HLB induce changes in the tree physiology of citron ( L. var. Swingle).

Unlabelled: Huanglongbing (HLB) is a highly destructive disease that decreases the yield and quality of L. var. Swingle ( var. ) and poses a great threat to the development of the global citrus industry. To explore the influence of HLB infection on var, levels of photosynthetic pigments, malondialdehyde (MDA), and carbohydrates, as well as antioxidant enzyme activities, were measured. The results show that HLB infection decreased photosynthetic pigment content, increased MDA content and antioxidant enzyme activities, and caused various changes in carbohydrate levels in stem, fruit, and leaf tissues. Transcriptomic analysis of var was also used to identify key genes related to the carbohydrate metabolic synthesis pathway in var. The var. , var. var. var. var. and were successfully cloned and identified, and differential expression analysis showed that HLB infection significantly upregulated these genes in stems and leaves. In conclusion, HLB infection causes cellular damage, a reduction in photosynthetic capacity, decreased pathogen resistance, and severe disorders in carbohydrate metabolism in var. .

Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-022-01129-z.