Dynamic Plant Defense Strategies Against Insect Herbivory: From Recognition and Signaling to Host Plant Resistance
Keywords:
Host-Plant Resistance, Insect Herbivory, Secondary Metabolites, Jasmonic Acid, Herbivore-Induced Volatiles, Biological ControlAbstract
Plants are continuously exposed to herbivorous insects and have evolved multilayered defense systems that operate before, during and after attack. These defenses range from constitutive structural barriers, including trichomes, epicuticular waxes, lignification and latex, to inducible biochemical and molecular responses involving secondary metabolites, proteinase inhibitors, defensive enzymes, reactive oxygen species (ROS) and phytohormonal signaling. Recognition of herbivory depends on mechanical damage and herbivore- or oviposition-associated molecular patterns, which activate rapid electrical, calcium and ROS signals and subsequently engage jasmonate-, salicylate- and ethylene-dependent pathways. Plants also defend themselves indirectly by emitting herbivore-induced plant volatiles and providing extrafloral nectar that recruit predators and parasitoids. The chapter synthesizes these mechanisms and illustrates their functional significance through examples from rice, maize, wheat and cotton. The integrated view presented here emphasizes that plant resistance is not controlled by a single trait; rather, it is an emergent property of interacting structural, chemical, signaling and ecological processes. Understanding this network provides a foundation for host-plant resistance breeding and for integration of plant defense traits into sustainable insect pest management
References
Agrawal, A. A., Fishbein, M., Jetter, R., Salminen, J. P., Goldstein, J. B., Freitag, A. E., et al. (2009). Phylogenetic ecology of leaf surface traits in the milkweeds (Asclepias spp.): chemistry, ecophysiology, and insect behavior. New Phytologist, 183, 848–867.
Almagro, L., Gómez Ros, L. V., Belchi-Navarro, S., Bru, R., Ros Barceló, A., & Pedreño, M. A. (2009). Class III peroxidases in plant defence reactions. Journal of Experimental Botany, 60, 377–390.
Beran, F., & Petschenka, G. (2022). Sequestration of plant defense compounds by insects: From mechanisms to insect–plant coevolution. Annual Review of Entomology, 67, 163–180.
Bradford, K. J. (2008). Shang Fa Yang: Pioneer in plant ethylene biochemistry. Plant Science, 175, 2–7.
Chamarthi, S. K., Sharma, H. C., Sahrawat, K. L., Narasu, M. L., & Dhillon, M. K. (2010). Physico-chemical mechanisms of resistance to shoot fly, Atherigona soccata in sorghum, Sorghum bicolor. Journal of Applied Entomology, 135, 446–455.
Farmer, E. E., Gao, Y. Q., Lenzoni, G., Wolfender, J. L., & Wu, Q. (2020). Wound- and mechanostimulated electrical signals control hormone responses. New Phytologist, 227, 1037–1050.
Feussner, I., & Wasternack, C. (2002). The lipoxygenase pathway. Annual Review of Plant Biology, 53, 275–297.
Gish, M., Mescher, M. C., & De Moraes, C. M. (2015). Targeted predation of extrafloral nectaries by insects despite localized chemical defences. Proceedings of the Royal Society B, 282, 20151835.
Gorb, E. V., & Gorb, S. N. (2017). Anti-adhesive effects of plant wax coverage on insect attachment. Journal of Experimental Botany.
Gulsen, O., Eickhoff, T., Heng-Moss, T., Shearman, R., Baxendale, F., Sarath, G., et al. (2010). Characterization of peroxidase changes in resistant and susceptible warm-season turfgrasses challenged by Blissus occiduus. Arthropod-Plant Interactions, 4, 45–55.
Hanley, M. E., Lamont, B. B., Fairbanks, M. M., & Rafferty, C. M. (2007). Plant structural traits and their role in anti-herbivore defence. Perspectives in Plant Ecology, Evolution and Systematics, 8, 157–178.
Heil, M., & Land, W. G. (2014). Danger signals—Damaged-self recognition across the tree of life. Frontiers in Plant Science, 5, 578.
Howe, G. A., & Jander, G. (2008). Plant immunity to insect herbivores. Annual Review of Plant Biology, 59, 41–66.
Huffaker, A., Pearse, I. S., & Ryan, C. A. (2011). Plant elicitor peptides regulate direct and indirect antiherbivore defense. Proceedings of the National Academy of Sciences, 108, 20120–20125.
Kost, C., & Heil, M. (2008). The defensive role of volatile emission and extrafloral nectar secretion for lima bean in nature. Journal of Chemical Ecology, 34, 2–13.
Li, N., Han, X., Feng, D., Yuan, D., & Huang, L.-J. (2019). Hormonal crosstalk in plant defense signaling.
Ramos, M. V., et al. (2007). Performance of distinct crop pests reared on diets enriched with latex proteins from Calotropis procera: role of laticifer proteins in plant defense. Plant Science, 173, 349-357.
Raza, M. A. S., Ibrahim, M. A., Ditta, A., et al. (2023). Exploring the recuperative potential of brassinosteroids and nano-biochar on growth, physiology, and yield of wheat under drought stress. Scientific Reports, 13, 15015.
Sharma, H. C., Sujana, G., & Rao, D. M. (2009). Morphological and chemical components of resistance to pod borer, Helicoverpa armigera in wild relatives of pigeonpea. Arthropod-Plant Interactions, 3, 151-161.
Shivaji, R., Camas, A., Ankala, A., Engelberth, J., Tumlinson, J. H., Williams, W. P., et al. (2010). Plants on constant alert: elevated levels of jasmonic acid and jasmonate-induced transcripts in caterpillar-resistant maize. Journal of Chemical Ecology, 36, 179-191.
Traw, M. B. (2002). Is induction response negatively correlated with constitutive resistance in black mustard? Evolution, 56, 2196-2205.
Zebelo, S. A., & Maffei, M. E. (2015). Role of early signalling events in plant-insect interactions. Journal of Experimental Botany, 66, 435-448.
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