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Glandular Morphology from a Perennial Alfalfa Clone Resistant to the Potato Leafhopper

^a 1–87 Agriculture Building, Dep. of Entomology, Univ. of Missouri, Columbia, MO, 65211
^b 501 Agricultural Sciences and Industries Building, Dep. of Entomology, Penn. State Univ., University Park, PA 16802-3508

View larger version (113K): [in a new window]   Fig. 1. Cryogenic scanning electron microscopy (SEM) of erect glandular trichomes from the resistant alfalfa clone FGplh13 detailing the enlarged basal cell (ebc) (Bar = 50 µm; x200).

View larger version (119K): [in a new window]   Fig. 2. Light microscopy of a longitudinally sectioned erect glandular trichome, documenting the multicellular stalk found on the resistant alfalfa clone FGplh13 (Bar = 30 µm; x400).

View larger version (197K): [in a new window]   Fig. 3. Transmission electron microscopy (TEM) of a longitudinally sectioned erect gland head from the resistant alfalfa clone FGplh13. Note distinct tiers of cells (Bar = 10 µm; x2,500).

View larger version (134K): [in a new window]   Fig. 4. Cryogenic scanning electron microscopy (SEM) of a procumbent glandular trichome, showing two distinct tiers of cells in the gland head, located on the resistant alfalfa clone FGplh13 (Bar = 10 µm; x1,000).

View larger version (88K): [in a new window]   Fig. 5. Procumbent glandular trichome longitudinal section, detailing two stalk cells and three tiers of gland head cells, on the resistant alfalfa clone FGplh13 (Bar = 25 µm; x430).

View larger version (109K): [in a new window]   Fig. 6. Light micrograph of a cross section from a procumbent gland head on the resistant alfalfa clone FGplh13. The section, taken from the distal tier of cells, reveals four cells. (Bar = 25 µm; x430).

View larger version (136K): [in a new window]   Fig. 7. Transmission electron microscopy (TEM) of a longitudinally sectioned procumbent gland head on a resistant alfalfa clone FGplh13. Note difference in cell size between the basal and distal tiers (Bar = 2 µm; x5,000).

View larger version (148K): [in a new window]   Fig. 8. Numerous cuticular boils associated with the distal portion of an erect gland head on the alfalfa clone FGplh13 (Bar = 10 µm; x1,000).

View larger version (126K): [in a new window]   Fig. 9. Subcuticular space from an erect gland head located on the alfalfa clone FGplh13 observed using transmission electron microscopy (TEM). Note dense, crystalline exudate (ex), cell wall (cw), cuticle (c), and vacuole (v) (Bar = 200 nm; x20,000).

View larger version (177K): [in a new window]   Fig. 10. Cuticular boil on the distal portion of a procumbent gland head on the resistant alfalfa clone FGplh13, which potentially formed due to the presence of an exudate (Bar = 25 µm; x1,500).

View larger version (135K): [in a new window]   Fig. 11. Release of an exudate from a procumbent glandular trichome onto the epidermal surface of the resistant alfalfa clone FGplh13 (Bar = 25 µm; x1,000).

View larger version (159K): [in a new window]   Fig. 15. Cryogenic scanning electron microscopy (SEM) detailing the exudate (ex) from a procumbent (pr) glandular trichome on the alfalfa clone FGplh13 attached to the tibia (ti) of a potato leafhopper nymph (Bar = 25 µm; x200).

View larger version (144K): [in a new window]   Fig. 12. Transmission electron microscopy (TEM) recording the presence of an exudate from a procumbent glandular trichome to occupy a subcuticular space on the resistant alfalfa clone FGplh13. Note exudate (ex), cell wall (cw), and cuticle (c) (Bar = 250 nm; x30,000).

View larger version (161K): [in a new window]   Fig. 13. Entrapment of a first instar potato leafhopper in the glandular trichomes found on the alfalfa clone FGplh13. Note size of erect (e) and procumbent (pr) glandular trichomes in relation to potato leafhopper nymph (Bar = 60 µm; x100).

View larger version (138K): [in a new window]   Fig. 14. Attachment of tarsi (ta) and stylets (st) of a first instar potato leafhopper following contact with the glandular trichomes on the alfalfa clone FGplh13. Note contact between the abdomen (ab) of the insect and an erect glandular trichome (Bar = 30 µm; x150).