Multiplication and distribution of Candidatus Liberibacter asiaticus, the bacterium causing citrus huanglongbing,in the Asian citrus psyllid (Diaphorina citri Kuwayama)
Date Issued
2005
Date
2005
Author(s)
Chiang-Lin, Hui
DOI
zh-TW
Abstract
Citrus huanglongbing (HLB) is a serious citrus disease in Asia and Africa. It is caused by the infection of Candidatus Liberibacter asiaticus (Las), a fastidious bacterium that resides in the sieve tube of host plants. The pathogen is transmitted persistently by the Asian citrus psyllid, Diaphorina citri in Asia. In order to figure out the whole process of Las inside psyllids, and its ill effect on the psyllids. The transmission electron microscopy (TEM) was employes. The psyllids were able to transmit Las to their host plants 7 days after acquisition from the Las-infected plant. Las multiplied first in the midgut epithelial cells of psyllid, and then penetrated through the basal lamina and entered into the hemocoel. Las multiplied again in the hemocoel and then invaded other host tissues, including hemocytes, nervous tissue, fat body, trachea, and muscle. Eventually, Las invaded the salivary gland and the Las-infected psyllids were enabled to transmit Las to other host plants. Symptoms of serious pathogenesis occurred in the muscle tissue. The number of mitochondria in the Las-infected muscle cells was reduced and, the myofilaments and sarcolemma were disrupted. The longevity of Las-infected psyllids was significantly shortened and its fecundity reduced.
Subjects
柑橘黃龍病菌
柑橘木蝨
Candidatus Liberibacter asiaticus
Diaphorina citri
Type
thesis
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