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Pest Manag Sci. 2018 Nov;74(11):2511-2519. doi: 10.1002/ps.4932. Epub 2018 Jun 1.

Juvenile hormone mediates the positive effects of nitrogen fertilization on weight and reproduction in pea aphid.

Gao J1,2, Guo HJ1, Sun YC1, Ge F1,2.

Author information

1
State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
2
University of Chinese Academy of Sciences, Beijing, China.

Abstract

BACKGROUND:

The positive effects of nitrogen fertilization on the performance of phytophagous insects have been reported extensively; the physiological and molecular basis involved, however, is largely unclear. Here, we test experimentally whether enhancement of juvenile hormone (JH) is responsible for the increased weight and fecundity of pea aphid (Acyrthosiphon pisum) under nitrogen fertilization.

RESULTS:

Aphids fed on Medicago truncatula with nitrogen fertilization have a greater amino acid content, higher weight at the fourth instar and adult stage, and produce more offspring than those without nitrogen fertilization. Furthermore, nitrogen fertilization upregulates the transcripts of JH biosynthesis-related genes and increases JH titre at the fourth instar and adult stage, suggesting that JH is involved in the positive responses of aphids to nitrogen fertilization. Application of 100 ng JH increases adult weight and fecundity in aphids fed on M. truncatula without nitrogen fertilization. Conversely, impairing JH signalling by pharmacologically inhibiting the target of rapamycin pathway or by knocking down JH biosynthetic gene decreases adult weight and fecundity in aphids fed on M. truncatula with nitrogen fertilization, whereas application of JH rescued the phenotype.

CONCLUSION:

The increased JH titre at the fourth instar and adult stage is required for the increases of weight and fecundity of A. pisum under nitrogen fertilization. © 2018 Society of Chemical Industry.

KEYWORDS:

amino acid; fecundity; juvenile hormone; nitrogen fertilization; pea aphid; weight

PMID:
29656587
DOI:
10.1002/ps.4932
[Indexed for MEDLINE]

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