Distortion of trichome morphology by the hairless mutation of tomato affects leaf surface chemistry

• Autor: Kang, Jin-Ho ; Shi, Feng ; Jones, A. Daniel ; Marks, M. David ; Howe, Gregg A
• Assuntos: Acyl sugar ; Animal glands ; Animals ; Arthropoda ; BASIC BIOLOGICAL SCIENCES ; Biological and medical sciences ; Fundamental and applied biological sciences. Psychology ; Herbivores ; herbivory ; Insect morphology ; jasmonate ; Leaves ; Lycopersicon esculentum ; Lycopersicon esculentum - anatomy & histology ; Lycopersicon esculentum - chemistry ; Lycopersicon esculentum - genetics ; Lycopersicon esculentum - parasitology ; Manduca sexta ; Monoterpenes - analysis ; Monoterpenes - metabolism ; Moths - physiology ; Mutation ; phenolics ; Phytophagous insects ; plant defence ; Plant Diseases - parasitology ; Plant Epidermis - anatomy & histology ; Plant Epidermis - chemistry ; Plant Epidermis - genetics ; Plant Epidermis - parasitology ; Plant glands ; Plant Leaves - anatomy & histology ; Plant Leaves - chemistry ; Plant Leaves - genetics ; Plant Leaves - parasitology ; Plant morphology ; Plant Sciences ; Plants ; plant–insect interaction ; Research Papers ; secondary metabolite ; Sesquiterpenes ; Solanum ; terpene ; tomato ; trichome ; Trichomes
• É parte de: Journal of experimental botany, 2010-02, Vol.61 (4), p.1053-1064
• Notas: ark:/67375/HXZ-0QRZM7LD-8
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  FG02-91ER20021
  USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
  
• Descrição: Trichomes are specialized epidermal structures that function as physical and chemical deterrents against arthropod herbivores. Aerial tissues of cultivated tomato (Solanum lycopersicum) are populated by several morphologically distinct trichome types, the most abundant of which is the type VI glandular trichome that produces various specialized metabolites. Here, the effect of the hairless (hl) mutation on trichome density and morphology, chemical composition, and resistance to a natural insect herbivore of tomato was investigated. The results show that the major effect of hl on pubescence results from structural distortion (bending and swelling) of all trichome types in aerial tissues. Leaf surface extracts and isolated type VI glands from hl plants contained wild-type levels of monoterpenes, glycoalkaloids, and acyl sugars, but were deficient in sesquiterpene and polyphenolic compounds implicated in anti-insect defence. No-choice bioassays showed that hl plants are compromised in resistance to the specialist herbivore Manduca sexta. These results establish a link between the morphology and chemical composition of glandular trichomes in cultivated tomato, and show that hl-mediated changes in these leaf surface traits correlate with decreased resistance to insect herbivory.
  
• Editor: Oxford: Oxford University Press
  
• Idioma: Inglês