Abstract
Due to global climate change and poor drainage soil characteristic in paddy fields, soybeans which are one of main upland crops in Korea are prone to get stressed by excessive soil moisture during cultivation. Excessive soil moisture stress causes poor growth, yield loss, and disease to soybeans. In order to prevent damages by excessive soil moisture stress, it is important to understand responses of soybeans under excessive soil moisture condition. Therefore, this study investigated morphological and physiological responses of soybeans by excessive soil moisture at various growth stages; V2, R1, R3, R5 and whole growing period. Soybeans were planted and characteristics of photosynthesis, chlorophyll fluorescence and 1-Aminocyclopropane-1-carboxilic acid (ACC) were measured from leaves after excessive soil moisture treatment. After harvest, growth and yield components were measured. As a result, soybean showed the smallest stalk height from soybeans which had excessive soil moisture at V2 and whole growing period. On the other hand, the greatest yield loss occurred when excessive soil moisture applied at R5, while the smallest at R2 and whole growing period. Soybean leaves showed the smallest photosynthetic rate and stomatal conductance under excessive soil moisture condition. These decline continued at least 1 week and restored to the values of photosynthetic rate and stomatal conductance from soybeans with no stress. Soybeans under excessive soil moisture exhibited greater ACC values than one of no stress. These increment of ACC continued 2 weeks and diminished. Soybeans treated with excessive soil moisture at V2, R1, R3 and whole growing period had decrease in photosynthetic rate and increase in ACC values. These results can indicate that changes of ACC contents in soybean leaves may be used as indicator of excessive soil moisture stress.
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Claims 10
Claim · model-written summary
V2 and whole-period flooding yielded the shortest stalks.
- Taxon
- soybean
Glycine maxe0 - Treatment
- excessive soil moisture at V2 and whole growing periode0
- Outcome
- stalk heighte0
- Direction
- smalleste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean showed the smallest stalk height from soybeans which had excessive soil moisture at V2 and whole growing period”
Claim · model-written summary
R5 moisture stress caused the greatest yield loss.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- excessive soil moisture applied at R5e0
- Outcome
- yield losse0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the greatest yield loss occurred when excessive soil moisture applied at R5”
t0“Soybean”
Claim · model-written summary
Yield loss was smallest at R2 and whole-period treatment.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- smalleste0
- Direction
- smalleste0
- Qualifier
- R2 and whole growing periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while the smallest at R2 and whole growing period”
t0“Soybean”
Claim · model-written summary
Excess moisture lowered leaf photosynthetic rate and stomatal conductance.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- excessive soil moisture conditione0
- Outcome
- photosynthetic rate and stomatal conductancee0
- Direction
- smalleste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean leaves showed the smallest photosynthetic rate and stomatal conductance under excessive soil moisture condition.”
Claim · model-written summary
Photosynthetic rate and conductance recovered after at least a week.
- Taxon
- soybeansGlycine maxe0
- Outcome
- photosynthetic rate and stomatal conductancee0
- Direction
- restorede0
- Comparator
- soybeans with no stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These decline continued at least 1 week and restored to the values of photosynthetic rate and stomatal conductance from soybeans with no stress.”
Claim · model-written summary
Excess moisture raised leaf ACC values relative to unstressed soybeans.
- Taxon
- SoybeansGlycine maxe0
- Treatment
- excessive soil moisturee0
- Outcome
- ACC valuese0
- Direction
- greatere0
- Comparator
- one of no stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybeans under excessive soil moisture exhibited greater ACC values than one of no stress.”
Claim · model-written summary
ACC elevation lasted two weeks then diminished.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- ACCe0
- Direction
- diminishede0
- Value
- 2 weekse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These increment of ACC continued 2 weeks and diminished.”
t0“Soybean”
Claim · model-written summary
Moisture at V2, R1, R3 and throughout growth lowered photosynthesis.
- Taxon
- SoybeansGlycine maxe0
- Treatment
- excessive soil moisture at V2, R1, R3 and whole growing periode0
- Outcome
- photosynthetic ratee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybeans treated with excessive soil moisture at V2, R1, R3 and whole growing period had decrease in photosynthetic rate and increase in ACC values.”
Claim · model-written summary
Moisture at V2, R1, R3 and throughout growth raised ACC.
- Taxon
- SoybeansGlycine maxe0
- Treatment
- excessive soil moisture at V2, R1, R3 and whole growing periode0
- Outcome
- ACC valuese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybeans treated with excessive soil moisture at V2, R1, R3 and whole growing period had decrease in photosynthetic rate and increase in ACC values.”
Claim · model-written summary
The authors propose leaf ACC content as an excess moisture indicator.
- Taxon
- soybeanGlycine maxe0
- Outcome
- indicator of excessive soil moisture stresse0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changes of ACC contents in soybean leaves may be used as indicator of excessive soil moisture stress”
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