NDLI: Aphid effects on rhizosphere microorganisms and microfauna depend more on barley growth phase than on soil fertilization

Content Provider	Springer Nature Link
Author	Vestergård, Mette Bjørnlund, Lisa Christensen, Søren
Copyright Year	2004
Abstract	This paper gives the first reports on aphid effects on rhizosphere organisms as influenced by soil nutrient status and plant development. Barley plants grown in pots fertilized with N but without P (N), with N and P (NP), or not fertilized (0) were sampled in the early growth phase (day 25), 1 week before and 1 week after spike emergence. Aphids were added 16 days before sampling was carried out. In a separate experiment belowground respiration was measured on N and NP fertilized plant–soil systems with aphid treatments comparable to the first experiment. Aphids reduced numbers of rhizosphere bacteria and fungal feeding nematodes 1 week before spike emergence. Before spike emergence, aphids reduced belowground respiration in NP treatments. These findings strongly indicate that aphids reduced allocation of photoassimilates to roots and deposition of root exudates in the growth phase of the plant. Contrary to this, 1 week after spike emergence numbers of bacteria, fungal feeding nematodes and Protozoa were higher in rhizospheres of plants subjected to aphids probably because aphids enhanced root mortality and root decomposition. Protozoa and bacterial feeding nematodes were stimulated at different experimental conditions with nematodes being the dominant bacterial grazers at N fertilization and Protozoa in the NP treatment before spike emergence.
Starting Page	84
Ending Page	93
Page Count	10
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	141
Issue Number	1
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-07-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aboveground–belowground interactions Bacteria Protozoa Nematodes Root respiration
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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