Abstract
The concept of a linear increase in harvest index, dHI/dt, has proven very useful for crop simulation modeling. The effect of high temperature on the response of dHI/dt of pods and seeds of peanut (Arachis hypogaea L.) has not been described. The objectives of this work were to determine (i) whether dHI/dt was linear at high temperature, (ii) whether high temperature affected dHI/dt and/or the timing of the linear phase of increase in HI, and (iii) whether there was genotypic variation in the response of dHI/dt to high temperature. Four peanut genotypes varying in heat tolerance were grown in pots at either 28/22 or 38/22 degrees C from 21 to 90 d after planting (DAP). Plants were harvested on 10 occasions starting 27 DAP and total dry matter accumulation and partitioning measured. High temperature reduced total dry weight by 20 to 35%, seed HI by 0 to 65%, and seed dry weight by 23 to 78%. At 28/22 degrees C, dHI/dt for pods and seeds was linear and varied from 0.0058 to 0.0109 d(-1). At 38/22 degrees C, dHI/dt of pods and seeds was also linear and varied from 0.0028 to 0.0089 d(-1). There were genotypic differences in response to temperature. High temperature had no effect on dHI/dt in moderately tolerant genotypes 796 and 47-16. In susceptible genotypes ICGV 86016 and ICGV 87282, however, the start of pod and seed filling was delayed by 5 to 9 d and dHI/dt reduced by 20 to 65% at 38/22 degrees C. Reductions in pod and seed dry weight at 38/22 degrees C were therefore due to reductions in total dry matter and dHI/dt, depending on the heat tolerance of the genotype. Crop models need to account for genotypic differences in the response of timing and rate of dHI/dt to high temperature to successfully simulate yields in warmer environments.
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Claims 11
Claim · model-written summary
High temperature reduced peanut total dry weight by 20 to 35%.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- High temperaturee0
- Outcome
- total dry weighte0
- Direction
- reducede0
- Value
- 20 to 35%e0
- Comparator
- 28/22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature reduced total dry weight by 20 to 35%”
e1“either 28/22 or 38/22 degrees C”
t0“Peanut”
Claim · model-written summary
High temperature reduced peanut seed harvest index by 0 to 65%.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- High temperaturee1
- Outcome
- seed HIe0
- Direction
- reducede1
- Value
- 0 to 65%e0
- Comparator
- 28/22e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed HI by 0 to 65%”
e1“High temperature reduced total dry weight by 20 to 35%, seed HI”
e2“either 28/22 or 38/22 degrees C”
t0“Peanut”
Claim · model-written summary
High temperature reduced peanut seed dry weight by 23 to 78%.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- High temperaturee0
- Outcome
- seed dry weighte0
- Direction
- reducede0
- Value
- 23 to 78%e0
- Comparator
- 28/22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature reduced total dry weight by 20 to 35%, seed HI by 0 to 65%, and seed dry weight by 23 to 78%.”
e1“either 28/22 or 38/22 degrees C”
t0“Peanut”
Claim · model-written summary
At 28/22 degrees C, pod and seed dHI/dt was linear and ranged from 0.0058 to 0.0109 d(-1).
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- dHI/dt for pods and seedse0
- Value
- 0.0058 to 0.0109 d(-1)e0
- Qualifier
- 28/22 degrees Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 28/22 degrees C, dHI/dt for pods and seeds was linear and varied from 0.0058 to 0.0109 d(-1).”
t0“Peanut”
Claim · model-written summary
At 38/22 degrees C, pod and seed dHI/dt was linear and ranged from 0.0028 to 0.0089 d(-1).
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- dHI/dt of pods and seedse0
- Value
- 0.0028 to 0.0089 d(-1)e0
- Qualifier
- 38/22 degrees Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 38/22 degrees C, dHI/dt of pods and seeds was also linear and varied from 0.0028 to 0.0089 d(-1).”
t0“Peanut”
Claim · model-written summary
Peanut genotypes differed in their temperature response.
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- genotypic differences in response to temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were genotypic differences in response to temperature.”
t0“Peanut”
Claim · model-written summary
High temperature did not change dHI/dt in moderately tolerant peanut genotypes 796 and 47-16.
- Taxon
- PeanutArachis hypogaeat0
- Material
- 796 and 47-16e0
- Treatment
- High temperaturee0
- Outcome
- dHI/dte0
- Direction
- no effecte0
- Comparator
- 28/22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature had no effect on dHI/dt in moderately tolerant genotypes 796 and 47-16.”
e1“either 28/22 or 38/22 degrees C”
t0“Peanut”
Claim · model-written summary
At 38/22 degrees C, pod and seed filling started 5 to 9 d later in susceptible genotypes ICGV 86016 and ICGV 87282.
- Taxon
- PeanutArachis hypogaeat0
- Material
- ICGV 86016 and ICGV 87282e0
- Treatment
- 38/22 degrees Ce0
- Outcome
- start of pod and seed fillinge0
- Direction
- delayede0
- Value
- 5 to 9 de0
- Comparator
- 28/22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In susceptible genotypes ICGV 86016 and ICGV 87282, however, the start of pod and seed filling was delayed by 5 to 9 d and dHI/dt reduced by 20 to 65% at 38/22 degrees C.”
e1“either 28/22 or 38/22 degrees C”
t0“Peanut”
Claim · model-written summary
At 38/22 degrees C, dHI/dt fell by 20 to 65% in susceptible genotypes ICGV 86016 and ICGV 87282.
- Taxon
- PeanutArachis hypogaeat0
- Material
- ICGV 86016 and ICGV 87282e0
- Treatment
- 38/22 degrees Ce0
- Outcome
- dHI/dte0
- Direction
- reducede0
- Value
- 20 to 65%e0
- Comparator
- 28/22e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In susceptible genotypes ICGV 86016 and ICGV 87282, however, the start of pod and seed filling was delayed by 5 to 9 d and dHI/dt reduced by 20 to 65% at 38/22 degrees C.”
e1“either 28/22 or 38/22 degrees C”
t0“Peanut”
Claim · model-written summary
The authors attribute lower pod and seed dry weight at 38/22 degrees C to lower total dry matter and dHI/dt, depending on genotype heat tolerance.
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- Reductions in pod and seed dry weighte0
- Qualifier
- reductions in total dry matter and dHI/dte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in pod and seed dry weight at 38/22 degrees C were therefore due to reductions in total dry matter and dHI/dt, depending on the heat tolerance of the genotype.”
t0“Peanut”
Claim · model-written summary
The authors recommend that crop models include genotype differences in timing and rate of dHI/dt temperature response to simulate yield in warmer environments.
- Taxon
- PeanutArachis hypogaeat0
- Outcome
- account for genotypic differences in the response of timing and rate of dHI/dt to high temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop models need to account for genotypic differences in the response of timing and rate of dHI/dt to high temperature to successfully simulate yields in warmer environments.”
t0“Peanut”
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See all 9 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.