Abstract
The behavior of water stressed cotton ( Gossypium hirsutum L.) is well documented but our knowledge of traits which can be genetically manipulated to improve drought tolerance is incomplete. This study was conducted to determine which morphological and physiological factors lessen the effects of water stress on the yield of two short‐season cultivars [i.e., TAMCOT HQ95 (HQ95)and (G&P 74+ (GP74)] with a common parent in ancestry. Plants were grown in a rain shelter‐ lysimeter facility containing a Pedernales fine sandy loam soil (fine, mixed, thermic Udic Paleustalf)in 1990 and 1991 at Temple, TX. Water stress was imposed by replenishing a fraction of the water lost to evapotranspiration, beginning about 78 d after emergence. HQ95 and GP74 did not differ in leaf area index( LAI) or in the rate of leaf area development before water stress was imposed. The rate of LAI decline and average LAI were similar between cultivas when water stress was imposed. HQ95 used more water and used it at a faster rate than GP74 when water stressed. HQ95 produced more bolls and had higher yield under both well‐watered and water stressed conditions than GP74 in each of the 2 yr. The largest difference in boll load between cultivars occurred on sympodia branches in the lower canopy, where HQ95 had 37, 60, and 182% more bolls than GP74 when plants received 0, 50 or 75, and 100% of the depleted soil water. Whether well watered or water stressed, individual boll weight did not differ between the two cultivars. However, the harvest index and the production efficiency of bolls (i.e., bossl pr unit leaf area)of HQ95 was consistently higher than GP74 for all water regimes. On average, HQ95 located 21% more dry matter to yield and produced 32% more bolls per square meter than GP74. While differences in yield between the cultivars mirror harvest index, large differences in boll production efficiency suggested that the intrinsic photosynthetic capacity of HQ95 may be greater than GP74.
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Claims 12
Claim · model-written summary
HQ95 and GP74 did not differ in leaf area index or in the rate of leaf area development before water stress was imposed.
- Taxon
- Gossypium hirsutum L.
Gossypium hirsutume0 - Material
- HQ95 and GP74e1
- Outcome
- leaf area indexe1
- Qualifier
- before water stress was imposede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“HQ95 and GP74 did not differ in leaf area index( LAI) or in the rate of leaf area development before water stress was imposed”
Claim · model-written summary
The rate of LAI decline and average LAI were similar between the two cultivars when water stress was imposed.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Treatment
- water stresse1
- Outcome
- rate of LAI decline and average LAIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“The rate of LAI decline and average LAI were similar between cultivas when water stress was imposed”
Claim · model-written summary
HQ95 used more water than GP74 when water stressed, and used it at a faster rate.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Treatment
- water stressede1
- Outcome
- watere1
- Direction
- moree1
- Qualifier
- at a faster ratee1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“HQ95 used more water and used it at a faster rate than GP74 when water stressed”
Claim · model-written summary
HQ95 produced more bolls than GP74 under both well-watered and water-stressed conditions in each of the 2 years.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Treatment
- well‐watered and water stressed conditionse1
- Outcome
- bollse1
- Direction
- moree1
- Qualifier
- in each of the 2 yre1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“HQ95 produced more bolls and had higher yield under both well‐watered and water stressed conditions than GP74 in each of the 2 yr”
Claim · model-written summary
HQ95 had higher yield than GP74 under both well-watered and water-stressed conditions.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Treatment
- well‐watered and water stressed conditionse1
- Outcome
- yielde1
- Direction
- highere1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“HQ95 produced more bolls and had higher yield under both well‐watered and water stressed conditions than GP74 in each of the 2 yr”
Claim · model-written summary
The largest difference in boll load between cultivars was on sympodia branches in the lower canopy, where HQ95 had 37, 60 and 182% more bolls than GP74 at 0, 50 or 75, and 100% replacement of depleted soil water.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Treatment
- 0, 50 or 75, and 100% of the depleted soil watere1
- Outcome
- boll loade1
- Direction
- moree1
- Value
- 37, 60, and 182%e1
- Qualifier
- sympodia branches in the lower canopye1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“The largest difference in boll load between cultivars occurred on sympodia branches in the lower canopy, where HQ95 had 37, 60, and 182% more bolls than GP74 when plants received 0, 50 or 75, and 100% of the depleted soil water”
Claim · model-written summary
Individual boll weight did not differ between the two cultivars, whether well watered or water stressed.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Outcome
- individual boll weighte1
- Qualifier
- Whether well watered or water stressede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“Whether well watered or water stressed, individual boll weight did not differ between the two cultivars”
Claim · model-written summary
HQ95 had a consistently higher harvest index and boll production efficiency than GP74 across all water regimes.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Treatment
- all water regimese1
- Outcome
- harvest index and the production efficiency of bollse1
- Direction
- consistently highere1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“However, the harvest index and the production efficiency of bolls (i.e., bossl pr unit leaf area)of HQ95 was consistently higher than GP74 for all water regimes”
Claim · model-written summary
On average, HQ95 located 21% more dry matter to yield than GP74.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Outcome
- dry matter to yielde1
- Direction
- moree1
- Value
- 21%e1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“On average, HQ95 located 21% more dry matter to yield and produced 32% more bolls per square meter than GP74”
Claim · model-written summary
On average, HQ95 produced 32% more bolls per square meter than GP74.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Outcome
- bolls per square metere1
- Direction
- moree1
- Value
- 32%e1
- Comparator
- GP74e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“On average, HQ95 located 21% more dry matter to yield and produced 32% more bolls per square meter than GP74”
Claim · model-written summary
Differences in yield between the cultivars mirror their harvest index differences.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Outcome
- differences in yield between the cultivarse1
- Qualifier
- mirror harvest indexe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“While differences in yield between the cultivars mirror harvest index, large differences in boll production efficiency suggested that the intrinsic photosynthetic capacity of HQ95 may be greater than GP74”
Claim · model-written summary
Large differences in boll production efficiency suggest that the intrinsic photosynthetic capacity of HQ95 may be greater than that of GP74.
- Taxon
- Gossypium hirsutum L.Gossypium hirsutume0
- Material
- HQ95e1
- Outcome
- boll production efficiencye1
- Qualifier
- intrinsic photosynthetic capacitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stressed cotton ( Gossypium hirsutum L.)”
e1“While differences in yield between the cultivars mirror harvest index, large differences in boll production efficiency suggested that the intrinsic photosynthetic capacity of HQ95 may be greater than GP74”
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See all 399 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.