Abstract
Drought tolerance is an important crop characteristic for maintenance of productivity under water deficit conditions. Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied. Seeds were sown in a sandy soil. Irrigation was stopped in some plots 16 days after sowing and was continued in others. Stopping irrigation increased resistance to water flow to between 2- and 21-fold. However, it decreased the soil water potential by -0.004 to -12.7 MPa, the relative growth rate (RGR) by 15 to 27%, the net assimilation rate (NAR) by 17 to 34% and the photosynthetic rate by 16 to 45%, respectively. Pearl millet and sorghum, which were identified as drought tolerant, displayed the lowest reductions in RGR. RGR was predominantly limited by NAR in all crops. The photosynthetic rate was preponderantly limited by stomatal conductance. Stomatal conductance correlated with leaf xylem water potential significantly. Pearl millet and sourghum showed the highest leaf water status. Root systems of all crops reached 140 cm soil depth. Under water stress, total root length was significantly reduced in maize, was not affected in barnyard millet, and was significantly increased in sorghum and pearl millet. Drought toleranace in sorghum and pearl millet was assoicated with sustained water uptake ability by increasing total root length and maintenance of high leaf water status under soil drying conditions at the vegetative growth stage.
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Claims 15
Claim · model-written summary
Stopping irrigation increased resistance to water flow 2- to 21-fold across the four crops.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“Stopping irrigation increased resistance to water flow to between 2- and 21-fold”
Claim · model-written summary
Stopping irrigation decreased soil water potential by -0.004 to -12.7 MPa.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“decreased the soil water potential by -0.004 to -12.7 MPa”
Claim · model-written summary
Stopping irrigation decreased relative growth rate by 15 to 27 percent.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“the relative growth rate (RGR) by 15 to 27%”
Claim · model-written summary
Stopping irrigation decreased net assimilation rate by 17 to 34 percent.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“the net assimilation rate (NAR) by 17 to 34%”
Claim · model-written summary
Stopping irrigation decreased photosynthetic rate by 16 to 45 percent.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“the photosynthetic rate by 16 to 45%”
Claim · model-written summary
Pearl millet and sorghum, identified as drought tolerant, showed the lowest reductions in RGR under soil drying.
- Taxon
- Pearl millet and sorghum
Cenchrus americanus
Sorghume2 - Treatment
- Irrigation was stoppede1
- Outcome
- reductions in RGRe2
- Direction
- loweste2
- Comparator
- continued in otherse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“Pearl millet and sorghum, which were identified as drought tolerant, displayed the lowest reductions in RGR”
Claim · model-written summary
Relative growth rate was predominantly limited by net assimilation rate in all four crops.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e2“RGR was predominantly limited by NAR in all crops”
Claim · model-written summary
Photosynthetic rate was preponderantly limited by stomatal conductance in the crops.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e2“The photosynthetic rate was preponderantly limited by stomatal conductance”
Claim · model-written summary
Stomatal conductance correlated significantly with leaf xylem water potential.
- Taxon
- barnyard millet, maize, pearl millet and sorghume0
- Organ / stage
- leafe2
- Outcome
- Stomatal conductancee2
- Qualifier
- leaf xylem water potentiale2
Not reportedDirection
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e2“Stomatal conductance correlated with leaf xylem water potential significantly”
Claim · model-written summary
Pearl millet and sorghum showed the highest leaf water status.
Verbatim
e2“Pearl millet and sourghum showed the highest leaf water status”
Claim · model-written summary
Root systems of all four crops reached 140 cm soil depth.
Verbatim
e0“Interspecific differences among four gramineous crops (barnyard millet, maize, pearl millet and sorghum) in growth response to soil drying were studied”
e2“Root systems of all crops reached 140 cm soil depth”
Claim · model-written summary
Under water stress, total root length was significantly reduced in maize.
- Treatment
- Under water stresse2
- Outcome
- total root lengthe2
- Direction
- reducede2
- Comparator
- continued in otherse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“Under water stress, total root length was significantly reduced in maize”
Claim · model-written summary
Under water stress, total root length was not affected in barnyard millet.
Verbatim
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“Under water stress, total root length was significantly reduced in maize, was not affected in barnyard millet”
Claim · model-written summary
Under water stress, total root length was significantly increased in sorghum and pearl millet.
- Taxon
- sorghum and pearl milletCenchrus americanusSorghume2
- Treatment
- Under water stresse2
- Outcome
- total root lengthe2
- Direction
- increasede2
- Comparator
- continued in otherse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Irrigation was stopped in some plots 16 days after sowing and was continued in others”
e2“Under water stress, total root length was significantly reduced in maize, was not affected in barnyard millet, and was significantly increased in sorghum and pearl millet”
Claim · model-written summary
Drought tolerance in sorghum and pearl millet was associated with sustained water uptake through increased total root length and high leaf water status under soil drying at the vegetative stage.
- Taxon
- sorghum and pearl milletCenchrus americanusSorghume2
- Organ / stage
- vegetative growth stagee2
- Treatment
- soil dryinge2
- Outcome
- Drought toleranacee2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Drought toleranace in sorghum and pearl millet was assoicated with sustained water uptake ability by increasing total root length and maintenance of high leaf water status under soil drying conditions at the vegetative growth stage”
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See all 385 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.