Abstract
Lentil (Lens culinaris Medik.) production in arable, Mediterranean-type climates is limited by heat waves and unreliable rainfall. Under climate change scenarios, increased atmospheric carbon dioxide (CO2) concentration will increase plant growth; however, the net effect of increasing occurrence and intensity of heat waves and drought is unclear. This study tested the response of combined acute high temperature (>32°C) at the early pod-filling stage and (i) crop-available soil water, and (ii) elevated CO2 on three lentil genotypes in two experiments. The three lentil genotypes selected were commercial cultivar PBA Bolt and two landraces sourced from the Australian Grains Genebank, AGG 71457 and AGG 73838. High soil-water availability (0.42 Mg m–3) throughout the growing season increased yield by 28% compared with low soil-water availability (0.35 Mg m–3). Across contrasting water treatments, there was no difference in patterns of crop response to high temperature during the early pod-filling phase (5 days at 42°C daytime, 25°C night), where yields were reduced by 45%. A significant interaction between high temperature response and genotype was observed, where reduction in grain number was higher for AGG 73838 (0.20% per degree-hour >32°C) than for AGG 71457 (0.07% per degree-hour >32°C) or PBA Bolt (0.10% per degree-hour >32°C). For heat and CO2 effects, there was no significant interaction between high temperature (3 days at 38°C daytime, ambient night temperature) and CO2 treatment on yield components. There was, however, an overall trend of increased biomass, grain number and yield due to elevated CO2. Although non-limiting soil water did not reduce the impact of high temperature in this study, the range in response across genotypes to high temperature supports opportunity for increased adaptation of lentil toward increasing yield stability under effects of climate change.
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Claims 6
Claim · model-written summary
High soil water increased lentil yield by 28%.
- Taxon
- lentil
Lens culinarist0 - Treatment
- High soil-water availability (0.42 Mg m–3)e0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 28%e0
- Comparator
- low soil-water availability (0.35 Mg m–3)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High soil-water availability (0.42 Mg m–3) throughout the growing season increased yield by 28% compared with low soil-water availability (0.35 Mg m–3).”
t0“Response of lentil to high temperature under variable water supply and carbon dioxide enrichment”
Claim · model-written summary
High temperature reduced lentil yield by 45% across water treatments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across contrasting water treatments, there was no difference in patterns of crop response to high temperature during the early pod-filling phase (5 days at 42°C daytime, 25°C night), where yields were reduced by 45%.”
t0“Response of lentil to high temperature under variable water supply and carbon dioxide enrichment”
Claim · model-written summary
Water treatments did not change the pattern of lentil response to heat.
- Taxon
- lentilLens culinarist0
- Outcome
- patterns of crop response to high temperaturee0
- Direction
- no differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across contrasting water treatments, there was no difference in patterns of crop response to high temperature during the early pod-filling phase”
t0“Response of lentil to high temperature under variable water supply and carbon dioxide enrichment”
Claim · model-written summary
Heat reduced grain number more in AGG 73838 than AGG 71457 or PBA Bolt.
- Taxon
- lentilLens culinarist0
- Material
- AGG 73838e0
- Outcome
- grain numbere0
- Direction
- highere0
- Value
- 0.20% per degree-hour >32°Ce0
- Comparator
- AGG 71457e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in grain number was higher for AGG 73838 (0.20% per degree-hour >32°C) than for AGG 71457 (0.07% per degree-hour >32°C) or PBA Bolt (0.10% per degree-hour >32°C)”
t0“Response of lentil to high temperature under variable water supply and carbon dioxide enrichment”
Claim · model-written summary
Heat and CO2 did not significantly interact for lentil yield components.
- Taxon
- lentilLens culinarist0
- Treatment
- high temperaturee0
- Outcome
- yield componentse0
- Direction
- no significant interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant interaction between high temperature (3 days at 38°C daytime, ambient night temperature) and CO2 treatment on yield components.”
t0“Response of lentil to high temperature under variable water supply and carbon dioxide enrichment”
Claim · model-written summary
Elevated CO2 tended to increase biomass, grain number and yield.
- Taxon
- lentilLens culinarist0
- Treatment
- elevated CO2e0
- Outcome
- biomass, grain number and yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was, however, an overall trend of increased biomass, grain number and yield due to elevated CO2.”
t0“Response of lentil to high temperature under variable water supply and carbon dioxide enrichment”
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