Abstract
Lodgepole pine (Pinus contorta Dougl. var. latifolia) seedlings were grown for six weeks in a controlled environment using nutrient solutions containing 0.4, 4.0 or 8.0 meq/liter nitrate-N. Increased nitrate supply resulted in plants with smaller root/leaf weight ratios and higher moisture contents in the leaves. Increased nitrate also brought about decreases in the soluble carbohydrate and starch contents of the leaves and roots; these changes were associated with higher amino-N and insoluble protein contents, especially in the leaves, but lower soluble protein contents. The results support the hypothesis that increasing the nitrate supply altered the metabolism of the seedlings by increasing the competition for reductant in the plants.Drought survival was assessed by the extent of new root growth following a period of drought and recovery. Seedlings grown at the highest nitrate level had the lowest survival when the three treatments were held without watering for a two-week period. However, nitrate level altered drought survival less if the three treatments were stressed to the same final moisture content in the growth medium.
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Claims 7
Claim · model-written summary
Higher nitrate reduced root to leaf weight ratios.
- Taxon
- Lodgepole pine
Pinus contortat0 - Treatment
- Increased nitrate supplye0
- Outcome
- root/leaf weight ratiose0
- Direction
- smallere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased nitrate supply resulted in plants with smaller root/leaf weight ratios and higher moisture contents in the leaves”
t0“Lodgepole pine”
Claim · model-written summary
Higher nitrate increased leaf moisture content.
- Taxon
- Lodgepole pinePinus contortat0
- Treatment
- Increased nitrate supplye0
- Outcome
- moisture contents in the leavese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased nitrate supply resulted in plants with smaller root/leaf weight ratios and higher moisture contents in the leaves”
t0“Lodgepole pine”
Claim · model-written summary
Higher nitrate reduced soluble carbohydrate and starch in leaves and roots.
- Taxon
- Lodgepole pinePinus contortat0
- Treatment
- Increased nitratee0
- Outcome
- soluble carbohydrate and starch contents of the leaves and rootse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased nitrate also brought about decreases in the soluble carbohydrate and starch contents of the leaves and roots”
t0“Lodgepole pine”
Claim · model-written summary
Higher nitrate was associated with higher amino nitrogen and insoluble protein, especially in leaves.
- Taxon
- Lodgepole pinePinus contortat0
- Treatment
- Increased nitratet1
- Outcome
- amino-N and insoluble protein contentse0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these changes were associated with higher amino-N and insoluble protein contents, especially in the leaves”
t0“Lodgepole pine”
t1“Increased nitrate also brought about”
Claim · model-written summary
Higher nitrate was associated with lower soluble protein.
- Taxon
- Lodgepole pinePinus contortat0
- Treatment
- Increased nitratet1
- Outcome
- soluble protein contentse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but lower soluble protein contents”
t0“Lodgepole pine”
t1“Increased nitrate also brought about”
Claim · model-written summary
Highest nitrate gave lowest survival after two weeks without water.
- Taxon
- Lodgepole pinePinus contortat0
- Treatment
- highest nitrate levele0
- Outcome
- survivale0
- Direction
- loweste0
- Qualifier
- without watering for a two-week periode0
- Comparator
- three treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings grown at the highest nitrate level had the lowest survival when the three treatments were held without watering for a two-week period”
t0“Lodgepole pine”
Claim · model-written summary
Nitrate affected drought survival less when all treatments reached the same final medium moisture.
- Taxon
- Lodgepole pinePinus contortat0
- Treatment
- nitrate levele0
- Outcome
- drought survivale0
- Direction
- lesse0
- Qualifier
- same final moisture content in the growth mediume0
- Comparator
- three treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate level altered drought survival less if the three treatments were stressed to the same final moisture content in the growth medium”
t0“Lodgepole pine”
The same questions in other papers
nitrogen · survival · Pinus contorta (lodgepole pine)Positive and negative results
1 in the opposite direction
- positive
nitrogen · growth · Pinus contorta (lodgepole pine)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
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.