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פותח על ידי קלירמאש פתרונות בע"מ -
Stress avoidance: vertical movement of entomopathogenic nematodes in response to soil moisture gradient
Year:
2015
Source of publication :
Phytoparasitica
Authors :
גלזר, איתמר
;
.
סלמה, ליאורה
;
.
Volume :
43
Co-Authors:
Salame, L., Department of Entomology and Nematology, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, Israel
Glazer, I., Department of Entomology and Nematology, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, Israel
Facilitators :
From page:
647
To page:
655
(
Total pages:
9
)
Abstract:
Survival of entomopathogenic nematodes (EPNs) in soils is attributed to their entering a dormant state—anhydrobiosis—as soil moisture decreases, but EPNs with poor desiccation tolerance and low anhydrobiotic capabilities may practice desiccation avoidance. We compared the effect of soil moisture gradient on downward movement of the highly desiccation-tolerant Steinernema carpocapsae and the poorly desiccation-tolerant Heterorhabditis bacteriophora. Infective juveniles (IJs) were applied to the surface of moist (11–13% w/w moisture) sandy soil in buckets. Nematode distribution was monitored at different depths 3, 14 and 28 days after application. In uncovered buckets, soil moisture decreased to 1% in the upper 5-cm layer after 28 days. H. bacteriophora IJs abandoned the upper soil layers as dryness intensified with >80% found in the bottom (20–25 cm) layer. In contrast, >70% S. carpocapsae IJs remained in the upper layer. In covered buckets, with 10% moisture throughout the experiment, heterorhabditid IJs were equally distributed between the 10–15 cm and 20–25 cm layers; only 7% remained in the upper layer. Again, >70% S. carpocapsae IJs remained in the upper layer throughout. Soil type influenced H. bacteriophora IJs' downward migration. In sandy and sandy loam soils, with rapid evaporation, >80% IJs were in the bottom layer 14 and 28 days after application. In the loam soil, with higher moisture retention, >75% IJs remained in the 10–15 cm layer and <20% migrated to the bottom. Results provide initial evidence of a possible stress-avoidance strategy in H. bacteriophora under natural conditions. © 2015, Springer Science+Business Media Dordrecht.
Note:
Related Files :
Desiccation tolerance
downward movement
Heterorhabditis bacteriophora
soil moisture gradient
Steinernema carpocapsae
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/s12600-015-0488-8
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:

Itamar's own PDF.

ID:
28045
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:36
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Scientific Publication
Stress avoidance: vertical movement of entomopathogenic nematodes in response to soil moisture gradient
43
Salame, L., Department of Entomology and Nematology, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, Israel
Glazer, I., Department of Entomology and Nematology, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, Israel
Stress avoidance: vertical movement of entomopathogenic nematodes in response to soil moisture gradient
Survival of entomopathogenic nematodes (EPNs) in soils is attributed to their entering a dormant state—anhydrobiosis—as soil moisture decreases, but EPNs with poor desiccation tolerance and low anhydrobiotic capabilities may practice desiccation avoidance. We compared the effect of soil moisture gradient on downward movement of the highly desiccation-tolerant Steinernema carpocapsae and the poorly desiccation-tolerant Heterorhabditis bacteriophora. Infective juveniles (IJs) were applied to the surface of moist (11–13% w/w moisture) sandy soil in buckets. Nematode distribution was monitored at different depths 3, 14 and 28 days after application. In uncovered buckets, soil moisture decreased to 1% in the upper 5-cm layer after 28 days. H. bacteriophora IJs abandoned the upper soil layers as dryness intensified with >80% found in the bottom (20–25 cm) layer. In contrast, >70% S. carpocapsae IJs remained in the upper layer. In covered buckets, with 10% moisture throughout the experiment, heterorhabditid IJs were equally distributed between the 10–15 cm and 20–25 cm layers; only 7% remained in the upper layer. Again, >70% S. carpocapsae IJs remained in the upper layer throughout. Soil type influenced H. bacteriophora IJs' downward migration. In sandy and sandy loam soils, with rapid evaporation, >80% IJs were in the bottom layer 14 and 28 days after application. In the loam soil, with higher moisture retention, >75% IJs remained in the 10–15 cm layer and <20% migrated to the bottom. Results provide initial evidence of a possible stress-avoidance strategy in H. bacteriophora under natural conditions. © 2015, Springer Science+Business Media Dordrecht.
Scientific Publication
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