Abstract
Processing carrots are mainly grown under rain-fed conditions in Nova Scotia, and thus become vulnerable to frequent periods of drought. Prolonged drought results in significant reductions in the yield and quality of carrot crops. Resistance to water deficit is gene controlled and it is essential to identify the genotypes that withstand water stress. It is equally important to understand the physiological mechanism(s) that contribute to drought tolerance. Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse. Measurements were made on net photosynthesis, soil moisture, relative water content, membrane injury index, xylem pressure potential, and stem elongation. Overall, the slicer variety Bergen sustained normal plant functions under drought stress better than any of the other varieties. Bergen maintained stem elongation, photosynthetic activity, membrane function, and relative water content under droughted conditions. Another study was conducted to identify carrot varieties that are naturally resistant to drought. A mass screening of 85 slicer, dicer, and cut and peel varieties was conducted under greenhouse conditions. Two-week-old seedlings were exposed to gradual water deficit and observed for visual symptoms of wilting each day as soil moisture declined. Each variety was assigned a wilting score based upon the number of days it withstood drought (min = 1, max = 5). The dicer variety, Prodigy, was the only variety to score a 5 indicating the most drought resistance. Other varieties that withstood drought well were `Caropak', `Interceptor', `Oranza', and `Berlanda'. Varieties such as KC713126, Cello712113, and Cello711411 were more sensitive to water deficit and began to wilt 8 days after drought was imposed.
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Claims 7
Claim · model-written summary
Bergen maintained stem elongation, photosynthetic activity and membrane function under drought.
- Taxon
- carrot
Daucus carotae1 - Material
- Bergene3
- Treatment
- droughted conditionse3
- Outcome
- stem elongation, photosynthetic activity, membrane functione3
- Direction
- maintainede3
- Setting
- controlled greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e3“Bergen maintained stem elongation, photosynthetic activity, membrane function, and relative water content under droughted conditions”
Claim · model-written summary
Bergen maintained relative water content under drought.
- Taxon
- carrotDaucus carotae1
- Material
- Bergene3
- Treatment
- droughted conditionse3
- Outcome
- relative water contente3
- Direction
- maintainede3
- Setting
- controlled greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e3“Bergen maintained stem elongation, photosynthetic activity, membrane function, and relative water content under droughted conditions”
Claim · model-written summary
Bergen sustained normal plant functions under drought better than any other variety.
- Taxon
- carrotDaucus carotae1
- Material
- Bergene2
- Treatment
- drought stresse2
- Outcome
- normal plant functionse2
- Direction
- bettere2
- Comparator
- any of the other varietiese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e2“Overall, the slicer variety Bergen sustained normal plant functions under drought stress better than any of the other varieties”
Claim · model-written summary
The dicer variety Prodigy was the only variety to score the maximum drought resistance score of 5.
- Taxon
- carrotDaucus carotae1
- Material
- Prodigye4
- Outcome
- drought resistancee4
- Value
- 5e4
- Qualifier
- the only variety to score a 5e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e4“The dicer variety, Prodigy, was the only variety to score a 5 indicating the most drought resistance”
Claim · model-written summary
Caropak, Interceptor and Oranza withstood drought well in the greenhouse screen.
- Taxon
- carrotDaucus carotae1
- Material
- `Caropak', `Interceptor', `Oranza'e5
- Outcome
- withstood drought welle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e5“Other varieties that withstood drought well were `Caropak', `Interceptor', `Oranza', and `Berlanda'”
Claim · model-written summary
Berlanda withstood drought well in the greenhouse screen.
- Taxon
- carrotDaucus carotae1
- Material
- `Berlanda'e5
- Outcome
- withstood drought welle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e5“Other varieties that withstood drought well were `Caropak', `Interceptor', `Oranza', and `Berlanda'”
Claim · model-written summary
KC713126, Cello712113 and Cello711411 were more sensitive to water deficit and began to wilt 8 days after drought was imposed.
- Taxon
- carrotDaucus carotae1
- Material
- KC713126, Cello712113, and Cello711411e6
- Outcome
- more sensitive to water deficite6
- Value
- 8 dayse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Physiological measurements were made on eight carrot varieties exposed to natural drought in a controlled greenhouse”
e6“Varieties such as KC713126, Cello712113, and Cello711411 were more sensitive to water deficit and began to wilt 8 days after drought was imposed”
The same questions in other papers
drought · physiology: photosynthesis · Daucus carota (carrot)Results differ
3 in the opposite direction
- negative
- no effect
- negative
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.