Abstract
Row spacing x genotype interaction caused by changes in genotype ranking could require twice the resources to identify superior genotypes. This study was conducted to estimate the magnitude of genotype x row spacing interaction and its effects on testing and selection procedures used in cowpea (Vigna unguiculata L. Walp) cultivar development. Ten genotypes were evaluated for grain yield and harvest index with 50 x 50 and 50 x 25 cm spacings, for two years at two locations. Within row spacing (WRS) did not have a significant effect on either trait. Genotype x within row spacing interaction effects were not significant, suggesting that selection at low densities would be effective in identifying superior and productive genotypes for further testing in either within row spacing. Because of significant genotype x environment and WRS interaction effects, this effectiveness would require stable genotypes to be tested for more than a year. Also preliminary testing of large populations in high-productivity environment only, would not maximise gain from selection in low-productivity zones. But the most productive genotypes in both zones can be identified through concomitant selection for yield in high-productivity environments and for harvest index in low-productivity conditions. RESUME Une interaction significative du génotype avec les écartements de semis, peut être due à des changements de classement des lignées. Elle peut ainsi doubler les ressources nécessaires pour identifier les meilleurs génotypes. Cette étude avait pour but d'estimer l'importance de cette interaction et ses effets sur la sélection et l'évaluation de variétés de niébé (Vigna unguiculata L. Walp). Dix lignées ont été évaluées avec les écartements de semis 50 x 50 et 50 x 25 cm, pendant deux années, dans deux localités. Ces écartements et leur interaction avec le génotype n'ont eu aucun effet significatif sur le rendement en graines et l'indice de récolte. La sélection dans les densités faibles serait alors efficace, pour identifier des génotypes supérieurs destinés aux écartements espacés ou serrés. L'interaction du génotype avec le milieu et les écartements étant significatif, l'efficacité de cette sélection s'appliquerait alors à des génotypes relativement stables, pouvant être évalués plus d'une fois. Aussi, des essais dans des zones favorables seulement, ne sauraient maximiser les gains de sélection pour les environnements défavorables. Cependant, la sélection concomitante pour le rendement en milieu favorable et pour l'indice de récolte en environnements défavorables, peut identifier les génotypes les plus productifs dans les deux zones. (African Crop Science Journal 2001 9(2): 359-368)
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Claims 6
Claim · model-written summary
Within-row spacing did not significantly affect grain yield or harvest index of cowpea.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- Within row spacinge1
- Outcome
- grain yield and harvest indexe2
- Direction
- no_changeinferrede1
- Setting
- two years at two locationse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotype x row spacing and environment interaction of cowpea in semi-arid zones”
e1“Within row spacing (WRS) did not have a significant effect on either trait”
e2“Ten genotypes were evaluated for grain yield and harvest index with 50 x 50 and 50 x 25 cm spacings, for two years at two locations”
Claim · model-written summary
Genotype x within-row-spacing interaction was not significant.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- Genotype x within row spacing interaction effectse3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotype x row spacing and environment interaction of cowpea in semi-arid zones”
e3“Genotype x within row spacing interaction effects were not significant”
Claim · model-written summary
Genotype x environment and within-row-spacing interaction effects were significant.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- genotype x environment and WRS interaction effectse4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotype x row spacing and environment interaction of cowpea in semi-arid zones”
e4“Because of significant genotype x environment and WRS interaction effects”
Claim · model-written summary
Stable genotypes should be tested for more than a year.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- stable genotypes to be tested for more than a yeare5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotype x row spacing and environment interaction of cowpea in semi-arid zones”
e5“would require stable genotypes to be tested for more than a year”
Claim · model-written summary
Preliminary testing of large populations in high-productivity environments only would not maximise selection gain in low-productivity zones.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- preliminary testing of large populations in high-productivity environment onlye6
- Outcome
- gain from selection in low-productivity zonese6
- Direction
- not maximisee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotype x row spacing and environment interaction of cowpea in semi-arid zones”
e6“Also preliminary testing of large populations in high-productivity environment only, would not maximise gain from selection in low-productivity zones”
Claim · model-written summary
The most productive genotypes in both zones can be identified by concomitant selection for yield in high-productivity environments and for harvest index in low-productivity conditions.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- concomitant selection for yield in high-productivity environments and for harvest index in low-productivity conditionse7
- Outcome
- most productive genotypes in both zonese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotype x row spacing and environment interaction of cowpea in semi-arid zones”
e7“the most productive genotypes in both zones can be identified through concomitant selection for yield in high-productivity environments and for harvest index in low-productivity conditions”
The same questions in other papers
density · yield · Vigna unguiculata (cowpea)Positive and negative results
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See all 63 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.