Details
| Original language | English |
|---|---|
| Pages (from-to) | 369-376 |
| Number of pages | 8 |
| Journal | Acta Horticulturae |
| Volume | 1366 |
| Publication status | Published - Apr 2023 |
Abstract
Worldwide, tree nurseries and apple orchards are facing the problem of apple replant disease (ARD) which results in growth depression and fruit yield and quality reduction. The etiology of this complex soil-borne disease which persists at the affected sites for decades is still not fully understood, but can best be described as a dysbiotic state and a negative plant-soil feedback. Although biofumigation with Brassica seed meal, catch cropping and breeding of tolerant rootstocks have been suggested as countermeasures, sustainable and effective management options still need to be developed or optimized. This is the main objective of the consortium BonaRes-ORDIAmur. Important insights were gained from transcriptomic comparisons of apple rootstocks growing in ARD-affected and disinfected soils: genes involved in phytoalexin biosynthesis were strongly upregulated in roots in ARD soils as were the contents of the phytoalexins. Their role in the disease awaits clarification: on the one hand they can support the plant by acting against the ARD-causing organisms, but on the other hand these toxic metabolites could be harmful to the root cells in which they accumulate. Therefore, studies on their exudation are in progress. Regarding ARD-associated organisms, data from ORDIAmur-scientists indicate the following: (i) Members of the Nectriaceae were found enriched in the rhizosphere and isolated from symptomatic root segments and were proven pathogenic. (ii) The relative abundance of Streptomyces was significantly increased in rhizospheres and roots from ARD soils. (iii) A contribution of plant parasitic nematodes to ARD could not be confirmed, but instead, populations of free-living nematodes and their associated microbiome differed between ARD and control soils. (iv) An increase in microbial genes related to stress sensing in the rhizosphere of ARD-affected soils as well as a lower abundance of genes coding for enzymes involved in the degradation of aromatic compounds was observed in the first metagenomic study.
Keywords
- dysbiosis, fruit orchards, Malus domestica, pathogen complex, phytoalexins, soil fatigue, tree nursery
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Horticulture
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In: Acta Horticulturae, Vol. 1366, 04.2023, p. 369-376.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Apple replant disease
T2 - new insights into an old problem
AU - Winkelmann, T.
AU - Mahnkopp-Dirks, F.
N1 - Funding Information: The authors thank all ORDIAmur partners and the Federal Ministry of Research and Education (BMBF) for funding the project BonaRes-ORDIAmur (31B0025 and 031B0512).
PY - 2023/4
Y1 - 2023/4
N2 - Worldwide, tree nurseries and apple orchards are facing the problem of apple replant disease (ARD) which results in growth depression and fruit yield and quality reduction. The etiology of this complex soil-borne disease which persists at the affected sites for decades is still not fully understood, but can best be described as a dysbiotic state and a negative plant-soil feedback. Although biofumigation with Brassica seed meal, catch cropping and breeding of tolerant rootstocks have been suggested as countermeasures, sustainable and effective management options still need to be developed or optimized. This is the main objective of the consortium BonaRes-ORDIAmur. Important insights were gained from transcriptomic comparisons of apple rootstocks growing in ARD-affected and disinfected soils: genes involved in phytoalexin biosynthesis were strongly upregulated in roots in ARD soils as were the contents of the phytoalexins. Their role in the disease awaits clarification: on the one hand they can support the plant by acting against the ARD-causing organisms, but on the other hand these toxic metabolites could be harmful to the root cells in which they accumulate. Therefore, studies on their exudation are in progress. Regarding ARD-associated organisms, data from ORDIAmur-scientists indicate the following: (i) Members of the Nectriaceae were found enriched in the rhizosphere and isolated from symptomatic root segments and were proven pathogenic. (ii) The relative abundance of Streptomyces was significantly increased in rhizospheres and roots from ARD soils. (iii) A contribution of plant parasitic nematodes to ARD could not be confirmed, but instead, populations of free-living nematodes and their associated microbiome differed between ARD and control soils. (iv) An increase in microbial genes related to stress sensing in the rhizosphere of ARD-affected soils as well as a lower abundance of genes coding for enzymes involved in the degradation of aromatic compounds was observed in the first metagenomic study.
AB - Worldwide, tree nurseries and apple orchards are facing the problem of apple replant disease (ARD) which results in growth depression and fruit yield and quality reduction. The etiology of this complex soil-borne disease which persists at the affected sites for decades is still not fully understood, but can best be described as a dysbiotic state and a negative plant-soil feedback. Although biofumigation with Brassica seed meal, catch cropping and breeding of tolerant rootstocks have been suggested as countermeasures, sustainable and effective management options still need to be developed or optimized. This is the main objective of the consortium BonaRes-ORDIAmur. Important insights were gained from transcriptomic comparisons of apple rootstocks growing in ARD-affected and disinfected soils: genes involved in phytoalexin biosynthesis were strongly upregulated in roots in ARD soils as were the contents of the phytoalexins. Their role in the disease awaits clarification: on the one hand they can support the plant by acting against the ARD-causing organisms, but on the other hand these toxic metabolites could be harmful to the root cells in which they accumulate. Therefore, studies on their exudation are in progress. Regarding ARD-associated organisms, data from ORDIAmur-scientists indicate the following: (i) Members of the Nectriaceae were found enriched in the rhizosphere and isolated from symptomatic root segments and were proven pathogenic. (ii) The relative abundance of Streptomyces was significantly increased in rhizospheres and roots from ARD soils. (iii) A contribution of plant parasitic nematodes to ARD could not be confirmed, but instead, populations of free-living nematodes and their associated microbiome differed between ARD and control soils. (iv) An increase in microbial genes related to stress sensing in the rhizosphere of ARD-affected soils as well as a lower abundance of genes coding for enzymes involved in the degradation of aromatic compounds was observed in the first metagenomic study.
KW - dysbiosis
KW - fruit orchards
KW - Malus domestica
KW - pathogen complex
KW - phytoalexins
KW - soil fatigue
KW - tree nursery
UR - http://www.scopus.com/inward/record.url?scp=85161613665&partnerID=8YFLogxK
U2 - 10.17660/ActaHortic.2023.1366.45
DO - 10.17660/ActaHortic.2023.1366.45
M3 - Article
AN - SCOPUS:85161613665
VL - 1366
SP - 369
EP - 376
JO - Acta Horticulturae
JF - Acta Horticulturae
SN - 0567-7572
ER -