Abstract
Abstract Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity. The objectives of this research were to estimate the impact of genotype × environment interactions (G × E) in sweetpotato and select genotypes based on drought indices such as geometric mean, percent yield reduction, drought sensitivity index and harvest index. A total of 58 clones were evaluated during the dry season of 2006, 2008 and 2009. Two treatments were applied for this multi-year trial: full irrigation and without irrigation at the middle of root initiation growth stage. The field layout was a randomized complete block design with three replications. ‘Jonathan’, ‘Resisto’ and ‘Tanzania’ were the check cultivars in each treatment. Storage root and vine yields were recorded at harvest in the trials. Harvest index was computed from the yield data. The analysis of variance, regression and the additive main effects multiplicative interaction (AMMI) analyses, plus phenotypic coefficient of variation and ecovalence were used for dissecting the G × E and assessing the stability of each clone. Treatment, genotype × treatment and genotype × year (G × Y) interactions had highest contributions to the variation in storage root yield observed among clones. The stability of harvest index was significantly correlated with the absolute AMMI’s IPCA1 and IPCA2 values for storage root yield. Cultivar performance varied within treatments. Four clones had significantly higher storage root yield (t ha −1 ) than ‘Tanzania’, the best check cultivar under drought. In conclusion, storage root yield (t ha −1 ) was negatively affected by drought and G × Y interaction. Harvest index stability and the geometric mean may be key to identify clones with storage root yield stability and high storage root yield under both treatments. At least two environments should be used at early breeding stages to consider harvest index in the early breeding cycle.
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Claims 7
Claim · model-written summary
Treatment, genotype x treatment and genotype x year interactions contributed most to the variation in storage root yield among clones.
- Taxon
- Sweetpotato
_Flower.jpg?width=60)
Ipomoea batatase0 - Material
- clonese1
- Outcome
- variation in storage root yielde1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
e1“Treatment, genotype × treatment and genotype × year (G × Y) interactions had highest contributions to the variation in storage root yield observed among clones”
Claim · model-written summary
Stability of harvest index was significantly correlated with the absolute AMMI IPCA1 and IPCA2 values for storage root yield.
- Taxon
- SweetpotatoIpomoea batatase0
- Outcome
- stability of harvest indexe2
- Comparator
- absolute AMMI’s IPCA1 and IPCA2 valuese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The stability of harvest index was significantly correlated with the absolute AMMI’s IPCA1 and IPCA2 values for storage root yield”
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
Claim · model-written summary
Cultivar performance varied within treatments.
- Taxon
- SweetpotatoIpomoea batatase0
- Outcome
- Cultivar performancee3
- Qualifier
- within treatmentse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Cultivar performance varied within treatments”
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
Claim · model-written summary
Four clones had significantly higher storage root yield than the check cultivar Tanzania under drought.
- Taxon
- SweetpotatoIpomoea batatase0
- Material
- clonese4
- Treatment
- under droughte4
- Outcome
- storage root yielde4
- Direction
- highere4
- Qualifier
- Four clonese4
- Comparator
- Tanzaniae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Four clones had significantly higher storage root yield (t ha −1 ) than ‘Tanzania’, the best check cultivar under drought”
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
Claim · model-written summary
Storage root yield was negatively affected by drought and by the G x Y interaction.
- Taxon
- SweetpotatoIpomoea batatase0
- Treatment
- drought and G × Y interactione5
- Outcome
- storage root yielde5
- Direction
- negatively affectede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In conclusion, storage root yield (t ha −1 ) was negatively affected by drought and G × Y interaction”
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
Claim · model-written summary
Harvest index stability and the geometric mean may identify clones with storage root yield stability and high yield under both treatments.
- Taxon
- SweetpotatoIpomoea batatase0
- Outcome
- identify clones with storage root yield stability and high storage root yielde6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Harvest index stability and the geometric mean may be key to identify clones with storage root yield stability and high storage root yield under both treatments”
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
Claim · model-written summary
At least two environments should be used at early breeding stages to consider harvest index.
- Taxon
- SweetpotatoIpomoea batatase0
- Outcome
- At least two environments should be used at early breeding stagese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“At least two environments should be used at early breeding stages to consider harvest index in the early breeding cycle”
e0“Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity”
The same questions in other papers
drought · yield · Ipomoea batatas (sweet potato)Positive and negative results
3 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- negative
9 papers more in this group
See all 13 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.