What chemical compounds are included in herbivore induced plant volatiles?5 answersHerbivore-induced plant volatiles (HIPVs) encompass a variety of chemical compounds that play crucial roles in plant defense mechanisms and tritrophic interactions. These compounds include α-pinene, decanal, and phthalic acid in chili pepper cultivars, alkane, alkene, alcohol, and terpene groups in Si-amended rice plants, (Z)-3-hexenol, (Z)-3-hexenyl acetate, (Z)-3-hexenyl propanoate, (Z)-3-hexenyl butanoate, hexyl butanoate, methyl salicylate, and methyl jasmonate in sweet pepper plants, as well as (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT) in tea plants. These compounds are released by plants in response to herbivory to attract predators and parasitoids, induce defense responses in neighboring plants, and enhance plant resistance to herbivorous insects. Understanding the diverse array of chemical compounds involved in HIPVs is essential for developing sustainable pest management strategies in agriculture.
How does herbivory change volatile profiles and taste in vegetables?5 answersHerbivory significantly impacts the volatile profiles and taste of vegetables. Studies have shown that herbivory alters the emission of volatile organic compounds (VOCs) in plants, with specific blends known as herbivore-induced plant volatiles (HIPVs) playing a crucial role in mediating plant-insect interactions. The composition of these VOCs can vary depending on the herbivore species, feeding mode, and plant response mechanisms. Additionally, herbivory can lead to changes in the taste of vegetables by influencing the production of specific compounds in response to different types of herbivores. These alterations in volatile profiles not only serve as cues for natural enemies of herbivores but also impact the overall flavor and sensory characteristics of vegetables, highlighting the intricate interplay between herbivory, plant chemistry, and taste perception.
How does herbivory impact volatile emissions in rocket salad?5 answersHerbivory has been found to impact volatile emissions in rocket salad. When rocket salad plants are subjected to herbivory, they release herbivore-induced plant volatiles (HIPVs) as a defense mechanism. These HIPVs serve as communication signals between the plants and their natural enemies, neighboring plants, and different parts of the damaged plant. The emission of HIPVs is an immediate response of plants to herbivory and can act as feeding and oviposition deterrents to insect pests. Additionally, herbivory can modify the composition of volatile emissions, as seen in the case of the Australian medicinal tea tree, where herbivores influenced the composition of volatile emissions in one chemotype. Overall, herbivory has a significant impact on volatile emissions in rocket salad, influencing plant defense mechanisms and interactions with other organisms.
How does herbivory impact volatile emissions in kale?5 answersHerbivory has been shown to impact volatile emissions in kale. When kale plants are damaged by herbivores, they emit volatile organic compounds (VOCs) that can attract natural enemies of the herbivores. The timing of volatile emissions in kale is important for an effective defense response. Green leaf volatiles (GLVs) are emitted by plants upon damage, but their abundance and composition can vary depending on the timing of herbivore attack. Additionally, herbivore feeding can modulate VOC emissions in kale, leading to changes in the volatile blends emitted by the plant. These modified volatile blends can influence the foraging success of carnivorous natural enemies of herbivorous insects. Overall, herbivory can have a significant impact on the volatile emissions of kale, affecting both the plant's defense response and interactions with other organisms in its environment.
Why do some ferns show more herbivory than others?5 answersSome ferns show more herbivory than others due to differences in their defense mechanisms and leaf traits. Ferns often use a combination of chemical defenses, such as phytoecdysteroids, flavonoids, thiaminase, cyanogenic glycosides, and alkaloids, to protect against herbivores. The abundance and damage signatures of external feeding, piercing and sucking, galling, and mining on modern ferns can enhance our understanding of damage patterns on fossil leaves. Leaf damage in ferns is positively correlated with leaf nitrogen content, but not with leaf lifespan. Different fern species exhibit different defense syndromes, such as high nutritional quality with variable trichome density, low nutritional quality with high phenol concentrations and trichome density, and intermediate nutritional quality with low trichome density or being glabrous. Ferns have been shown to have a high germination success of spores after passing through the gut of herbivores, indicating endozoochorous dispersal as a widespread phenomenon among fern-eating herbivores.
Is the herbivorous insects prevalence dependant of season changes?3 answersHerbivorous insect prevalence is influenced by seasonal changes. The abstract states that the damage caused by insects to shrub species varied depending on the species and the light conditions. Some shrub species had low levels of leaf damage, while others had high levels. The concentrations of defense metabolites in the leaves were higher in species growing in high light conditions, which may have contributed to lower levels of damage. Additionally, leaves growing in full sun were less injured than those in shade, possibly due to higher concentrations of defense metabolites and lower concentrations of nitrogen. These findings suggest that seasonal changes, particularly light conditions, can affect the constitutive defense of shrub species against folivorous insects.