Physiologic, Anatomic, and Gene Expression Changes in Citrus sunki, Poncirus trifoliata, and Their Hybrids After ‘Candidatus Liberibacter asiaticus’ Infection

• DOI: 10.1094/phyto-02-16-0077-r
• Publication Date: 2017-01-09T20:34:24Z
• Authors: Leonardo Pires Boava; Mariângela Cristo...; Marcos Antonio Ma...
• Keywords: 0301 basic medicine; Citrus; Genotype; Chimera; Starch; Phloem; Up-Regulation; Plant Leaves; 03 medical and health sciences; Gene Expression Regulation, Plant; Rhizobiaceae; Poncirus; Disease Susceptibility; Glucans; Disease Resistance; Plant Diseases

Huanglongbing (HLB) is a destructive disease of citrus caused by phloem-limited bacteria, namely 'Candidatus Liberibacter asiaticus' (Las), africanus', and americanus'. Although there are no known HLB-resistant species, studies have reported Poncirus trifoliata as being more tolerant. Assuming that callose deposition in the phloem infected plants can inhibit translocation photosynthetic products cause starch accumulation, we compared petioles accumulation leaves three genotypes (Citrus sinensis, C. sunki, P. trifoliata) 15 hybrids (C. sunki × trifoliata). Compared with mock-inoculated plants, higher bacterial counts greater were found 10 hybrid plants. Lower titer fewer metabolic changes due to Las infection observed two Las-positive while Las-negative. Callose was linked correlated genes involved functionality up-regulation biosynthesis repression those related breakdown. expression resistant tolerant partially explain absence distinct symptoms associated usually HLB-susceptible genotypes.