Abstract
A study was carried out to estimate percent heritability and correlation coefficients of desirable maize agronomic characters under artificial infestation with Striga lutea. Forty five F1 hybrid maize of varied striga tolerance and their ten parents inbred were evaluated along with two check entries. This was sited in three locations representing different agro ecologies of south western Nigeria in 1999 cropping season. The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively. Genotypic correlation coefficients of striga emergence count with maize agronomic traits were positive and significant, while phenotypic correlation between striga count and other maize agronomic traits were also positively and significantly correlated, except striga count which was negatively correlated with striga syndrome rating. On the other hand, maize ear aspect alone contributed 19.4% to grain yield, while inherent yield loss of 23.0% was estimated if striga is left uncontrolled. Parameter estimates revealed that all striga and maize agronomic traits were positively associated with grain yield except plant and ear heights under striga infestation. Although, implications of these estimates have been discussed, this study affirmed that genotypic and phenotypic correlation coefficients as well as heritability estimates were found suitable as models for yield improvement and selection for S. lutea tolerant genotypes. Key words: Heritability estimates, correlation coefficient, striga tolerance rating, grain yield.
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Claims 14
Claim · model-written summary
Heritability estimate for striga emergence count was 94.0%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- heritability estimatese1
- Value
- 94.0e1
- Qualifier
- for striga emergence counte1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Heritability estimate for striga syndrome rating was 40.0%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- heritability estimatese1
- Value
- 40.0e1
- Qualifier
- striga syndrome ratinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Heritability estimate for tolerance index was 13.0%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- tolerance indexe1
- Value
- 13.0e1
- Qualifier
- low heritability estimatese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Heritability estimate for days to tasseling was 11.32%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- days to tasselinge1
- Value
- 11.32e1
- Qualifier
- low heritability estimatese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Heritability estimate for days silking was 16.0%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- days silkinge1
- Value
- 16.0e1
- Qualifier
- low heritability estimatese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Heritability estimate for kernel rows per cob was 5.70%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- kernel rows/cobe1
- Value
- 5.70e1
- Qualifier
- low heritability estimatese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Heritability estimate for grain yield was 16.22%.
- Interactor
- Striga luteaStriga luteae0parasite
- Outcome
- grain yielde1
- Value
- 16.22%e1
- Qualifier
- low heritability estimatese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e0“artificial infestation with Striga lutea”
e1“The results showed high and moderate heritability estimates of 94.0 and 40.0 for striga emergence count and striga syndrome rating respectively, while low heritability estimates of 13.0, 11.32, 16.0, 5.70 and 16.22% were obtained for tolerance index, days to tasseling, days silking, kernel rows/cob and grain yield respectively.”
Claim · model-written summary
Genotypic correlations of striga emergence count with maize agronomic traits were positive and significant.
StrigaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e2“Genotypic correlation coefficients of striga emergence count with maize agronomic traits were positive and significant”
Claim · model-written summary
Phenotypic correlations of striga count with other maize agronomic traits were positive and significant.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e3“phenotypic correlation between striga count and other maize agronomic traits were also positively and significantly correlated”
Claim · model-written summary
Striga count was negatively correlated with striga syndrome rating.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e4“except striga count which was negatively correlated with striga syndrome rating”
Claim · model-written summary
Maize ear aspect alone contributed 19.4% to grain yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e5“maize ear aspect alone contributed 19.4% to grain yield”
Claim · model-written summary
Inherent yield loss of 23.0% was estimated if striga is left uncontrolled.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e6“inherent yield loss of 23.0% was estimated if striga is left uncontrolled”
Claim · model-written summary
Most striga and maize agronomic traits were positively associated with grain yield under striga infestation, except plant and ear heights.
- Treatment
- striga infestatione7
- Outcome
- grain yielde7
- Direction
- positively associatede7
- Qualifier
- except plant and ear heightse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e7“all striga and maize agronomic traits were positively associated with grain yield except plant and ear heights under striga infestation”
Claim · model-written summary
Genotypic and phenotypic correlations and heritability estimates are suitable models for selecting S. lutea tolerant maize genotypes.
- Outcome
- selection for S. lutea tolerant genotypese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“estimates of maize agronomic traits”
e1“genotypic and phenotypic correlation coefficients as well as heritability estimates were found suitable as models for yield improvement and selection for S. lutea tolerant genotypes”