Analysis of Endogenous Microbial Community Diversity，Structure and Function of Pepper Different Resistant Phytophthora Blight Cultivars

doi:10.16420/j.issn.0513-353x.2024-0620

Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (2): 322-336.doi: 10.16420/j.issn.0513-353x.2024-0620

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles Next Articles

Analysis of Endogenous Microbial Community Diversity，Structure and Function of Pepper Different Resistant Phytophthora Blight Cultivars

CAI Zeyan¹, ZHANG Mingxing²^,³, ZHOU Chi²^,³, TAO Yu²^,³, YANG Sha¹, LI Xin²^,³^,^*(), LI Xuefeng¹^,²^,^*()

¹ College of Horticulture，Hunan Agricultural University，Changsha 410011，China
² Hunan Vegetable Research Institute，Changsha 410011，China
³ Hunan Engineering Research Center for Endophytic Microbial Resources Mining and Utilization，Changsha 410011，China

Received:2024-09-30 Revised:2024-12-23 Online:2025-02-25 Published:2025-02-23
Contact: LI Xin, LI Xuefeng

Abstract

Abstract:

The total DNA of the roots，stems and leaves samples of peppers were extracted from the susceptible pepper cultivars（Fudijian and Qiemen）and resistant pepper cultivars（CM334 and SJ-0948） respectively，and the v3-v4 region of bacterial 16S rRNA gene and the fungal ITS1 region were sequenced using the Illumina platform. The results showed that there were significant differences in the composition of endophytic microorganisms in different pepper cultivars under natural planting. The diversity and richness index of fungal communities in roots，stems and leaves of susceptible cultivars. were significantly lower than those of resistant pepper cultivars. At the phylum level，the dominant bacterial and fungal phyla in the rhizosphere，root and leaves between two types of resistant peppers were the same，but the relative abundance of fungal Ascomycota phylum in the roots，stems and leaves of susceptible pepper（Fudijian）was much higher than that of resistant cultivars at the genus level，the dominant bacterial genera of the resistant pepper（CM334）were Mycobacterium（36.96%）in the root，and 2013Ark19i（15.21%），Photobacterium（5.50%），and Methylobacterium_Methylorubrum（4.11%）in stem，and Aureimonas （3.02%）in the leaves. Moreover，there were more harmful fungal genera in the endogenous parts of susceptible pepper（Fudijian），such as Fusarium accounting for 9.50% and 4.23% in roots and stems，and Cladosporium accounting for 45.46% and 51.74% in stems and leaves，respectively，which were significantly higher than those of two resistant cultivars. Among the fungal genera，only the relative abundance of Neoascochyta（root，leaf）and Mortierella（root）in resistant pepper cultivars was slightly higher than that of the susceptible pepper cultivars. In addition，the analysis of fungal community trophic types through the Funguild database showed that the relative abundance of the fungal communities in pathotroph in the stems and leaves of susceptible pepper（Fudijian）was higher than that of resistant pepper （SJ-0948 and CM334）.

Key words: pepper, phytophthora blight, resistance characteristic, endophytic microbes, ecological niche

CAI Zeyan, ZHANG Mingxing, ZHOU Chi, TAO Yu, YANG Sha, LI Xin, LI Xuefeng. Analysis of Endogenous Microbial Community Diversity，Structure and Function of Pepper Different Resistant Phytophthora Blight Cultivars[J]. Acta Horticulturae Sinica, 2025, 52(2): 322-336.

Figures/Tables 8

Fig. 1 Endophytic bacterial and fungal rarefaction curves of plant tissues samples from three ecological niches of resistant and susceptible pepper cultivars

Fig. 2 Diversity of endophytic bacterial and fungal communities in three ecological niches of resistant and susceptible pepper cultivars

Fig. 3 PCoA Analysis of bacterial and fungal communities in three ecological niches of resistant and susceptible pepper cultivars

Fig. 4 Relative abundance of bacterial communities at the phylum level in three niches of resistant and susceptible pepper cultivars R1：SJ-0948；R2：CM334；S1：Qiemen；S2：Fudijian. The same below

Fig. 5 Relative abundance of bacterial communities at the genus level in three niches of resistant and susceptible pepper cultivars

Fig. 6 Relative abundance of fungal communities at the phylum level in three niches of resistant and susceptible pepper cultivars

Fig. 7 Relative abundance of fungal communities at the genus level in three niches of resistant and susceptible pepper cultivars

Fig. 8 Phenotypic prediction of bacterial community by Bugbase database（A）and trophic type analysis of fungal community by Funguild database（B）of resistant and susceptible pepper cultivars

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Analysis of Endogenous Microbial Community Diversity，Structure and Function of Pepper Different Resistant Phytophthora Blight Cultivars

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