Abstract
In two hybrids of sorghum (Sorghum bicolor Moench.), C51 and C42, high nitrogen concentration (HN) increased net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E) of well watered (HW) plants. Water stressing (LW plants) resulted in low PN, gs, and E in both hybrids, but the values were still higher in HN plants as compared to low nitrogen-grown (LN) plants. Intercellular CO2 concentration (Ci) increased in droughted plants. This increase was much higher in LN plants as compared to HN plants. Instantaneous water use efficiency was lower in LN plants as a consequence of a greater effect of water stress on photosynthesis. Leaf water potential was reduced by water stress in all treatments. Analysis of chlorophyll a fluorescence at room temperature showed that photosystem 2 (PS2) was rather tolerant to the water stress imposed. Water stress caused a slight decrease in the efficiency of excitation capture by open PS2 reaction centres (Fv/Fm). The in vivo quantum yield of PS2 photochemistry (ΦPS2) and the photochemical quenching coefficient (qP) were slightly reduced, while the nonphotochemical quenching coefficient (qN) was increased under the water stress. However, in hybrid C42 these characters were little or not affected by the water stress.
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Claims 12
Claim · model-written summary
High nitrogen increased net photosynthetic rate, stomatal conductance and transpiration of well-watered sorghum.
- Material
- C51 and C42e0
- Treatment
- high nitrogen concentratione0
- Outcome
- net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E)e0
- Direction
- increasede0
- Qualifier
- well watered (HW) plantse0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e0“In two hybrids of sorghum (Sorghum bicolor Moench.), C51 and C42, high nitrogen concentration (HN) increased net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E) of well watered (HW) plants”
Claim · model-written summary
Water stress resulted in low net photosynthetic rate, stomatal conductance and transpiration in both sorghum hybrids.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e1“Water stressing (LW plants) resulted in low PN, gs, and E in both hybrids”
Claim · model-written summary
Under water stress, photosynthesis and transpiration values were still higher in high-nitrogen sorghum plants than in low-nitrogen plants.
- Treatment
- HN plantse2
- Outcome
- valuese2
- Direction
- still highere2
- Comparator
- low nitrogen-grown (LN) plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e2“but the values were still higher in HN plants as compared to low nitrogen-grown (LN) plants”
Claim · model-written summary
Water stress increased intercellular CO2 concentration in sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e3“Intercellular CO2 concentration (Ci) increased in droughted plants”
Claim · model-written summary
The increase in intercellular CO2 under drought was much higher in low-nitrogen than in high-nitrogen sorghum plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e4“This increase was much higher in LN plants as compared to HN plants”
Claim · model-written summary
Instantaneous water use efficiency was lower in low-nitrogen sorghum plants.
- Treatment
- LN plantse5
- Outcome
- Instantaneous water use efficiencye5
- Direction
- lowere5
- Qualifier
- as a consequence of a greater effect of water stress on photosynthesise5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e5“Instantaneous water use efficiency was lower in LN plants as a consequence of a greater effect of water stress on photosynthesis”
Claim · model-written summary
Water stress reduced leaf water potential in sorghum in all treatments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e6“Leaf water potential was reduced by water stress in all treatments”
Claim · model-written summary
Photosystem 2 in sorghum was rather tolerant to the imposed water stress.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e7“photosystem 2 (PS2) was rather tolerant to the water stress imposed”
Claim · model-written summary
Water stress caused a slight decrease in the efficiency of excitation capture by open PS2 reaction centres (Fv/Fm) in sorghum.
- Treatment
- Water stresse1
- Outcome
- efficiency of excitation capture by open PS2 reaction centres (Fv/Fm)e1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e1“Water stress caused a slight decrease in the efficiency of excitation capture by open PS2 reaction centres (Fv/Fm)”
Claim · model-written summary
Water stress slightly reduced the in vivo quantum yield of PS2 photochemistry (ΦPS2) and the photochemical quenching coefficient (qP) in sorghum.
- Treatment
- Water stresse1
- Outcome
- quantum yield of PS2 photochemistry (ΦPS2) and the photochemical quenching coefficient (qP)e2
- Direction
- slightly reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e1“Water stress caused a slight decrease in the efficiency of excitation capture by open PS2 reaction centres (Fv/Fm)”
e2“The in vivo quantum yield of PS2 photochemistry (ΦPS2) and the photochemical quenching coefficient (qP) were slightly reduced”
Claim · model-written summary
Water stress increased the nonphotochemical quenching coefficient (qN) in sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e1“while the nonphotochemical quenching coefficient (qN) was increased under the water stress”
Claim · model-written summary
In hybrid C42 the chlorophyll fluorescence characters were little or not affected by water stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Two Hybrids of Sorghum”
e1“However, in hybrid C42 these characters were little or not affected by the water stress”
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See all 23 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.