Abstract
Drought is the one of the most important environmental stresses that reduces crop yield.Though wheat is C3plants,there is C4pathway photosynthetic enzymes,which playing an important role under drought stress particularly.To understand the effects of drought stress on C4pathway enzymes in wheat seedling leaves,two wheat varieties(Triticum aestivum L.)with different sensitivity to drought were chosen,and treated with 20% PEG in hydroponic experiment.The chlorophyll content,relative water content and the activity of C3and C4pathway enzymes in wheat seedling leaf were investigated at 0,6,12and 24hafter 20%PEG stress.The results showed that chlorophyll content,relative water content(RWC)and Rubisco activity(C3pathway key enzyme)all declined with the duration of PEG stress,and a larger reduction was observed in the drought sensitive variety Shaan 253.There was no significant difference in the activity of Rubisco declined(P0.05)between two cultivars at 6hafter stress,and then significant difference was observed(P0.05)along with the duration of stress,a reduction of 43.6%(P0.01)and 54.6%(P0.01)at 24hwas found in Xinong1043and Shaan 253,respectively.The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased.The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively.The increase of the activities of C4pathway enzymes in the leaves of Xinong 1043was more than that of Shaan 253.The results suggested that high activities of C4pathway enzymes might play an important role in photosynthetic carbon fixation and physiological mechanism of drought-resistant of wheat seedlings.
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Claims 14
Claim · model-written summary
Chlorophyll and relative water content fell with PEG stress duration, more in Shaan 253.
- Taxon
- wheat
Triticum aestivume1 - Material
- Shaan 253e0
- Outcome
- chlorophyll content,relative water content(RWC)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll content,relative water content(RWC)and Rubisco activity(C3pathway key enzyme)all declined with the duration of PEG stress,and a larger reduction was observed in the drought sensitive variety Shaan 253”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
Rubisco activity fell with PEG stress duration, more in Shaan 253.
- Taxon
- wheatTriticum aestivume1
- Material
- Shaan 253e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rubisco activity(C3pathway key enzyme)all declined with the duration of PEG stress,and a larger reduction was observed in the drought sensitive variety Shaan 253”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
Rubisco decline did not significantly differ between cultivars at 6 h, but differed later.
- Taxon
- wheatTriticum aestivume1
- Material
- two cultivarse0
- Outcome
- activity of Rubiscoe0
- Qualifier
- 6hafter stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant difference in the activity of Rubisco declined(P0.05)between two cultivars at 6hafter stress,and then significant difference was observed(P0.05)along with the duration of stress”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
Rubisco activity fell 43.6% in Xinong1043 at 24 h.
- Taxon
- wheatTriticum aestivume1
- Material
- Xinong1043e0
- Treatment
- 20% PEGe2
- Gene
- Rubiscoe3
- Outcome
- Rubisco activitye3
- Direction
- reductione0
- Value
- 43.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction of 43.6%(P0.01)and 54.6%(P0.01)at 24hwas found in Xinong1043and Shaan 253,respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
Rubisco activity fell 54.6% in Shaan 253 at 24 h.
- Taxon
- wheatTriticum aestivume1
- Material
- Shaan 253e0
- Treatment
- 20% PEGe2
- Gene
- Rubiscoe3
- Outcome
- Rubisco activitye3
- Direction
- reductione0
- Value
- 54.6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction of 43.6%(P0.01)and 54.6%(P0.01)at 24hwas found in Xinong1043and Shaan 253,respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
C4 pathway enzyme activities rose and then fell with stress duration.
- Taxon
- wheatTriticum aestivume1
- Treatment
- stress timee0
- Outcome
- activities of C4pathway enzymese0
- Direction
- increased with the duration of stress time and then decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e6“duration of PEG stress”
Claim · model-written summary
CA activity increased maximally by 19.3%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- PEG stresse6
- Outcome
- activities of carbonic an-hydrase(CA)e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
PEPC activity increased maximally by 34.7%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- PEG stresse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
NADPMDH activity increased maximally by 52.3%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- PEG stresse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
NADP-ME activity increased maximally by 93.7%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- PEG stresse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
NAD-ME activity increased maximally by 56.6%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- PEG stresse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
PPDK activity increased maximally by 91.3%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- PEG stresse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
C4 enzyme activities increased more in Xinong 1043 than in Shaan 253.
- Taxon
- wheatTriticum aestivume1
- Material
- Xinong 1043e0
- Direction
- more thane0
- Comparator
- Shaan 253e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase of the activities of C4pathway enzymes in the leaves of Xinong 1043was more than that of Shaan 253”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
Claim · model-written summary
The authors suggest high C4 enzyme activity may support carbon fixation and drought resistance.
- Taxon
- wheatTriticum aestivume0e1
- Outcome
- photosynthetic carbon fixation and physiological mechanism of drought-resistante0
- Qualifier
- high activities of C4pathway enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high activities of C4pathway enzymes might play an important role in photosynthetic carbon fixation and physiological mechanism of drought-resistant of wheat seedlings”
e1“wheat seedling leaves”
e2“treated with 20% PEG”
e3“Rubisco activity(C3pathway key enzyme)”
e4“The maximum increase of the activities of carbonic an-hydrase(CA),phosphoenolpyruvate carboxylase(PEPC),NADP malic dehydrogenase(NADPMDH),NADP malic enzyme(NADP-ME),NAD malic enzyme(NAD-ME)and Pyruvate-Pi-dikinase(PPDK)was 19.3%(P0.05),34.7%(P0.05),52.3%(P0.01),93.7%(P0.01),56.6%(P0.01)and 91.3%(P0.01),respectively”
e5“The activities of C4pathway enzymes in the leaves increased with the duration of stress time and then decreased”
e6“duration of PEG stress”
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