Temporal dynamics of herbivore-induced responses in Brassica juncea and their effect on generalist and specialist herbivores

被引:39
作者
Mathur, Vartika [1 ,2 ]
Ganta, Satish [3 ]
Raaijmakers, Ciska E. [2 ]
Reddy, A. Sankara [5 ]
Vet, Louise E. M. [2 ,4 ]
van Dam, Nicole M. [6 ]
机构
[1] Univ Delhi, Sri Venkateswara Coll, Dept Zool, New Delhi 110021, India
[2] Netherlands Inst Ecol, Dept Terr Ecol, NL-6700 AB Wageningen, Netherlands
[3] Univ Delhi, Zakir Husain Coll, Dept Zool, New Delhi 110002, India
[4] Univ Wageningen & Res Ctr, Entomol Lab, NL-6700 EH Wageningen, Netherlands
[5] EIILM Univ, Sikkim 737121, India
[6] Radboud Univ Nijmegen, Inst Water & Wetland Res, Dept Ecogenom, NL-6500 GL Nijmegen, Netherlands
关键词
systemic induced responses; timing of responses; brown mustard; Indian mustard; glucosinolate induction; trichome induction; Spodoptera litura; Spodoptera exigua; Plutella xylostella; feeding preference; insect performance; PLANT DEFENSE; OILSEED RAPE; GLUCOSINOLATE; VOLATILES; INDUCTION; INSECT; ROOT; PERFORMANCE; COTYLEDONS; RESISTANCE;
D O I
10.1111/j.1570-7458.2011.01122.x
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Herbivore feeding may induce an array of responses in plants, and each response may have its own temporal dynamics. Precise timing of these plant responses is vital for them to have optimal effect on the herbivores feeding on the plant. This study measured the temporal dynamics of various systemically induced responses occurring in Brassica juncea (L.) Czern. (Brassicaceae) leaves after insect herbivory in India and The Netherlands. Morphological (trichomes, leaf size) and chemical (glucosinolates, amino acids, sugars) responses were analysed. The effects of systemic responses were assessed using a specialist [Plutella xylostella L. (Lepidoptera: Plutellidae)] and a generalist [Spodoptera litura Fabricius (Lepidoptera: Noctuidae)] herbivore. We tested the hypotheses that morphological responses were slower than chemical responses and that generalist herbivores would be more affected by induced responses than specialists. Glucosinolates and trichomes were found to increase systemically as quickly as 4 and 7 days after herbivore damage, respectively. Amino acids, sugars, and leaf size remained unaffected during this period. The generalist S. litura showed a significant feeding preference for undamaged leaves, whereas the specialist herbivore P. xylostella preferred leaves that were damaged 9 days before. Performance bioassays on generalist S. litura revealed that larvae gained half the weight on leaves from damaged plants as compared to larvae feeding on leaves from undamaged plants. These studies show that although morphological responses are somewhat slower than chemical responses, they also contribute to induced plant resistance in a relatively short time span. We argue that before considering induced responses as resistance factors, their effect should be assessed at various points in time with both generalist and specialist herbivores.
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页码:215 / 225
页数:11
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