Abstract
Bean common mosaic virus–blackeye cowpea strain (BCMV-BlC) and cowpea aphid-borne mosaic virus (CABMV) belonging to the genus potyvirus are cosmopolitan and economically important pathogens of cowpea. This study analysed the linear relationship between yield and some yield related characters (numbers of pods per plant, number of seeds per pod, pod growth rate, etc) in 15 cowpea lines infected with BCMV-BlC and CABMV. Isolates of the viruses were mechanically inoculated into the cowpea lines; as a result of the effect of viruses, the cowpea lines were categorized as highly resistant, tolerant, susceptible and highly susceptible. The linear associations between yield and other characters in resistant and tolerant varieties were similar to the associations in susceptible and highly susceptible varieties. The similarity in the correlation coefficient regardless of the susceptibility status was caused by systemic spread of infections in susceptible cowpea varieties such that organs were uniformly reduced while there was minimal reduction in tolerant and no reduction in highly resistant varieties. Pod growth rate correlated (p > 0.05) positively and highly with the yield in seven susceptible varieties and in 5 of the 8 resistant varieties infected by CABMV and BCMV-BlC and the relationship between disease severity and yield showed that as disease severity increased cowpea yield decreased. BCMV-BlC reduced the seed yield between 62 to 87% and CABMV between 54 to 87% in some cowpea varieties. Keywords: cowpea, potyvirus, virus infection, correlation, plant disease Global Journal of Pure and Applied Sciences Vol. 12(1) 2006: 11-17
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Claims 7
Claim · model-written summary
Inoculated cowpea lines were categorized across resistance and susceptibility classes.
- Taxon
- cowpea
Vigna unguiculatae0 - Outcome
- categorized as highly resistant, tolerant, susceptible and highly susceptiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cowpea lines were categorized as highly resistant, tolerant, susceptible and highly susceptible.”
Claim · model-written summary
Yield character associations were similar across resistant or tolerant and susceptible cowpea varieties.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- resistant and tolerant varietiese0
- Outcome
- linear associations between yield and other characterse0
- Direction
- similare0
- Comparator
- susceptible and highly susceptible varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The linear associations between yield and other characters in resistant and tolerant varieties were similar to the associations in susceptible and highly susceptible varieties.”
t0“cowpea varieties infected with two cowpea potyviruses”
Claim · model-written summary
Systemic infection in susceptible cowpea varieties uniformly reduced organs, with minimal reduction in tolerant and none in highly resistant varieties.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- organs were uniformly reducede0
- Qualifier
- systemic spread of infectionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“systemic spread of infections in susceptible cowpea varieties such that organs were uniformly reduced while there was minimal reduction in tolerant and no reduction in highly resistant varieties.”
Claim · model-written summary
Pod growth rate correlated positively and highly with yield in seven susceptible and five of eight resistant cowpea varieties.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- Pode0
- Interactor
- CABMVCowpea aphid-borne mosaic viruse0pathogen
- Outcome
- yielde0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod growth rate correlated (p > 0.05) positively and highly with the yield in seven susceptible varieties and in 5 of the 8 resistant varieties infected by CABMV and BCMV-BlC”
t0“cowpea varieties infected with two cowpea potyviruses”
Claim · model-written summary
Cowpea yield decreased as disease severity increased.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- disease severity increasede0
- Outcome
- cowpea yielde0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as disease severity increased cowpea yield decreased”
Claim · model-written summary
BCMV-BlC reduced seed yield by 62 to 87% in some cowpea varieties.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- mechanically inoculatede1
- Interactor
- BCMV-BlCe0pathogen
- Outcome
- seed yielde0
- Direction
- reducede0
- Value
- 62 to 87%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BCMV-BlC reduced the seed yield between 62 to 87% and CABMV between 54 to 87% in some cowpea varieties.”
e1“Isolates of the viruses were mechanically inoculated into the cowpea lines”
Claim · model-written summary
CABMV reduced seed yield by 54 to 87% in some cowpea varieties.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- mechanically inoculatede1
- Interactor
- CABMVCowpea aphid-borne mosaic viruse0pathogen
- Outcome
- seed yielde0
- Direction
- reducede0
- Value
- 54 to 87%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BCMV-BlC reduced the seed yield between 62 to 87% and CABMV between 54 to 87% in some cowpea varieties.”
e1“Isolates of the viruses were mechanically inoculated into the cowpea lines”
The same questions in other papers
inoculation · yield · Vigna unguiculata (cowpea)Results differ
16 papers in the same direction as this paper · 99 in the opposite direction
- positive
- positive
- positive
112 papers more in this group
See all 116 papers →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.