Abstract
Water is the most essential condition to plant life,but the water resource is becoming more and more shorter in the 21st century.Soybean,as one of the five major crops in the world,is mankind's important sources of high-quality protein and edible oil.However,soybean is sensitive to water deficit and the water requirement of soybean is relatively high.Soybean in Chinese all three main soybean planting regions often suffer from drought to some degree during its growth season.So,the drought-resistant breeding and drought-resistant culturing of soybeans has been paid high attention since 1980's.Photosynthesis is an important factor that determines soybean's yield.At present,the research on soybean's photosynthetic characteristic mainly concentrates on its relationship with the yield.But it is lacking in studies on soybean's photosynthetic physioecological responses to drought and rewatering,which is helpful for constructing a theoretic basis for drought-tolerance planting and high-efficiency water use of soybean.Field experiments were conducted with soybean(Glycine max,yudou 29),a mainly planted soybean variety in Henan Province to study the relationship between the leaves photosynthetic characters and other physioecological parameters under soil drying and rewatering treatments.Soil moisture was controlled by weighing method,and leave water potential was determined by HR-33T dew point microvolt thermometer.The diurnal course of leaf photosynthetic ratio and transpiration ratio of top fully spread leaves were determined by LI-6400 portable photosynthesis measure system in situ(begun at 8:00 a.m).Each treatment had 5 replicates.It was showed that the dawn water potential of soybean leaves under drying treatment decreases little in comparison with well-watered treatments(CK),when soil moisture was higher than 47% of FWC(field water capacity).But when soil moisture was below 47% of FWC,the leave water potential decreased rapidly,which appeared a significant threshold value reaction.The threshold value of soybean dawn leaves water potential was nearly-1.02 MPa.Below this threshold value,the leave water potential and net photosynthesis ratio dropped rapidly.On the third day,the soil moisture under drought treatment was 47%,leaf water potential of the treatment was 7% lower than that of the CK,transpiration ratio and net photosynthesis ratio were respectively 67% and 90% that of the CK,the WUE was 35% higher than that of the CK.Above results indicated that the transpiration of soybean is more sensitive to drought than photosynthesis.This proved that it was possible to save water and increase yield simultaneously for soybean by cultivating measure.After rewatering,the leave water status of soybean was improved,the net photosynthesis ratio and transpiration ratio increased linearly,and Gs also recovered quickly.The results showed that soybean have a fast-growing characteristic after removing stress.However,whether there is a lagging effect of rewatering on soybean physiological traits and how important it is need further research.
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Claims 14
Claim · model-written summary
Dawn leaf water potential under drying decreased little relative to well-watered control when soil moisture was above 47% of FWC.
- Taxon
- soybean
Glycine maxt0 - Treatment
- drying treatmente1
- Outcome
- dawn water potentiale1
- Direction
- decreases littlee1
- Qualifier
- when soil moisture was higher than 47% of FWCe2
- Comparator
- well-watered treatments(CK)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“the dawn water potential of soybean leaves under drying treatment decreases little in comparison with well-watered treatments(CK)”
e2“when soil moisture was higher than 47% of FWC”
Claim · model-written summary
Below 47% of FWC soil moisture, leaf water potential decreased rapidly, a significant threshold response.
- Taxon
- soybeanGlycine maxt0
- Treatment
- soil moisture was below 47% of FWCe2
- Outcome
- leave water potentiale3
- Direction
- decreased rapidlye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e2“when soil moisture was below 47% of FWC”
e3“the leave water potential decreased rapidly”
Claim · model-written summary
The threshold value of soybean dawn leaf water potential was nearly -1.02 MPa.
- Taxon
- soybeanGlycine maxt0
- Outcome
- threshold valuee3
- Value
- nearly-1.02 MPae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e3“The threshold value of soybean dawn leaves water potential was nearly-1.02 MPa”
Claim · model-written summary
Below the threshold value, leaf water potential and net photosynthesis ratio dropped rapidly.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Below this threshold valuee2
- Outcome
- the leave water potential and net photosynthesis ratioe1
- Direction
- dropped rapidlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“the leave water potential and net photosynthesis ratio dropped rapidly”
e2“Below this threshold value”
Claim · model-written summary
On day three under drought, leaf water potential was 7% lower than in the control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drought treatmente1
- Outcome
- leaf water potentiale2
- Direction
- lowere2
- Value
- 7%e2
- Qualifier
- soil moisture under drought treatment was 47%e1
- Comparator
- CKe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“On the third day,the soil moisture under drought treatment was 47%”
e2“leaf water potential of the treatment was 7% lower than that of the CK”
Claim · model-written summary
Under drought, transpiration ratio was 67% of the control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drought treatmente1
- Outcome
- transpiration ratioe2
- Direction
- lowerinferrede2
- Value
- 67%e2
- Comparator
- CKe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“On the third day,the soil moisture under drought treatment was 47%”
e2“transpiration ratio and net photosynthesis ratio were respectively 67% and 90% that of the CK”
Claim · model-written summary
Under drought, net photosynthesis ratio was 90% of the control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drought treatmente1
- Outcome
- net photosynthesis ratioe2
- Direction
- lowerinferrede2
- Value
- 90%e2
- Comparator
- CKe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“On the third day,the soil moisture under drought treatment was 47%”
e2“transpiration ratio and net photosynthesis ratio were respectively 67% and 90% that of the CK”
Claim · model-written summary
Under drought, water use efficiency was 35% higher than in the control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drought treatmente1
- Outcome
- WUEe7
- Direction
- highere7
- Value
- 35%e7
- Comparator
- CKe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“On the third day,the soil moisture under drought treatment was 47%”
e7“the WUE was 35% higher than that of the CK”
Claim · model-written summary
Transpiration of soybean is more sensitive to drought than photosynthesis.
- Taxon
- soybeanGlycine maxt0
- Treatment
- droughte3
- Outcome
- transpiratione3
- Comparator
- photosynthesise3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e3“the transpiration of soybean is more sensitive to drought than photosynthesis”
Claim · model-written summary
Soybean can save water and increase yield simultaneously through cultivation measures.
- Taxon
- soybeanGlycine maxt0
- Outcome
- save water and increase yielde1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“it was possible to save water and increase yield simultaneously for soybean by cultivating measure”
Claim · model-written summary
After rewatering, net photosynthesis ratio and transpiration ratio increased linearly.
- Taxon
- soybeanGlycine maxt0
- Treatment
- rewateringe1
- Outcome
- net photosynthesis ratio and transpiration ratioe2
- Direction
- increased linearlye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“After rewatering”
e2“the net photosynthesis ratio and transpiration ratio increased linearly”
Claim · model-written summary
After rewatering, stomatal conductance Gs recovered quickly.
- Taxon
- soybeanGlycine maxt0
- Treatment
- rewateringe1
- Outcome
- Gse2
- Direction
- recovered quicklye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“After rewatering”
e2“Gs also recovered quickly”
Claim · model-written summary
After rewatering, leaf water status of soybean improved.
- Taxon
- soybeanGlycine maxt0
- Treatment
- rewateringe1
- Outcome
- leave water statuse2
- Direction
- improvede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“After rewatering”
e2“the leave water status of soybean was improved”
Claim · model-written summary
Soybean has a fast-growing characteristic after stress is removed.
- Taxon
- soybeanGlycine maxt0
- Outcome
- fast-growing characteristic after removing stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effect of drought and rewatering on photosynthetic physioecological characteristics of soybean”
e1“soybean have a fast-growing characteristic after removing stress”
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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.