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Pathogen infection drives patterns of nutrient resorption in citrus plants.

Cao J, Cheng C, Yang J, Wang Q - Sci Rep (2015)

Bottom Line: We investigated the effects of 'Ca.P resorption efficiency substantially decreased in infected C. reticulata plants relative to the healthy plants in summer, which may account for the marked decrease in the average fruit yield.However, for C. maxima plants, HLB had no significant effects on N:P ratio in live leaves and resorption efficiency as well as on fruit yield.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.

ABSTRACT
Nutrient resorption processes in the plants infected by pathogen remain poorly understood. Huanglongbing (HLB) is a destructive disease of citrus. HLB-pathogen 'Candidatus Liberibacter asiaticus' grows specifically in the phloem of hosts and may cause problems in the plant vascular system after infection. Therefore, it brings a great concern about the phloem nutrient transport and nutrient intra-cycling in HLB-affected plants. We investigated the effects of 'Ca. L. asiaticus' infection on nitrogen (N) and phosphorus (P) concentrations and resorption in different citrus species (i.e. Citrus reticulata, Citrus limon and Citrus maxima). HLB-pathogen infection had distinctive impacts on nutrient resorption in different species. P resorption efficiency substantially decreased in infected C. reticulata plants relative to the healthy plants in summer, which may account for the marked decrease in the average fruit yield. P resorption was more efficient in infected C. limon plants than in the healthy plants. However, for C. maxima plants, HLB had no significant effects on N:P ratio in live leaves and resorption efficiency as well as on fruit yield. Keeping efficient internal nutrient cycling can be a strategy of citrus species being tolerant to HLB.

No MeSH data available.


Related in: MedlinePlus

P (a,b) and N (c,d) resorption efficiencies of different citrus species.Values are mean±Se, n = 5. *, ** and *** above bars indicate significant differences at P < 0.05, 0.01 and 0.001, respectively, derived from the results of paired t-tests.
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f3: P (a,b) and N (c,d) resorption efficiencies of different citrus species.Values are mean±Se, n = 5. *, ** and *** above bars indicate significant differences at P < 0.05, 0.01 and 0.001, respectively, derived from the results of paired t-tests.

Mentions: P resorption efficiency was significantly greater than N resorption efficiency across the three citrus species, regardless of ‘Ca. L. asiaticus’ infection (matched pairs analysis P < 0.0001; Fig. 3). The HLB-pathogen infection had marked impacts on P resorption efficiencies among different citrus species (P = 0.001 for HLB effects, P < 0.0001 for species effects, P < 0.0001 for their interactive effects; Table 2). P resorption efficiency recorded an overall increase in ‘Ca. L. asiaticus’-infected citrus plants compared with healthy plants (P < 0.001). Phosphorus resorption was more efficient in infected C. limon plants than in the healthy plants (P < 0.001; Fig. 3a,b). The P resorption efficiency in C. maxima plants showed no significant changes in response to ‘Ca. L. asiaticus’ infection in summer and autumn. The fruit production of C. maxima plants was not affected by HLB (209.7 kg/tree in the healthy trees and 202.8 kg/tree in the infected trees). However, there were distinct seasonal patterns in P resorption efficiency in infected C. reticulata plants. Compared with the healthy plants, P resorption efficiency in HLB-positive C. reticulata plants substantially decreased in June, while it increased in October (P < 0.001; Fig. 3a,b). N resorption efficiency was also significantly affected by the HLB-pathogen infection (P < 0.0001; Table 2) and presented similar patterns to P resorption efficiency (Fig. 3c,d). Especially, N in infected C. reticulata plants showed accumulation in the senesced leaves in June. The average C. reticulata fruit yield dropped from 21.7 kg/tree in the healthy plants to 4.5 kg/tree in the infected plants.


Pathogen infection drives patterns of nutrient resorption in citrus plants.

Cao J, Cheng C, Yang J, Wang Q - Sci Rep (2015)

P (a,b) and N (c,d) resorption efficiencies of different citrus species.Values are mean±Se, n = 5. *, ** and *** above bars indicate significant differences at P < 0.05, 0.01 and 0.001, respectively, derived from the results of paired t-tests.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588592&req=5

f3: P (a,b) and N (c,d) resorption efficiencies of different citrus species.Values are mean±Se, n = 5. *, ** and *** above bars indicate significant differences at P < 0.05, 0.01 and 0.001, respectively, derived from the results of paired t-tests.
Mentions: P resorption efficiency was significantly greater than N resorption efficiency across the three citrus species, regardless of ‘Ca. L. asiaticus’ infection (matched pairs analysis P < 0.0001; Fig. 3). The HLB-pathogen infection had marked impacts on P resorption efficiencies among different citrus species (P = 0.001 for HLB effects, P < 0.0001 for species effects, P < 0.0001 for their interactive effects; Table 2). P resorption efficiency recorded an overall increase in ‘Ca. L. asiaticus’-infected citrus plants compared with healthy plants (P < 0.001). Phosphorus resorption was more efficient in infected C. limon plants than in the healthy plants (P < 0.001; Fig. 3a,b). The P resorption efficiency in C. maxima plants showed no significant changes in response to ‘Ca. L. asiaticus’ infection in summer and autumn. The fruit production of C. maxima plants was not affected by HLB (209.7 kg/tree in the healthy trees and 202.8 kg/tree in the infected trees). However, there were distinct seasonal patterns in P resorption efficiency in infected C. reticulata plants. Compared with the healthy plants, P resorption efficiency in HLB-positive C. reticulata plants substantially decreased in June, while it increased in October (P < 0.001; Fig. 3a,b). N resorption efficiency was also significantly affected by the HLB-pathogen infection (P < 0.0001; Table 2) and presented similar patterns to P resorption efficiency (Fig. 3c,d). Especially, N in infected C. reticulata plants showed accumulation in the senesced leaves in June. The average C. reticulata fruit yield dropped from 21.7 kg/tree in the healthy plants to 4.5 kg/tree in the infected plants.

Bottom Line: We investigated the effects of 'Ca.P resorption efficiency substantially decreased in infected C. reticulata plants relative to the healthy plants in summer, which may account for the marked decrease in the average fruit yield.However, for C. maxima plants, HLB had no significant effects on N:P ratio in live leaves and resorption efficiency as well as on fruit yield.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.

ABSTRACT
Nutrient resorption processes in the plants infected by pathogen remain poorly understood. Huanglongbing (HLB) is a destructive disease of citrus. HLB-pathogen 'Candidatus Liberibacter asiaticus' grows specifically in the phloem of hosts and may cause problems in the plant vascular system after infection. Therefore, it brings a great concern about the phloem nutrient transport and nutrient intra-cycling in HLB-affected plants. We investigated the effects of 'Ca. L. asiaticus' infection on nitrogen (N) and phosphorus (P) concentrations and resorption in different citrus species (i.e. Citrus reticulata, Citrus limon and Citrus maxima). HLB-pathogen infection had distinctive impacts on nutrient resorption in different species. P resorption efficiency substantially decreased in infected C. reticulata plants relative to the healthy plants in summer, which may account for the marked decrease in the average fruit yield. P resorption was more efficient in infected C. limon plants than in the healthy plants. However, for C. maxima plants, HLB had no significant effects on N:P ratio in live leaves and resorption efficiency as well as on fruit yield. Keeping efficient internal nutrient cycling can be a strategy of citrus species being tolerant to HLB.

No MeSH data available.


Related in: MedlinePlus