Abstract
Differences in the photosynthetic activity and related leaf water balance were studied in eight rice varieties subjected to various levels of soil moisture tensions, i.e, flooded condition, values of 10, 20, 40 cbar and values at which leaf rolling began (50-62 cbar depending on the variety). The materials consisted of two lowland (IR 8 and Bosque), three tropical upland (Moroberekan, IAC 1246 and Batatais), two Japanese upland (Sensho and Rikuto Norin 24) and one dwarf mutant (Daikoku 1) varieties, respectively. The parameters observed were the photosynthetic rate (P), transpiration rate (T), leaf water potential (LWP), leaf diffusive conductance (1/r1) and leaf water content (W). The P decreased with the decrease in soil moisture with a concomitant decrease of T, LWP, 1/r1 and W, suggesting that the leaf water balance directly affects the P. Based on the responses of these parameters to soil-water stress, the material varieties were differentiated into four types. The lowland varieties performed high P and good leaf-water balance under fiooded condition. But they were very sensitive to the changes of the soil moisture, showing remarkable decreases of these parameters under moderate and severe drought. The tropical upland varieties showed rather low P under flooded condition, but they kept relatively good performance of P and leaf-water balance under moderate and severe drought conditions. The Japanese upland varieties showed intermediate values between the formers under flooded and moderate levels of the soil moisture tension (10-20 cbar), but under severe drought they showed sharp decrease of the values of these parameters as the lowland varieties did. The dwarf mu.tant Daikoku 1 performed comparatively high values of these parameters at every level of the soil moisture tension. The characteristics of these four types were discussed in view of their adaptation and plant-types.
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Claims 12
Claim · model-written summary
Photosynthetic rate decreased as soil moisture decreased.
- Taxon
- rice
Oryza sativat0 - Treatment
- decrease in soil moisturee0
- Outcome
- Pe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The P decreased with the decrease in soil moisture with a concomitant decrease of T, LWP, 1/r1 and W”
t0“rice”
Claim · model-written summary
Transpiration rate, leaf water potential and leaf diffusive conductance decreased with soil moisture.
- Taxon
- riceOryza sativat0
- Treatment
- decrease in soil moisturee0
- Outcome
- T, LWP, 1/r1e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The P decreased with the decrease in soil moisture with a concomitant decrease of T, LWP, 1/r1 and W”
t0“rice”
Claim · model-written summary
Leaf water content decreased with soil moisture.
- Taxon
- riceOryza sativat0
- Treatment
- decrease in soil moisturee0
- Outcome
- We0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The P decreased with the decrease in soil moisture with a concomitant decrease of T, LWP, 1/r1 and W”
t0“rice”
Claim · model-written summary
The authors suggest leaf water balance directly affects photosynthetic rate.
- Taxon
- riceOryza sativat0
- Outcome
- Pe0
- Qualifier
- leaf water balancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that the leaf water balance directly affects the P”
t0“rice”
Claim · model-written summary
Rice varieties were differentiated into four response types.
- Taxon
- riceOryza sativat0
- Outcome
- differentiated into four typese0
- Value
- foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on the responses of these parameters to soil-water stress, the material varieties were differentiated into four types.”
t0“rice”
Claim · model-written summary
Lowland varieties had high photosynthesis and good water balance under flooded conditions.
- Taxon
- riceOryza sativat0
- Material
- lowland varietiese0
- Outcome
- P and good leaf-water balancee0
- Direction
- highe0
- Qualifier
- under fiooded conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowland varieties performed high P and good leaf-water balance under fiooded condition.”
t0“rice”
Claim · model-written summary
Lowland varieties showed remarkable decreases in the parameters under moderate and severe drought.
- Taxon
- riceOryza sativat0
- Material
- lowland varietiese0
- Treatment
- moderate and severe droughte0
- Outcome
- these parameterse0
- Direction
- decreasese0
- Comparator
- fiooded conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowland varieties performed high P and good leaf-water balance under fiooded condition. But they were very sensitive to the changes of the soil moisture, showing remarkable decreases of these parameters under moderate and severe drought.”
t0“rice”
Claim · model-written summary
Tropical upland varieties showed low photosynthesis under flooded conditions.
- Taxon
- riceOryza sativat0
- Material
- tropical upland varietiese0
- Outcome
- Pe0
- Direction
- lowe0
- Qualifier
- under flooded conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tropical upland varieties showed rather low P under flooded condition”
t0“rice”
Claim · model-written summary
Tropical upland varieties maintained relatively good photosynthesis and water balance under moderate and severe drought.
- Taxon
- riceOryza sativat0
- Material
- tropical upland varietiese0
- Outcome
- performance of P and leaf-water balancee0
- Qualifier
- under moderate and severe drought conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tropical upland varieties showed rather low P under flooded condition, but they kept relatively good performance of P and leaf-water balance under moderate and severe drought conditions.”
t0“rice”
Claim · model-written summary
Japanese upland varieties had intermediate values under flooded and moderate moisture tensions.
- Taxon
- riceOryza sativat0
- Material
- Japanese upland varietiese0
- Outcome
- intermediate valuese0
- Qualifier
- under flooded and moderate levels of the soil moisture tension (10-20 cbar)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Japanese upland varieties showed intermediate values between the formers under flooded and moderate levels of the soil moisture tension (10-20 cbar)”
t0“rice”
Claim · model-written summary
Japanese upland varieties showed sharp decreases in parameter values under severe drought.
- Taxon
- riceOryza sativat0
- Material
- Japanese upland varietiese0
- Treatment
- severe droughte0
- Outcome
- values of these parameterse0
- Direction
- sharp decreasee0
- Comparator
- flooded and moderate levels of the soil moisture tensione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Japanese upland varieties showed intermediate values between the formers under flooded and moderate levels of the soil moisture tension (10-20 cbar), but under severe drought they showed sharp decrease of the values of these parameters as the lowland varieties did.”
t0“rice”
Claim · model-written summary
Daikoku 1 had comparatively high parameter values at every soil moisture tension.
- Taxon
- riceOryza sativat0
- Material
- Daikoku 1e0
- Outcome
- values of these parameterse0
- Direction
- comparatively highe0
- Qualifier
- at every level of the soil moisture tensione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dwarf mu.tant Daikoku 1 performed comparatively high values of these parameters at every level of the soil moisture tension.”
t0“rice”
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See all 12 papers →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.