Elevated CO₂ alters the feeding behaviour of the pea aphid by modifying the physical and chemical resistance of Medicago truncatula

Elevated CO₂ compromises the resistance of leguminous plants against chewing insects, but little is known about whether elevated CO₂ modifies the resistance against phloem‐sucking insects or whether it has contrasting effects on the resistance of legumes that differ in biological nitrogen fixation....

Full description

Saved in:
Bibliographic Details
Published in:Plant, cell and environment cell and environment, 2014-09, Vol.37 (9), p.2158-2168
Main Authors: GUO, HUIJUAN, SUN, YUCHENG, LI, YUEFEI, LIU, XIANGHUI, WANG, PINGYAN, ZHU‐SALZMAN, KEYAN, GE, FENG
Format: Article
Language:English
Subjects:
Acyrthosiphon pisum
Animals
Aphididae
Aphids - drug effects
Aphids - physiology
Biological and medical sciences
carbon dioxide
Carbon Dioxide - pharmacology
Cyclopentanes - metabolism
Ethylenes - metabolism
feeding behavior
Feeding Behavior - drug effects
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Plant - drug effects
ingestion
insects
legume plant
legumes
mastication
Medicago truncatula
Medicago truncatula - drug effects
Medicago truncatula - genetics
Medicago truncatula - growth & development
Medicago truncatula - physiology
mutants
nitrogen fixation
Oxylipins - metabolism
phloem
Phloem - drug effects
Phloem - physiology
Pisum sativum - parasitology
Plant Growth Regulators - pharmacology
Plant Leaves - drug effects
Plant Leaves - ultrastructure
resistance
Salicylic Acid - metabolism
sap
Signal Transduction - drug effects
Signal Transduction - genetics
trichome
trichomes
Trichomes - drug effects
Trichomes - physiology
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Elevated CO₂ compromises the resistance of leguminous plants against chewing insects, but little is known about whether elevated CO₂ modifies the resistance against phloem‐sucking insects or whether it has contrasting effects on the resistance of legumes that differ in biological nitrogen fixation. We tested the hypothesis that the physical and chemical resistance against aphids would be increased in Jemalong (a wild type of Medicago truncatula) but would be decreased in dnf1 (a mutant without biological nitrogen fixation) by elevated CO₂. The non‐glandular and glandular trichome density of Jemalong plants increased under elevated CO₂, resulting in prolonged aphid probing. In contrast, dnf1 plants tended to decrease foliar trichome density under elevated CO₂, resulting in less surface and epidermal resistance to aphids. Elevated CO₂ enhanced the ineffective salicylic acid‐dependent defence pathway but decreased the effective jasmonic acid/ethylene‐dependent defence pathway in aphid‐infested Jemalong plants. Therefore, aphid probing time decreased and the duration of phloem sap ingestion increased on Jemalong under elevated CO₂, which, in turn, increased aphid growth rate. Overall, our results suggest that elevated CO₂ decreases the chemical resistance of wild‐type M. truncatula against aphids, and that the host's biological nitrogen fixation ability is central to this effect.
ISSN:0140-7791
1365-3040
DOI:10.1111/pce.12306