Abstract
Heat stress around flowering is harmful to maize growth and yield. Ear traits are closely related to yield; however, the effects of heat stress before and after flowering on ear development and yield traits remain unclear for different heat-tolerant cultivars. In this study, field experiments were conducted in 2020 and 2021, including (i) three sowing dates, (ii) three temperature regimes: control (CK), heated before silking (V9-R1, TBS) and heated after silking (R1-R1 + 15 d, TAS), and (iii) two hybrids (ZD958: heat-tolerant; DH605: heat-sensitive). The results showed that heating had negative effects on all surveyed ear and yield traits except for increased ear length under TBS. The negative effects were larger (i) for TAS than for TBS, (ii) for DH605 than for ZD958, and (iii) for kernel number per plant (KNP) than for kernel weight (KW). The decreased ear traits were a result of a decreased growth rate during rapid ear growth periods. Floret pollination failure and kernel abortion were the main reasons for the decrease in KNP, mainly depending on the daily maximum temperature during V15-R1 + 7 d. The strong linear relationships between ear and yield traits suggested that ear traits could be used as important indicators for breeding heat-resistant varieties in the future.
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Claims 10
Claim · model-written summary
Heating had negative effects on all surveyed ear and yield traits compared with the control.
- Treatment
- heatinge0
- Outcome
- ear and yield traitse0
- Direction
- negativee0
- Comparator
- control (CK)e1
- Setting
- field experimentse3
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that heating had negative effects on all surveyed ear and yield traits except for increased ear length under TBS”
e1“three temperature regimes: control (CK), heated before silking (V9-R1, TBS) and heated after silking (R1-R1 + 15 d, TAS)”
e2“Heat stress around flowering is harmful to maize growth and yield”
e3“field experiments were conducted in 2020 and 2021”
Claim · model-written summary
Heating before silking increased ear length compared with the control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that heating had negative effects on all surveyed ear and yield traits except for increased ear length under TBS”
e1“three temperature regimes: control (CK), heated before silking (V9-R1, TBS) and heated after silking (R1-R1 + 15 d, TAS)”
e2“Heat stress around flowering is harmful to maize growth and yield”
Claim · model-written summary
Negative effects of heating were larger after silking (TAS) than before silking (TBS).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Heat stress around flowering is harmful to maize growth and yield”
e4“The negative effects were larger (i) for TAS than for TBS, (ii) for DH605 than for ZD958, and (iii) for kernel number per plant (KNP) than for kernel weight (KW)”
Claim · model-written summary
Negative effects of heating were larger in the heat-sensitive hybrid DH605 than in ZD958.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that heating had negative effects on all surveyed ear and yield traits except for increased ear length under TBS”
e2“Heat stress around flowering is harmful to maize growth and yield”
e4“The negative effects were larger (i) for TAS than for TBS, (ii) for DH605 than for ZD958, and (iii) for kernel number per plant (KNP) than for kernel weight (KW)”
Claim · model-written summary
Negative effects of heating on kernel number per plant were larger than on kernel weight.
- Treatment
- heatinge0
- Outcome
- kernel number per plant (KNP)e4
- Direction
- largere4
- Comparator
- kernel weight (KW)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that heating had negative effects on all surveyed ear and yield traits except for increased ear length under TBS”
e2“Heat stress around flowering is harmful to maize growth and yield”
e4“The negative effects were larger (i) for TAS than for TBS, (ii) for DH605 than for ZD958, and (iii) for kernel number per plant (KNP) than for kernel weight (KW)”
Claim · model-written summary
Decreased ear traits resulted from a decreased growth rate during rapid ear growth periods.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Heat stress around flowering is harmful to maize growth and yield”
e5“The decreased ear traits were a result of a decreased growth rate during rapid ear growth periods”
Claim · model-written summary
Floret pollination failure and kernel abortion were the main reasons for the decrease in kernel number per plant.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Heat stress around flowering is harmful to maize growth and yield”
e6“Floret pollination failure and kernel abortion were the main reasons for the decrease in KNP, mainly depending on the daily maximum temperature during V15-R1 + 7 d”
Claim · model-written summary
Kernel number per plant depended on the daily maximum temperature during V15-R1 + 7 d.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Heat stress around flowering is harmful to maize growth and yield”
e6“Floret pollination failure and kernel abortion were the main reasons for the decrease in KNP, mainly depending on the daily maximum temperature during V15-R1 + 7 d”
Claim · model-written summary
Ear and yield traits were strongly and linearly related.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Heat stress around flowering is harmful to maize growth and yield”
e7“The strong linear relationships between ear and yield traits suggested that ear traits could be used as important indicators for breeding heat-resistant varieties in the future”
Claim · model-written summary
Ear traits could be used as indicators for breeding heat-resistant maize varieties.
- Outcome
- indicators for breeding heat-resistant varietiese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Heat stress around flowering is harmful to maize growth and yield”
e7“The strong linear relationships between ear and yield traits suggested that ear traits could be used as important indicators for breeding heat-resistant varieties in the future”
The same questions in other papers
heat · yield · Zea mays (maize)Positive and negative results
67 papers in the same direction as this paper · 17 in the opposite direction
- positive
- negative
- negative
81 papers more in this group
See all 85 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.