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Interaction Between Phytophthora nicotianae and Candidatus Liberibacter asiaticus Damage to Citrus Fibrous.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Interaction Between Phytophthora nicotianae and Candidatus Liberibacter asiaticus Damage to Citrus Fibrous./
Author:	Wu, Jian.
Description:	1 online resource (152 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
Contained By:	Dissertations Abstracts International80-02B.
Subject:	Plant sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10906728click for full text (PQDT)
ISBN:	9780438167223

Interaction Between Phytophthora nicotianae and Candidatus Liberibacter asiaticus Damage to Citrus Fibrous.
Wu, Jian.

Interaction Between Phytophthora nicotianae and Candidatus Liberibacter asiaticus Damage to Citrus Fibrous. - 1 online resource (152 pages)

Source: Dissertations Abstracts International, Volume: 80-02, Section: B.

Thesis (Ph.D.)--University of Florida, 2015.

Includes bibliographical references

Huanglongbing (HLB) in Florida is caused by the phloem-limited bacterium, Candidatus Liberibacter asiaticus (Las), which is transmitted by the psyllid vector, Diaphorina citri, or by grafting infected tissue from hosts of the pathogen. Phytophthora nicotianae (P.n.) incites soil-borne diseases of citrus worldwide which reduces water and nutrient uptake and depletes carbohydrate reserves in citrus fibrous roots. Rapid yield loss of sweet orange trees at a low level of HLB canopy symptom expression was observed in Brazil. Meanwhile, unprecedented changes in population of the soil borne pathogen Phytophthora in citrus groves were documented as HLB spread throughout Florida. These findings led to the investigation and discovery that damage to fibrous roots was occurring before or at the same time as canopy symptoms developed and the root damage was caused by Las, and the interaction with soil-borne pathogen P.n. In this study, the interaction between Las and P.n. was investigated.The results showed that 1) Las infection of citrus rootstocks predisposes fibrous roots to P.n. infection by increasing root leakage of exudates that attract zoospores and by disrupting host physiology that mediates the plant response to P.n.; 2) the roots of HLB seedlings were damaged by Las and the combination of Las and P.n., and the root damage caused by co-inoculation was not greater than the damage from each pathogen alone. Further investigation of root and shoot morphological changes caused by Las and P.n. showed that: 1) Las damaged citrus roots by inducing faster root growth and turnover; 2) P.n. damaged fibrous roots by causing rapid root collapse immediately after infection; 3) canopy development was reduced after root damage by both pathogens. To explore disease development from the perspective of root carbohydrate metabolism responses to Las and P.n. infection, sucrose metabolism related gene expression was investigated in two rootstocks (Cleopatra mandarin, susceptible to P.n.; Swingle citrumelo, less susceptible to P.n.). The results showed that sucrose metabolism was more disrupted by Las and P.n. in P.n. susceptible Cleopatra mandarin than in P.n. tolerant Swingle citrumelo.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9780438167223Subjects--Topical Terms:

3173832
Plant sciences.
Subjects--Index Terms:

Candidatus Liberibacter asiaticusIndex Terms--Genre/Form:

542853
Electronic books.

Interaction Between Phytophthora nicotianae and Candidatus Liberibacter asiaticus Damage to Citrus Fibrous.
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500 $a Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
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500 $a Advisor: Graham, James H.
502 $a Thesis (Ph.D.)--University of Florida, 2015.
504 $a Includes bibliographical references
520 $a Huanglongbing (HLB) in Florida is caused by the phloem-limited bacterium, Candidatus Liberibacter asiaticus (Las), which is transmitted by the psyllid vector, Diaphorina citri, or by grafting infected tissue from hosts of the pathogen. Phytophthora nicotianae (P.n.) incites soil-borne diseases of citrus worldwide which reduces water and nutrient uptake and depletes carbohydrate reserves in citrus fibrous roots. Rapid yield loss of sweet orange trees at a low level of HLB canopy symptom expression was observed in Brazil. Meanwhile, unprecedented changes in population of the soil borne pathogen Phytophthora in citrus groves were documented as HLB spread throughout Florida. These findings led to the investigation and discovery that damage to fibrous roots was occurring before or at the same time as canopy symptoms developed and the root damage was caused by Las, and the interaction with soil-borne pathogen P.n. In this study, the interaction between Las and P.n. was investigated.The results showed that 1) Las infection of citrus rootstocks predisposes fibrous roots to P.n. infection by increasing root leakage of exudates that attract zoospores and by disrupting host physiology that mediates the plant response to P.n.; 2) the roots of HLB seedlings were damaged by Las and the combination of Las and P.n., and the root damage caused by co-inoculation was not greater than the damage from each pathogen alone. Further investigation of root and shoot morphological changes caused by Las and P.n. showed that: 1) Las damaged citrus roots by inducing faster root growth and turnover; 2) P.n. damaged fibrous roots by causing rapid root collapse immediately after infection; 3) canopy development was reduced after root damage by both pathogens. To explore disease development from the perspective of root carbohydrate metabolism responses to Las and P.n. infection, sucrose metabolism related gene expression was investigated in two rootstocks (Cleopatra mandarin, susceptible to P.n.; Swingle citrumelo, less susceptible to P.n.). The results showed that sucrose metabolism was more disrupted by Las and P.n. in P.n. susceptible Cleopatra mandarin than in P.n. tolerant Swingle citrumelo.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Plant sciences. $3 3173832
650 4 $a Soil sciences. $3 2122699
650 4 $a Plant pathology. $3 3174872
653 $a Candidatus Liberibacter asiaticus
653 $a Citrus
653 $a Diaphorina citri
653 $a Fibrous root
653 $a Florida
653 $a HLB
653 $a Huanglongbing
653 $a Interaction
653 $a Phytophthora nicotianae
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710 2 $a University of Florida. $3 718949
773 0 $t Dissertations Abstracts International $g 80-02B.
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