Abstract
L., from flowering to seed development, to two temperature and water treatments and a combination of these treatments. The diffusional limitations of stomatal conductance and mesophyll conductance on photosynthesis, as well as resource-use efficiency (particularly water and nitrogen), were assessed. In addition, the effects of stressors on the seed fatty acid content and composition and the total protein content were examined. The results showed that the reduction in the net photosynthetic assimilation rate was caused by combinations of heat and drought (heat + drought) treatments, by drought alone, and, to a lesser extent, by heat alone. The stomatal conductance decreased under drought and heat + drought treatments but not under heat. Conversely, the mesophyll conductance was reduced significantly in the plants exposed to heat and heat + drought but not in the plants exposed to drought alone. The carboxylation efficiency rate and the electron transport rate were reduced under the heat treatment. The seed yield was reduced by 85.3% under the heat treatment and, to a lesser extent, under the drought treatment (31%). This emphasizes the devastating effects of hotter weather on seed formation and development. Seed oil content decreased by 52% in the plants exposed to heat, the protein content increased under all the stress treatments. Heat treatment had a more deleterious effect than drought on the seed oil composition, leading to enhanced levels of saturated fatty oils and, consequently, desaturation efficiency, a measure of oil frying ability. Overall, this study showed that except for the photosynthetic assimilation rate and stomatal conductance, heat, rather than drought, negatively affected the photosynthetic capacity, yield, and oil quality attributes when imposed during the flowering and silique-filling stages. This result highlights the necessity for a better understanding of heat tolerance mechanisms in crops to help to create germplasms that are adapted to rapid climate warming.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 17
Claim · model-written summary
Heat plus drought reduced net photosynthetic assimilation.
- Taxon
- Canola
.jpg?width=60)
Brassica napus var. napust0 - Treatment
- heat + droughte0
- Outcome
- net photosynthetic assimilation ratee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The results showed that the reduction in the net photosynthetic assimilation rate was caused by combinations of heat and drought (heat + drought) treatments”
t0“Canola”
Claim · model-written summary
Drought reduced net photosynthetic assimilation.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- drought alonee0
- Outcome
- net photosynthetic assimilation ratee1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by drought alone, and, to a lesser extent, by heat alone.”
t0“Canola”
e1“the reduction in the net photosynthetic assimilation rate”
Claim · model-written summary
Heat reduced net photosynthetic assimilation to a lesser extent.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heat alonee0
- Outcome
- net photosynthetic assimilation ratee1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by drought alone, and, to a lesser extent, by heat alone.”
t0“Canola”
e1“the reduction in the net photosynthetic assimilation rate”
Claim · model-written summary
Drought decreased stomatal conductance.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- droughte0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal conductance decreased under drought and heat + drought treatments but not under heat.”
t0“Canola”
Claim · model-written summary
Combined heat and drought decreased stomatal conductance.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heat + droughte0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal conductance decreased under drought and heat + drought treatments but not under heat.”
t0“Canola”
Claim · model-written summary
Heat did not decrease stomatal conductance.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heate0
- Outcome
- stomatal conductancee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal conductance decreased under drought and heat + drought treatments but not under heat.”
t0“Canola”
Claim · model-written summary
Heat significantly reduced mesophyll conductance.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heate0
- Outcome
- mesophyll conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mesophyll conductance was reduced significantly in the plants exposed to heat and heat + drought but not in the plants exposed to drought alone.”
t0“Canola”
Claim · model-written summary
Combined heat and drought significantly reduced mesophyll conductance.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heat + droughte0
- Outcome
- mesophyll conductancee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mesophyll conductance was reduced significantly in the plants exposed to heat and heat + drought but not in the plants exposed to drought alone.”
t0“Canola”
Claim · model-written summary
Drought alone did not reduce mesophyll conductance.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- drought alonee0
- Outcome
- mesophyll conductancee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mesophyll conductance was reduced significantly in the plants exposed to heat and heat + drought but not in the plants exposed to drought alone.”
t0“Canola”
Claim · model-written summary
Heat reduced carboxylation efficiency and electron transport rates.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heat treatmente0
- Outcome
- carboxylation efficiency rate and the electron transport ratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carboxylation efficiency rate and the electron transport rate were reduced under the heat treatment.”
t0“Canola”
Claim · model-written summary
Heat reduced seed yield by 85.3%.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heat treatmente0
- Outcome
- seed yielde0
- Direction
- reducede0
- Value
- 85.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seed yield was reduced by 85.3% under the heat treatment”
t0“Canola”
Claim · model-written summary
Drought reduced seed yield by 31%.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- drought treatmente0
- Outcome
- seed yielde0
- Direction
- reducede0
- Value
- 31%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seed yield was reduced by 85.3% under the heat treatment and, to a lesser extent, under the drought treatment (31%).”
t0“Canola”
Claim · model-written summary
Heat decreased seed oil content by 52%.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heate0
- Outcome
- Seed oil contente0
- Direction
- decreasede0
- Value
- 52%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed oil content decreased by 52% in the plants exposed to heat”
t0“Canola”
Claim · model-written summary
Heat increased protein content.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heate1
- Outcome
- protein contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protein content increased under all the stress treatments.”
t0“Canola”
e1“plants exposed to heat, the protein content increased”
Claim · model-written summary
Drought increased protein content.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- droughte1
- Outcome
- protein contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protein content increased under all the stress treatments.”
t0“Canola”
e1“under the drought treatment (31%).”
Claim · model-written summary
Combined heat and drought increased protein content.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- heat + droughte1
- Outcome
- protein contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protein content increased under all the stress treatments.”
t0“Canola”
e1“drought (heat + drought) treatments”
Claim · model-written summary
Heat increased saturated fatty oils.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- Heat treatmente0
- Outcome
- saturated fatty oilse0
- Direction
- enhancede0
- Comparator
- droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat treatment had a more deleterious effect than drought on the seed oil composition, leading to enhanced levels of saturated fatty oils”
t0“Canola”
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