Anatomical distribution of abnormally high levels of starch in HLB-affected Valencia orange trees

Etxeberria, Ed; González, Pedro; Achor, Diann; Albrigo, Gene

doi:10.1016/j.pmpp.2009.09.004

Cited by 209 publications

(235 citation statements)

References 16 publications

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“…Introduction of phytopathogens and nonnative bacteria have been shown to change the amount and composition of organic acids, sugars and other essential nutrients in the root exudates (Phillips et al, 2004;Kamilova et al, 2006;Neumann and Römheld, 2007). Our model disease, HLB is known to cause carbohydrate partitioning imbalances throughout the tree (Etxeberria et al, 2009). HLB-infected trees accumulate a much higher level of starch in the leaves, whereas the roots are depleted of any starch.…”

Section: Discussionmentioning

confidence: 99%

“…HLB-infected trees accumulate a much higher level of starch in the leaves, whereas the roots are depleted of any starch. Blockage of the photoassimilate transport causes the roots to consume the stored starch to sustain their metabolic activities resulting in root death and eventual tree decline (Etxeberria et al, 2009;Kim et al, 2009). We assume that alteration in plant physiology leading to quantitative and qualitative changes in partitioning the photoassimilates is primarily responsible for the shift in microbial diversity in the rhizosphere of HLB-diseased and healthy trees.…”

Section: Discussionmentioning

confidence: 99%

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Huanglongbing alters the structure and functional diversity of microbial communities associated with citrus rhizosphere

et al. 2011

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The diversity and stability of bacterial communities present in the rhizosphere heavily influence soil and plant quality and ecosystem sustainability. The goal of this study is to understand how ‘Candidatus Liberibacter asiaticus’ (known to cause Huanglongbing, HLB) influences the structure and functional potential of microbial communities associated with the citrus rhizosphere. Clone library sequencing and taxon/group-specific quantitative real-time PCR results showed that ‘Ca. L. asiaticus’ infection restructured the native microbial community associated with citrus rhizosphere. Within the bacterial community, phylum Proteobacteria with various genera typically known as successful rhizosphere colonizers were significantly greater in clone libraries from healthy samples, whereas phylum Acidobacteria, Actinobacteria and Firmicutes, typically more dominant in the bulk soil were higher in ‘Ca. L. asiaticus’-infected samples. A comprehensive functional microarray GeoChip 3.0 was used to determine the effects of ‘Ca. L. asiaticus’ infection on the functional diversity of rhizosphere microbial communities. GeoChip analysis showed that HLB disease has significant effects on various functional guilds of bacteria. Many genes involved in key ecological processes such as nitrogen cycling, carbon fixation, phosphorus utilization, metal homeostasis and resistance were significantly greater in healthy than in the ‘Ca. L. asiaticus’-infected citrus rhizosphere. Our results showed that the microbial community of the ‘Ca. L. asiaticus’-infected citrus rhizosphere has shifted away from using more easily degraded sources of carbon to the more recalcitrant forms. Overall, our study provides evidence that the change in plant physiology mediated by ‘Ca. L. asiaticus’ infection could elicit shifts in the composition and functional potential of rhizosphere microbial communities. In the long term, these fluctuations might have important implications for the productivity and sustainability of citrus-producing agro-ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Huanglongbing alters the structure and functional diversity of microbial communities associated with citrus rhizosphere

et al. 2011

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“…Hussain and Nath (1927) also described the symptoms of HLB that lookalike symptoms reported today. Due to vascular blockage, starch accumulation occurs in HLB symptomatic leaf tissue as described by Etxeberria et al (2009). Upregulation of starch synthesizing genes incorporating ADP-glucose pyrophosphorylase, granule bound starch synthase and starch debranching enzyme result in starch accumulation in HLB infected leaves (Kim et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Detection of ‘Candidatus Liberibacter Asiaticus’ the Causal Organism of Huanglongbing, in Mandarin Group of Citrus

Aslam¹,

Khan²,

Rahman³

et al. 2017

IJAB

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Huanglongbing (HLB) is a fatal disease of citrus. We report the detection of 'Candidatus Liberibacter asiaticus' the causal organism of huanglongbing, in mandarin group of citrus. Four genotypes of citrus belonging to mandarin group including: Citrus sunki, Kinnow, Parson's Special and Sun Chu Sha were studied for the detection of HLB bacterium. Taqman based real time qPCR was performed for the detection of Candidatus Liberibacter asiaticus in citrus host. Highest mean cycle threshold value of 25.06 was obtained for Kinnow mandarin while 24.30 for Parson's Special, 23.95 for Citrus Sunki and 22.0 for Sun Chu Sha. These results may be helpful in the development of management plans for HLB control in Pakistan as well as round the world.

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“…Como respuesta a la infección de plantas de cítricos con HLB, el metabolismo de carbohidratos en el que interviene la α amilasa, es alterado (Albrecht y Bowman, 2008; Etxeberria et al, 2009).…”

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“…In response to the infection of citrus plants with HLB, carbohydrate metabolism involving α-amylase is altered (Albrecht and Bowman, 2008;Etxeberria et al, 2009).…”

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confidence: 99%

Comparación de enzimas y compuesto fenólicos, en tres especies de cítricos infectadas por Candidatus Liberibacter asiaticus

Torres

Olivas

Fuentes

et al. 2017

RMF

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Anatomical distribution of abnormally high levels of starch in HLB-affected Valencia orange trees

Cited by 209 publications

References 16 publications

Huanglongbing alters the structure and functional diversity of microbial communities associated with citrus rhizosphere

Huanglongbing alters the structure and functional diversity of microbial communities associated with citrus rhizosphere

Detection of ‘Candidatus Liberibacter Asiaticus’ the Causal Organism of Huanglongbing, in Mandarin Group of Citrus

Comparación de enzimas y compuesto fenólicos, en tres especies de cítricos infectadas por Candidatus Liberibacter asiaticus

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