Developing of HLB resistance in Citrus rootstocks through antimicrobial peptide expression

REYES; CONTI GABRIELA; GOCHEZ A; GOMEZ C; GARDELLA V; ALMASIA, NATALIA INÉS; VANESA NAHIRÑAK,; CECILIA VAZQUEZ ROVERE; KOBAYASHI K; GARCÍA M; ESTEBAN HOPP; CANTEROS B

Congreso; IV congreso argentino de Biotecnología de cítricos; 2018

The disease Huanglongbing represents the greatest threst to citus crop and has resulted in losses of up to 100%. In Argentina, the first diseased plants were detected in Misiones province in 2012 and currently exceed 200 positive cases including several provinces. The causative agent is a bacterium of the genus Candidatus Liberibacter, wich is transmittes by an insect vector present in citrus regions, the psylid Diaphorina citri. Among control strategies, genetic engineering techniques appear as very promising, since traditional breeding and alternative management of the Psyllid through application of insecticides has shown to be difficult expensive and inefficient. Citrus plants are mainly propagates by grafting commercial varieties onto rootstocks. The present work shows the generation of transgenic plants of the rootstock Citrange troyer with a construct for the expression of the antimicrobial peptide snakin/GASA that has previously demonstrated to exert direct antimicrobial effects in potato plants. After regeneration, rustication and molecular characterization, the generated transgenic lines will be challenged against bacterial pathogens such as Pseudomonas syringae, Xhanthomonas sp and Candidatus Liberibacter. Commercial non-GMO sweet orange scions will be grafted onto resistant/tolerant trangenic lines for field-testing to determine if the improved tolerance can also be transmitted to the scion.