Abstract
We measured the effects of five root temperatures (12, 18, 24, 30 and 36 °C) and five rates of nitrogen fertilization (0, 2.5, 7.5, 22.5 and 67.5 meq N∙L −1 ) on growth, development, nitrogen content and nitrate reductase activity of tomato plants (Lycopersicon esculentum Mill. ’Vendor’). The greatest root dry weight was obtained at 18 °C and 2.5 meq N∙L −1 and the highest shoot dry weight at 24 °C and 22.5 meq N∙L −1 . Total fruit weight was maximum at 24 °C and 2.5 meq N∙L −1 . High root temperatures and high levels of fertilization increased the number of aborted flowers and the nitrogen content of shoots, but reduced tomato yields. Nitrate reductase activity (NRA) was higher in leaves than in roots and with plants receiving 22.5 meq N∙L −1 as compared to 2.5 meq. NRA in roots decreased as temperature increased.Key words: Lycopersicon esculentum Mill., root zone temperature, nitrate reductase, nitrogen
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Claims 9
Claim · model-written summary
The greatest root dry weight was obtained at 18 °C and 2.5 meq N∙L −1.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- 18 °C and 2.5 meq N∙L −1e1
- Outcome
- root dry weighte1
- Direction
- greateste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e1“The greatest root dry weight was obtained at 18 °C and 2.5 meq N∙L −1”
Claim · model-written summary
The highest shoot dry weight was obtained at 24 °C and 22.5 meq N∙L −1.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 24 °C and 22.5 meq N∙L −1e2
- Outcome
- shoot dry weighte2
- Direction
- higheste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e2“the highest shoot dry weight at 24 °C and 22.5 meq N∙L −1”
Claim · model-written summary
Total fruit weight was maximum at 24 °C and 2.5 meq N∙L −1.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 24 °C and 2.5 meq N∙L −1e3
- Outcome
- Total fruit weighte3
- Direction
- maximume3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e3“Total fruit weight was maximum at 24 °C and 2.5 meq N∙L −1”
Claim · model-written summary
High root temperatures and high nitrogen fertilization increased the number of aborted flowers in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- High root temperatures and high levels of fertilizatione4
- Outcome
- number of aborted flowerse4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e4“High root temperatures and high levels of fertilization increased the number of aborted flowers and the nitrogen content of shoots, but reduced tomato yields”
Claim · model-written summary
High root temperatures and high nitrogen fertilization increased the nitrogen content of tomato shoots.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- High root temperatures and high levels of fertilizatione4
- Outcome
- nitrogen content of shootse4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e4“High root temperatures and high levels of fertilization increased the number of aborted flowers and the nitrogen content of shoots, but reduced tomato yields”
Claim · model-written summary
High root temperatures and high nitrogen fertilization reduced tomato yields.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- High root temperatures and high levels of fertilizatione4
- Outcome
- tomato yieldse4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e4“High root temperatures and high levels of fertilization increased the number of aborted flowers and the nitrogen content of shoots, but reduced tomato yields”
Claim · model-written summary
Nitrate reductase activity was higher in leaves than in roots.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese5
- Outcome
- Nitrate reductase activitye5
- Direction
- highere5
- Comparator
- rootse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e5“Nitrate reductase activity (NRA) was higher in leaves than in roots and with plants receiving 22.5 meq N∙L −1 as compared to 2.5 meq”
Claim · model-written summary
Nitrate reductase activity was higher with 22.5 meq N∙L −1 than with 2.5 meq N.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 22.5 meq N∙L −1e5
- Outcome
- Nitrate reductase activitye5
- Direction
- highere5
- Comparator
- 2.5 meqe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e5“Nitrate reductase activity (NRA) was higher in leaves than in roots and with plants receiving 22.5 meq N∙L −1 as compared to 2.5 meq”
Claim · model-written summary
Nitrate reductase activity in roots decreased as temperature increased.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- temperaturee6
- Outcome
- NRA in rootse6
- Direction
- decreasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants (Lycopersicon esculentum Mill. ’Vendor’)”
e6“NRA in roots decreased as temperature increased”
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