Caputo, F.; Nicoletti , F.; De Luca Picione , F. and Manici, L. (2015) Rhizospheric changes of fungal and bacterial communities in relation to soil health of multi-generation apple orchards. Biological Control, 88, pp. 8-17.
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The study focused on changes of rhizosphere microbial communities in apple trees in long-term replanted orchards of Central Europe, aiming at developing cropping practices to mitigate replant problems. It started from the evidence of a previous study which showed that a slight modification
of root-colonizing fungal communities was responsible for a great increase of plant growth in soil samples which had previously been subjected to a gamma-irradiation cycle (25 kGy for 8 h), as compared to that observed in the corresponding untreated native soils.
The study was performed on rhizospheric soil from nine multi-generation apple orchards after a plant growth assay with M9 rootstock plantlets. PCR-DGGE analysis of soil DNA was performed to evaluate fungal and bacterial communities in fallow and replanted soils, as well as corresponding
gamma-irradiated samples. Findings showed that rhizospheric fungal and bacterial communities within apple orchards did not differ according to their position within the orchard; while, they showed a shift in the gamma-irradiated soils. Pseudomonas fluorescens, Pseudomonas tolasii, Pseudomonas spp. and Novosphingobium spp. were the bacteria which were mainly attributed to this change. A shifting in composition of Fusarium communities toward F. oxysporum and F. equiseti resulted the most linked to the changes at rhizosphere level after re-colonization; to the contrary, F. venenatum and F. venaceum, Truncatella sp. and Gibellulopsis sp., only occurred in native soils. Findings of this study suggest that disturbance events such as a gamma-irradiation can
modify microbial communities in long-term apple orchards thus allowing a soil re-colonization suitable to increase soil suppressiveness.
|EPrint Type:||Journal paper|
|Keywords:||DGGE; Disturbance; Fusarium spp.; permanenent crops; Pseudomonas spp.; replant problems; soil suppressiveness.|
|Subjects:|| Crop husbandry > Production systems > Fruit and berries|
Crop husbandry > Crop health, quality, protection
|Research affiliation:|| European Union > CORE Organic II > BIO-INCROP|
European Union > CORE Organic II
|Deposited By:||Manici, dr Luisa M.|
|Deposited On:||26 May 2015 15:59|
|Last Modified:||29 May 2015 09:09|
|Refereed:||Peer-reviewed and accepted|
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