Abstract
Abstract Drought stress is one of the most important abiotic factors which adversely affect growth, metabolism and yield of crops worldwide. The objective of this study was to determine the effects of drought stress on photosynthesis in barley and examine the differential responses of photosynthetic apparatus in relatively tolerant (Yousof) and susceptible (Morocco) barley genotypes. Plants were subjected to different levels of soil water availability including control, mild and severe drought stress. In both genotypes, drought stress led to decrease in chlorophylls, β‐carotene and stomatal conductance accompanied by decrease in CO 2 assimilation rate. Significant increase in α ‐ tochoperol content was only observed in Yousof cultivar under drought stress. Initial slope and plateau phase of CO 2 response curve of drought‐stressed plants as well as polyphasic chlorophyll a fluorescence transient curve ( OJIP test) and fast fluorescence induction kinetics were influenced by drought stress. These parameters were more affected in Morocco cultivar by drought stress compare with Yousof. Drought stress also resulted in reduction of D1 protein content in both genotypes and accelerated photoinhibition process. Based on our results, stomatal conductance is the main factor limiting photosynthesis in Yousof genotype under mild drought stress. However, in Morocco, in addition to stomatal limitation, damage to photosystem II ( PSII ), reduced electron transport and carboxylation efficiencies were important parts of limitation in photosynthesis. Severe drought stress resulted in structural and biochemical impairment of light‐dependent reactions as well as carboxylation process of photosynthesis in both genotypes. Alpha‐tocopherol showed an important protective role against drought stress in Yousof cultivar as a relatively drought‐tolerant cultivar.
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Claims 9
Claim · model-written summary
Drought decreased chlorophylls, beta-carotene, stomatal conductance and CO2 assimilation in both barley genotypes.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- drought stresse0
- Outcome
- chlorophylls, β‐carotene and stomatal conductancee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In both genotypes, drought stress led to decrease in chlorophylls, β‐carotene and stomatal conductance accompanied by decrease in CO 2 assimilation rate”
e1“photosynthesis in barley”
Claim · model-written summary
Drought significantly increased alpha-tocopherol only in Yousof.
- Taxon
- barleyHordeum vulgaree1
- Material
- Yousofe0
- Treatment
- drought stresse0
- Outcome
- α ‐ tochoperol contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant increase in α ‐ tochoperol content was only observed in Yousof cultivar under drought stress”
e1“barley genotypes”
Claim · model-written summary
Drought affected CO2 response and fluorescence parameters, more in Morocco than Yousof.
- Taxon
- barleyHordeum vulgaree1
- Material
- Moroccoe0
- Treatment
- drought stresse0
- Outcome
- Initial slope and plateau phase of CO 2 response curvee0
- Comparator
- Yousofe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initial slope and plateau phase of CO 2 response curve of drought‐stressed plants as well as polyphasic chlorophyll a fluorescence transient curve ( OJIP test) and fast fluorescence induction kinetics were influenced by drought stress. These parameters were more affected in Morocco cultivar by drought stress compare with Yousof”
e1“barley genotypes”
Claim · model-written summary
Drought reduced D1 protein content in both genotypes.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Drought stresse0
- Gene
- D1 proteine0
- Outcome
- D1 protein contente0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress also resulted in reduction of D1 protein content in both genotypes”
e1“barley genotypes”
Claim · model-written summary
Drought accelerated photoinhibition in both genotypes.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Drought stresse0
- Outcome
- photoinhibition processe0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress also resulted in reduction of D1 protein content in both genotypes and accelerated photoinhibition process”
e1“barley genotypes”
Claim · model-written summary
Authors identify stomatal conductance as the main limit on Yousof photosynthesis under mild drought.
- Taxon
- barleyHordeum vulgaree1
- Material
- Yousofe0
- Treatment
- mild drought stresse0
- Outcome
- photosynthesise0
- Qualifier
- stomatal conductancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance is the main factor limiting photosynthesis in Yousof genotype under mild drought stress”
e1“barley genotypes”
Claim · model-written summary
Authors identify PSII damage, lower electron transport and carboxylation efficiencies alongside stomatal limitation in Morocco.
- Taxon
- barleyHordeum vulgaree1
- Material
- Moroccoe0
- Outcome
- photosynthesise0
- Qualifier
- damage to photosystem II ( PSII ), reduced electron transport and carboxylation efficienciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Morocco, in addition to stomatal limitation, damage to photosystem II ( PSII ), reduced electron transport and carboxylation efficiencies were important parts of limitation in photosynthesis”
e1“barley genotypes”
Claim · model-written summary
Severe drought impaired light-dependent reactions and carboxylation in both genotypes.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Severe drought stresse0
- Outcome
- light‐dependent reactions as well as carboxylation process of photosynthesise0
- Direction
- impairmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe drought stress resulted in structural and biochemical impairment of light‐dependent reactions as well as carboxylation process of photosynthesis in both genotypes”
e1“barley genotypes”
Claim · model-written summary
Authors attribute a protective drought role to alpha-tocopherol in Yousof.
- Taxon
- barleyHordeum vulgaree1
- Material
- Yousofe0
- Compound
- Alpha‐tocopherole0
- Outcome
- protective role against drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alpha‐tocopherol showed an important protective role against drought stress in Yousof cultivar”
e1“barley genotypes”
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