig. 2 represents dissected axillary bud.

12-013h

Populus deltoides leaf tooth clearing. Tooth tip is terminated by a resin gland.

12-014h

Populus deltoides 1 um paradermal section of leaf tooth showing resin secreting cells.

12-015h

Populus tremuloides resin glands on leaf teeth. These produce only small amounts of resin.

12-016h

Salix lucida stem, leaf margin and stipules with resin glands (from Curtis and Lersten, Amer. J. Bot. 67:1289-1296. 1980).

12-017h

Salix lucida adaxial view of stipule with resin glands.

12-018h

Salix lucida leaf lamina margin with resin glands.

12-019h

Salix lucida leaf margin resin gland (SEM) secreting a strand of resin.

12-020h

Populus grandidentata extra floral nectaries on young leaf (from Curtis & Lersten. Amer. J. Bot. 65:10http://pix.botany.org/set03/03-1010).

12-021h

Populus grandidentata leaf with ant feeding on extra floral nectaries.

12-022h

Populus grandidentata longitudinal section of extra floral nectary. Note abundant phloem.

12-023h

Populus grandidentata secreting extra floral nectaries.

12-024h

Populus tremuloides extra floral nectaries. Only small quantities of nectar are secreted (if any).

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Creation and update

Creation: Created by admin on Oct 23, 2013
Last update: Updated by admin on Oct 23, 2013

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