Abstract
The effects of drought and heat stress on physiology of two common cotton species, Gossypium hirsutum L. (Upland) and G. barbadense L. (Pima) were investigated in this study. Four consecutive 28-day pot experiments were carried out in a fully controlled growth chamber under four temperatures (25, 30, 35 and 40°C), while two water treatments (well-watered and drought) were imposed for 10 days to both cotton species. Growth according to dry matter accumulation of G. barbadense was more limited by sole drought conditions (50%), whereas heat stress was more remarkable on growth of G. hirsutum (64%). Chlorophyll (Chl) a and b content were more temperature-sensitive in G. hirsutum than G. barbadense under well-watered conditions. The most noticeable decrease in drought-induced rates of photosynthesis rate (Pn), transpiration rate (E) and stomatal conductance (gs) were recorded under 35°C, although genotypic variation was found under 25°C. Higher water use efficiency was associated with higher temperature. Relative decrease in Chl a content, gs and maximal quantum efficiency of PSII exhibited by both species were distinctive physiological traits for heat and drought tolerance.
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Claims 7
Claim · model-written summary
Drought limited G. barbadense dry matter growth by 50%.
- Taxon
- G. barbadense
.jpg?width=60)
Gossypium barbadensee0 - Treatment
- sole drought conditionse0
- Outcome
- dry matter accumulatione0
- Direction
- more limitede0
- Value
- 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Growth according to dry matter accumulation of G. barbadense was more limited by sole drought conditions (50%)”
Claim · model-written summary
Heat stress limited G. hirsutum growth by 64%.
- Taxon
- G. hirsutum
Gossypium hirsutume0 - Treatment
- heat stresse0
- Outcome
- growthe0
- Direction
- more remarkablee0
- Value
- 64%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stress was more remarkable on growth of G. hirsutum (64%)”
Claim · model-written summary
Chlorophyll a and b content was more temperature sensitive in G. hirsutum than G. barbadense when well watered.
- Taxon
- G. hirsutumGossypium hirsutume0
- Treatment
- well-watered conditionse0
- Outcome
- Chlorophyll (Chl) a and b contente0
- Direction
- more temperature-sensitivee0
- Comparator
- G. barbadensee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll (Chl) a and b content were more temperature-sensitive in G. hirsutum than G. barbadense under well-watered conditions”
Claim · model-written summary
Drought induced decreases in photosynthesis rate, transpiration rate, and stomatal conductance were most pronounced at 35°C.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- drought-inducede0
- Outcome
- photosynthesis rate (Pn), transpiration rate (E) and stomatal conductance (gs)e0
- Direction
- decreasee0
- Setting
- 35°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most noticeable decrease in drought-induced rates of photosynthesis rate (Pn), transpiration rate (E) and stomatal conductance (gs) were recorded under 35°C”
t0“cotton”
Claim · model-written summary
Genotypic variation in drought responses was found at 25°C.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- genotypic variatione0
- Setting
- 25°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypic variation was found under 25°C”
t0“cotton”
Claim · model-written summary
Higher water use efficiency was associated with higher temperature.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- higher temperaturee0
- Outcome
- water use efficiencye0
- Direction
- Highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher water use efficiency was associated with higher temperature”
t0“cotton”
Claim · model-written summary
Relative decreases in chlorophyll a, stomatal conductance and maximal PSII quantum efficiency were distinctive heat and drought tolerance traits in both species.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- heat and droughte0
- Outcome
- Chl a content, gs and maximal quantum efficiency of PSIIe0
- Direction
- decreasee0
- Qualifier
- heat and drought tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative decrease in Chl a content, gs and maximal quantum efficiency of PSII exhibited by both species were distinctive physiological traits for heat and drought tolerance”
t0“cotton”
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See all 53 papers →drought · yield · Gossypium barbadense (Egyptian cotton)Results agree
2 papers in the same direction as this paper
- negative
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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.