Abstract
Climate change is expected to aggravate the effects of drought, heat and combined drought and heat stresses. An important step in developing 'climate smart' maize varieties is to identify germplasm with good levels of tolerance to the abiotic stresses. The primary objective of this study was to identify landraces with combined high yield potential and desirable secondary traits under drought, heat and combined drought and heat stresses. Thirty-three landraces from Burkina Faso (6), Ghana (6) and Togo (21), and three drought-tolerant populations/varieties from the Maize Improvement Program at the International Institute of Tropical Agriculture were evaluated under three conditions, namely managed drought stress, heat stress and combined drought and heat stress, with optimal growing conditions as control, for two years. The phenotypic and genetic correlations between grain yield of the different treatments were very weak, suggesting the presence of independent genetic control of yield to these stresses. However, grain yield under heat and combined drought and heat stresses were highly and positively correlated, indicating that heat-tolerant genotypes would most likely tolerate combined drought and stress. Yield reduction averaged 46% under managed drought stress, 55% under heat stress, and 66% under combined drought and heat stress, which reflected hypo-additive effect of drought and heat stress on grain yield of the maize accessions. Accession GH-3505 was highly tolerant to drought, while GH-4859 and TZm-1353 were tolerant to the three stresses. These landrace accessions can be invaluable sources of genes/alleles for breeding for adaptation of maize to climate change.
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Claims 10
Claim · model-written summary
Grain yields under different treatments showed weak phenotypic and genetic correlations.
- Treatment
- different treatmentse0
- Outcome
- phenotypic and genetic correlations between grain yielde0
- Direction
- very weake0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phenotypic and genetic correlations between grain yield of the different treatments were very weak, suggesting the presence of independent genetic control of yield to these stresses.”
t0“Maize”
Claim · model-written summary
Heat and combined stress yields were strongly positively correlated.
- Treatment
- heat and combined drought and heat stressese0
- Outcome
- grain yielde0
- Direction
- highly and positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield under heat and combined drought and heat stresses were highly and positively correlated”
t0“Maize”
Claim · model-written summary
Managed drought reduced average yield by 46%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield reduction averaged 46% under managed drought stress, 55% under heat stress, and 66% under combined drought and heat stress”
t0“Maize”
Claim · model-written summary
Heat reduced average yield by 55%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield reduction averaged 46% under managed drought stress, 55% under heat stress, and 66% under combined drought and heat stress”
t0“Maize”
Claim · model-written summary
Combined drought and heat reduced average yield by 66%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield reduction averaged 46% under managed drought stress, 55% under heat stress, and 66% under combined drought and heat stress”
t0“Maize”
Claim · model-written summary
Combined stress showed a hypo-additive effect on maize yield.
- Outcome
- hypo-additive effect of drought and heat stress on grain yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which reflected hypo-additive effect of drought and heat stress on grain yield of the maize accessions.”
t0“Maize”
Claim · model-written summary
GH-3505 was highly drought tolerant.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accession GH-3505 was highly tolerant to drought, while GH-4859 and TZm-1353 were tolerant to the three stresses.”
t0“Maize”
Claim · model-written summary
GH-4859 tolerated all three stresses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GH-4859 and TZm-1353 were tolerant to the three stresses.”
t0“Maize”
Claim · model-written summary
TZm-1353 tolerated all three stresses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GH-4859 and TZm-1353 were tolerant to the three stresses.”
t0“Maize”
Claim · model-written summary
The authors identify these landraces as breeding sources for climate adaptation.
- Outcome
- sources of genes/alleles for breeding for adaptatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These landrace accessions can be invaluable sources of genes/alleles for breeding for adaptation of maize to climate change.”
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