Abstract
Water quantity and distribution plays a significant role in determining the productivity of crops and the outcome of many host–pathogen interactions in natural plant populations. In the present study, tissue culture plants of the East African highland banana cultivar Mbwazirume were established in a screenhouse to mimic drought conditions in the field and so investigate the effects of water stress on the development of banana xanthomonas wilt ( BXW ) caused by the bacterium Xanthomonas campestris pv. musacearum (Xcm). In the absence of host resistance, all inoculated banana plants succumbed to Xcm infection and symptoms were expressed, on average, 14 days post‐inoculation (dpi). Water stress effects were significant ( P < 0·05) for disease incubation period, and significant ( P < 0·001) for incidence and severity. Data revealed that BXW development is hastened by the combined effect of water stress before and after inoculation compared to when plants are stressed only before inoculation or maintained stress‐free ( SF ). A twofold increase in evaluated disease parameters suggests that both timing of infection and duration of exposure to water stress are important in determining the shortened resident phase of Xcm to multiply and rapidly spread in the vascular tissues of the banana. This study has shown that water‐stressed banana plants are physiologically weak and hence more vulnerable to Xcm infections. This may be of relevance to the effect of future climate change on banana production.
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Claims 6
Claim · model-written summary
All inoculated banana plants developed symptoms and succumbed to Xcm infection at an average of 14 days.
Verbatim
e0“all inoculated banana plants succumbed to Xcm infection and symptoms were expressed, on average, 14 days post‐inoculation (dpi)”
e1“Xanthomonas campestris pv. musacearum (Xcm)”
Claim · model-written summary
Water stress significantly affected disease incubation period.
- Taxon
- bananae1
- Treatment
- Water stresse0
- Outcome
- disease incubation periode0
- Value
- P < 0·05e0
- Comparator
- stress‐freee2
Not reportedInteractorDirection
Verbatim
e0“Water stress effects were significant ( P < 0·05) for disease incubation period”
e1“all inoculated banana plants succumbed to Xcm infection”
e2“maintained stress‐free ( SF )”
Claim · model-written summary
Water stress significantly affected wilt incidence and severity.
- Taxon
- bananae2
- Treatment
- Water stresse1
- Outcome
- incidence and severitye0
- Value
- P < 0·001e0
- Comparator
- stress‐freee3
Not reportedDirection
Verbatim
e0“significant ( P < 0·001) for incidence and severity”
e1“Water stress effects”
e2“all inoculated banana plants succumbed to Xcm infection”
e3“maintained stress‐free ( SF )”
Claim · model-written summary
Stress before and after inoculation hastened BXW development relative to stress only before inoculation or no stress.
Verbatim
e0“BXW development is hastened by the combined effect of water stress before and after inoculation compared to when plants are stressed only before inoculation or maintained stress‐free ( SF )”
t0“banana xanthomonas wilt disease”
Claim · model-written summary
Evaluated disease parameters showed a twofold increase under water stress.
Verbatim
e0“A twofold increase in evaluated disease parameters”
e1“water stress before and after inoculation compared to when plants are stressed only before inoculation or maintained stress‐free ( SF )”
t0“banana xanthomonas wilt disease”
Claim · model-written summary
Water stressed banana plants were physiologically weak and more vulnerable to Xcm infections.
Verbatim
e0“water‐stressed banana plants are physiologically weak and hence more vulnerable to Xcm infections”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.