Evolutionary analysis of the NBS gene family in stone fruit trees and its role in disease resistance

NBS-LRR (nucleotide binding site-leucine-rich repeat) represents the gene family boasting the highest number of disease resistance genes in plants and stands as one of the most extensive gene families in plant genomes.
To investigate NBS-LRR genes in apricot, plum, and peach, hidden Markov models (PF00931, PF01582) sourced from Pfam were employed to identify disease-resistance-associated (DRA) genes in the genome.
The results indicate that 155 DRA genes in apricot, 185 in peach, and 222 in peach, indicating a reduction of DRA genes in the plum genome during evolution.
Both apricot and peach genomes exhibited a greater number of DRA genes compared to plum, and the concentration of DRA genes of Chr1, Chr2, and Chr8 exhibited the higher than other chromosomes.
The DRA genes of apricot, plum, and peach are primarily classified into two types: CNL (CC-NB-LRR) and NL (TIR-NB-LRR), with the CNL type predominating over the NL type.
The analysis of cis-regulatory elements indicates a significant proportion of these elements are related to hormone regulation.
Motif analysis results reveal that the motifs in apricot, plum, and peach are generally consistent.
In summary, the differences in DRA genes among apricot, plum, and peach mainly manifest in their quantity, potentially serving as a primary factor contributing to variations in their environmental resistance.
The findings of this study provide theoretical guidance for the disease-resistant breeding of apricot, plum, and peach.

I International Symposium on Apricot and Plum

F.C. Jiang, L. Yang, J.H. Zhang, M.L. Zhang, W.J. Yu, H.Y. Sun

stone fruit trees, NBS gene family, disease resistance breedin

https://doi.org/10.17660/ActaHortic.2026.1450.43