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Do Conspecific Herbivores Track Resource Depletion through Host Phenology-Specific HIPVs?


Affiliations
1 Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India
2 Division of Fruit Crops, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India
 

Conspecific herbivores use herbivore-induced plant volatiles (HIPVs) as cues while selecting an optimal site for oviposition. This is to ascertain the availability of nourishment for their progeny so that they get the best chance at survival. In the present study, phytophagous eulophid seed-borer Anselmella kerrichi was significantly (time spent: F3,40 = 13.12, P < 0.0001; number of entries: F2,30 = 4.21; P = 0.02) attracted to HIPVs from immature fruits of Java plum, Syzygium cuminii (time spent: 4.77 ± 0.40 min; number of entries: 2.27 ± 0.24) when also given the choice of mature fruits (time spent: 1.76 ± 0.32 min; number of entries: 1.46 ± 0.16), indicating that herbivores can assess re-source depletion from host phenology-specific HIPVs. The chemical cues like α-pinene, β-pinene, (z)-ocimene, undecane, 3,7-dimethyl decane, neo-allo-ocimene, allo-ocimene, ethyl benzoate, 2,6,11-trime¬thyldodecane, α-copaene and β-caryophyllene, which are present in immature fruit volatiles elicited antennal response in a GC-EAD analysis. Olfactometer analyses with the synthetic compounds also revealed that A. kerrichi was significantly attracted to these cues and the synthetic blend composed of the above compounds proved to be much more efficient in attracting female wasps when compared to a natural blend. Field evaluations using the synthetic blend showed that it could attract a significant number of A. kerrichi, indicating the scope of using this blend of synthetic HIPVs as a sustainable IPM tool

Keywords

Anselmella kerrichi, Herbivore-Induced Plant Volatiles, Host Phenology, Resource Depletion, Syzygium cuminii.
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  • Do Conspecific Herbivores Track Resource Depletion through Host Phenology-Specific HIPVs?

Abstract Views: 226  |  PDF Views: 95

Authors

P. D. Kamala Jayanthi
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India
Anjana Subramoniam
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India
P. Saravan Kumar
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India
B. R. Jayanthimala
Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India
A. Rekha
Division of Fruit Crops, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bengaluru 560 089, India, India

Abstract


Conspecific herbivores use herbivore-induced plant volatiles (HIPVs) as cues while selecting an optimal site for oviposition. This is to ascertain the availability of nourishment for their progeny so that they get the best chance at survival. In the present study, phytophagous eulophid seed-borer Anselmella kerrichi was significantly (time spent: F3,40 = 13.12, P < 0.0001; number of entries: F2,30 = 4.21; P = 0.02) attracted to HIPVs from immature fruits of Java plum, Syzygium cuminii (time spent: 4.77 ± 0.40 min; number of entries: 2.27 ± 0.24) when also given the choice of mature fruits (time spent: 1.76 ± 0.32 min; number of entries: 1.46 ± 0.16), indicating that herbivores can assess re-source depletion from host phenology-specific HIPVs. The chemical cues like α-pinene, β-pinene, (z)-ocimene, undecane, 3,7-dimethyl decane, neo-allo-ocimene, allo-ocimene, ethyl benzoate, 2,6,11-trime¬thyldodecane, α-copaene and β-caryophyllene, which are present in immature fruit volatiles elicited antennal response in a GC-EAD analysis. Olfactometer analyses with the synthetic compounds also revealed that A. kerrichi was significantly attracted to these cues and the synthetic blend composed of the above compounds proved to be much more efficient in attracting female wasps when compared to a natural blend. Field evaluations using the synthetic blend showed that it could attract a significant number of A. kerrichi, indicating the scope of using this blend of synthetic HIPVs as a sustainable IPM tool

Keywords


Anselmella kerrichi, Herbivore-Induced Plant Volatiles, Host Phenology, Resource Depletion, Syzygium cuminii.

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DOI: https://doi.org/10.18520/cs%2Fv121%2Fi2%2F286-293