Genotype-associated core bacteria enhance host resistance against kiwifruit bacterial canker

Min Fu; Yunhe Chen; Yong-Xin Liu; Xiaoxi Chang; Lei Zhang; Xinyi Yang; Li Li; Lixin Zhang

doi:10.1093/hr/uhae236

Genotype-associated core bacteria enhance host resistance against kiwifruit bacterial canker

Hortic Res. 2024 Aug 14;11(11):uhae236. doi: 10.1093/hr/uhae236. eCollection 2024 Nov.

Authors

Min Fu^{1

2}, Yunhe Chen^{1

2}, Yong-Xin Liu³, Xiaoxi Chang^{1

2}, Lei Zhang^{1

2}, Xinyi Yang^{1

2}, Li Li⁴, Lixin Zhang^{1

2}

Affiliations

¹ Anhui Province Key Laboratory of Integrated Pest Management on Crops, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China.
² Key Laboratory of Agri-products Quality and Biosafety, Ministry of Education, Anhui Agricultural University, Hefei 230036, China.
³ Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, Guangdong 518120, China.
⁴ CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, CAS Engineering Laboratory for Kiwifruit Industrial Technology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.

Abstract

Both the phyllosphere and rhizosphere are inhabited by different kinds of microorganisms that are closely related to plant growth and health. However, it is not clear whether disease-resistant cultivars shape the microbiome to facilitate disease resistance. In this study, significant differences were found in the aboveground and belowground bacterial communities of disease-resistant and disease-susceptible cultivars grown in the same kiwifruit orchard. The phyllosphere of the resistant cultivar 'Wanjin' showed greater enrichment of Pseudomonas spp. and Sphingomonas spp. than the susceptible cultivar 'Donghong'. The rhizosphere microbes of 'Wanjin' were less affected by field location, with significantly greater bacterial abundance than those of 'Donghong' and more bacteria with potential biocontrol properties. Pseudomonas syringae pv. actinidiae (Psa) infection significantly affected the microbiome of the phyllosphere of kiwifruit plants, especially that of 'Donghong'. Resistant and susceptible kiwifruit cultivars exhibit distinct beneficial microbial recruitment strategies under Psa challenge. The phyllosphere of 'Donghong' in Jinzhai was enriched with Sphingomonas spp. and Pantoea spp. under Psa infection, while the rhizosphere of 'Wanjin' was enriched with Sphingomonas spp. and Novosphingobium spp. We further identified five key biomarkers within the microbial community associated with Psa infection. Inoculation experiments showed that Lysobacter sp. R34, Stenotrophomonas sp. R31, Pseudomonas sp. R10 and RS54, which were isolated from belowground compartments of 'Wanjin', could positively affect plant performance under Psa challenge. The combination use of Pseudomonas sp. R10 and Stenotrophomonas sp. R31 significantly improve the management of kiwifruit canker. Our findings provided novel insights into soil-microbe-plant interactions and the role of microbes in plant disease resistance and susceptibility.