Abstract
Maize landrace accessions constitute an invaluable gene pool of unexplored alleles that can be harnessed to mitigate the challenges of the narrowing genetic base, declined genetic gains, and reduced resilience to abiotic stress in modern varieties developed from repeated recycling of few superior breeding lines. The objective of this study was to identify extra-early maize landraces that express tolerance to drought and/or heat stress and maintain high grain yield (GY) with other desirable agronomic/morpho-physiological traits. Field experiments were carried out over two years on 66 extra-early maturing maize landraces and six drought and/or heat-tolerant populations under drought stress (DS), heat stress (HS), combined both stresses (DSHS), and non-stress (NS) conditions as a control. Wide variations were observed across the accessions for measured traits under each stress, demonstrating the existence of substantial natural variation for tolerance to the abiotic stresses in the maize accessions. Performance under DS was predictive of yield potential under DSHS, but tolerance to HS was independent of tolerance to DS and DSHS. The accessions displayed greater tolerance to HS (23% yield loss) relative to DS (49% yield loss) and DSHS (yield loss = 58%). Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses. These landrace accessions should be further explored to identify the genes underlying their high tolerance and they could be exploited in maize breeding as a resource for broadening the genetic base and increasing the abiotic stress resilience of elite maize varieties.
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Claims 11
Claim · model-written summary
Accessions varied widely in measured traits under each stress.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wide variations were observed across the accessions for measured traits under each stress”
t0“Maize”
Claim · model-written summary
Performance under drought stress predicted yield potential under combined stress.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Performance under DS was predictive of yield potential under DSHS”
t0“Maize”
Claim · model-written summary
Heat tolerance was independent of drought and combined stress tolerance.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tolerance to HS was independent of tolerance to DS and DSHS”
t0“Maize”
Claim · model-written summary
Heat stress caused 23% yield loss.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater tolerance to HS (23% yield loss) relative to DS (49% yield loss) and DSHS (yield loss = 58%)”
t0“Maize”
Claim · model-written summary
Drought stress caused 49% yield loss.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater tolerance to HS (23% yield loss) relative to DS (49% yield loss) and DSHS (yield loss = 58%)”
t0“Maize”
Claim · model-written summary
Combined drought and heat stress caused 58% yield loss.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater tolerance to HS (23% yield loss) relative to DS (49% yield loss) and DSHS (yield loss = 58%)”
t0“Maize”
Claim · model-written summary
TZm-1162 adapted well to all three stresses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses”
t0“Maize”
Claim · model-written summary
TZm-1167 adapted well to all three stresses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses”
t0“Maize”
Claim · model-written summary
TZm-1472 adapted well to all three stresses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses”
t0“Maize”
Claim · model-written summary
TZm-1508 adapted well to all three stresses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses”
t0“Maize”
Claim · model-written summary
The authors recommend exploring tolerant landraces for genes and breeding use.
- Outcome
- further explored to identify the genes underlying their high tolerance and they could be exploited in maize breedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These landrace accessions should be further explored to identify the genes underlying their high tolerance and they could be exploited in maize breeding as a resource for broadening the genetic base and increasing the abiotic stress resilience of elite maize varieties”
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