Tolerance of the Trifoliate Citrus Hybrid US-897 (Citrus reticulata Blanco × Poncirus trifoliata L. Raf.) to Huanglongbing
By Ute Albrecht, K. Bowman. 2011
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Huanglongbing (HLB) is a destructive disease of citrus in most citrus-producing countries worldwide. The disease, presumably caused by phloem-limited bacteria of the genus Candidatus Liberibacter, affects all known citrus species and citrus relatives with little known resistance. Typical disease symptoms are the production of abnormal- looking fruit and chlorosis or blotchy mottle of the leaves followed at advanced stages by tree decline and death. Trifoliate orange (P. trifoliata L. Raf.) and some of its hybrids reportedly lack distinct disease symptoms despite infection with the pathogen. US-897 is a hybrid of trifoliate orange and 'Cleopatra' mandarin (C. reticulata Blanco), the latter being highly susceptible to HLB. This study investigated whether field-grown, naturally infected trees and greenhouse-grown, graft-inoculated seedlings of this genotype display tolerance or resistance to HLB. It was shown that naturally infected US-897 trees ex- hibited no distinct disease symptoms commonly associated with HLB, except for the occurrence of few mottled leaves in a small percentage of trees. Analysis of fruit and seed from infected trees did not detect any growth reduction or otherwise negative impact on development. Graft-inoculated US-897 seedlings became polymerase chain reaction (PCR)-positive for the pathogen but exhibited a superior performance compared with 'Cleopatra' mandarin seedlings, which displayed severe disease symptoms soon after inoculation. Despite infection, most US-897 seedlings did not develop leaf symptoms typical for HLB. Foliar symptoms observed in a small number of plants at later stages of the disease were faint and difficult to discern. Contrary to 'Cleopatra' seedlings, growth in stem diameter was only moderately reduced or unaffected in infected US-897 seedlings. The superior performance of US-897 plants in greenhouse and field locations suggest tolerance of this genotype to Ca. L. asiaticus.
Subfields: Horticulture, Plant Science
View Paper: https://www.semanticscholar.org/paper/07832fb8113ecd73d198e8842f1748eb2b95119b
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Citations in the corpus
- Tolerance of trifoliate citrus rootstock hybrids to Candidatus Liberibacter asiaticus (2012, background): “Susceptibility of Cleopatra nd tolerance of US-897 to Las was detected in an earlier study onducted in our laboratory (Albrecht and Bowman, 2011).”
- Performance of ‘Valencia’ orange (Citrus sinensis [L.] Osbeck) on 17 rootstocks in a trial severely affected by huanglongbing (2016, background): “…Las infection without grafting and under greenhouse conditions have proven valuable for understanding of Las infection and HLB disease development (Albrecht and Bowman, 2011,2012), but they appear insufficient to make good predictions about ultimate field performance of grafted trees infected…”