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  • terpenoid aldehydes  (2)
  • Springer  (2)
  • Canadian Science Publishing
  • 1
    Electronic Resource
    Electronic Resource
    Influence of previous herbivory on behavior and development of Spodoptera exigua larvae on glanded and glandless cotton (2000)
    Springer
    Entomologia experimentalis et applicata 97 (2000), S. 283-291 
    Details
    ISSN: 1570-7458
    Keywords: cotton ; Spodoptera exigua ; Gossypium hirsutum ; beet armyworm ; pigment glands ; systemic defense ; induced response ; terpenoid aldehydes ; feeding preference ; feeding deterrence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined the influence of previous herbivore injury on the feeding behavior, survival and development of larval beet armyworm, Spodoptera exiguaHübner (Lepidoptera: Noctuidae), on glanded and glandless `Stoneville 213' cotton, Gossypium hirsutumL. In a greenhouse study, neonate S. exiguaplaced on the terminal foliage of glanded cotton plants moved down the plant to feed on older leaves. The location of feeding was more concentrated towards the bottom of the plant on previously damaged plants than on undamaged control plants. In contrast, larval feeding on glandless plants was evenly distributed within the plant and no difference in distribution was noted on plants that had sustained previous herbivore injury when compared to undamaged plants. In a laboratory study, where larvae were offered one type of foliage in a no-choice situation, survival on young or mature leaves from glanded or glandless plants, with or without previous herbivore injury, did not differ significantly. However, pupae of larvae reared on young leaves of damaged glanded cotton weighed significantly less than pupae from larvae fed all other diets. Pupae from larvae fed young leaves of control glandless plants weighed significantly more than pupae from all other diets. Similar trends were observed in adult weights. In addition, time to pupation and time to adult emergence were significantly longer for larvae fed young leaves from damaged glanded plants compared to all other diets. The experiments reported here link larval feeding behavior of S. exiguato performance. Larval feeding preferences changed following induction of systemic defense such that food choice was optimized for growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004051527347
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  • 2
    Electronic Resource
    Electronic Resource
    Systemic Induction of Terpenoid Aldehydes in Cotton Pigment Glands by Feeding of Larval Spodoptera exigua (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2861-2879 
    Details
    ISSN: 1573-1561
    Keywords: Gossypium hirsutum ; cotton ; Spodoptera exigua ; beet army-worm ; gossypol ; heliocides ; terpenoid aldehydes ; pigment glands ; systemic induction ; plant defense ; plant–insect interactions ; plant resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Pigment glands in cotton contain terpenoid aldehydes that are toxic and deterrent to feeding of several generalist lepidopteran insects. We hypothesized that previously observed systemically induced feeding deterrence may be associated with pigment glands. We conducted experiments to determine the dynamics and chemical nature of inducible feeding deterrents in leaves of cotton, Gossypium hirsutum L, to larvae of the beet armyworm, Spodoptera exigua. Production and/or filling of pigment glands was influenced by physiological age of Deltapine 90 cotton plants. In undamaged plants, successively formed leaves contained more pigment glands, up to the seventh or eighth true-leaf developmental stage. Feeding choice tests conducted one or seven days after initial feeding damage revealed that third instars of S. exigua consumed more of the two youngest leaves from control cotton plants than from plants whose two oldest leaves had been fed on previously for 24 hr by S. exigua. The preference for leaves from control plants was significant one day after initial damage and highly significant seven days after damage. Consumption of mature foliage (leaf immediately above initially damaged leaves) from control plants and damaged plants did not differ. More pigment glands were counted on the youngest leaf of damaged plants than on the youngest leaf of control plants one day after initial damage. HPLC analysis revealed greater amounts of hemigossypolone, heliocides 1 and 2 (H1 and H2), and total terpenoid aldehydes per gland in young foliage of damaged plants than control plants one day after initial injury. By seven days after initial injury, greater quantities of hemigossypolone and all heliocides except H4 were detected in young foliage from damaged plants compared to control plants. Concentrations of H1 per gland in young leaves from damaged plants increased the most of all terpenoid aldehydes measured (3.4× the amount found in leaves from control plants). Mature leaves from damaged plants did not contain more terpenoid aldehydes than mature leaves from control plants. We suggest that systemically induced feeding deterrence to S. exigua in young leaves of glanded cotton was due to increased amounts of terpenoid aldehydes in pigment glands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022575313325
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    Paper (German National Licenses)
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