Abstract
Abstract The classification of rice (Oryza sativa L.) cultivars according to their relative tillering ratio (RTR) shows promise as a means of identifying rice cultivars tolerant to P deficiency. Our objective was to determine if nutrient solution temperature and plant growth duration influenced RTR. Growing 12 genetically diverse rice cultivars in nutrient solution in the greenhouse and in the growth chamber at 25°C and 32°C and characterizing plants after 28, 32, and 40 days of growth showed that both growth duration and temperature influenced the RTR classification of more than half of the cultivars. Increasing growth duration from 28 to 32 to 40 days changed the P deficiency tolerance classification of 4 cultivars. The optimum days of growth was not evident. Increasing the nutrient solution temperature from 25°C to 32°C caused slight to major changes in the P deficiency tolerance classification of nine of the 12 cultivars. The Kanto 51 cultivar's classification changed from tolerant to susceptible to P deficiency as nutrient solution temperature increased. The optimun temperature for identifying P deficiency tolerant cultivars appears to be the mean temperature at which the cultivar will be grown commercially, suggesting that a cultivar's P deficiency tolerance classification may not be the same for the various rice growing areas in the world. Also, P deficient nutrient solutions increased the mean root length by as much as 55% and decreased root number by as much as 45% without having measurable influence on root weight. The increase in root length and decrease in root number was much more evident at 32°C than at 25°C and may be a mechanism by which rice plants escape P deficiency at higher temperatures.
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Claims 12
Claim · model-written summary
Growth duration influenced the RTR classification of P deficiency tolerance in more than half of the 12 rice cultivars.
- Taxon
- rice
Oryza sativae0 - Treatment
- growth duratione1
- Outcome
- RTR classificatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“both growth duration and temperature influenced the RTR classification of more than half of the cultivars”
Claim · model-written summary
Temperature influenced the RTR classification in more than half of the 12 rice cultivars.
- Taxon
- riceOryza sativae0
- Treatment
- temperaturee1
- Outcome
- RTR classificatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“both growth duration and temperature influenced the RTR classification of more than half of the cultivars”
Claim · model-written summary
Increasing growth duration from 28 to 40 days changed the P deficiency tolerance classification of 4 cultivars.
- Taxon
- riceOryza sativae0
- Treatment
- Increasing growth duration from 28 to 32 to 40 dayse1
- Outcome
- P deficiency tolerance classificatione1
- Value
- 4 cultivarse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“Increasing growth duration from 28 to 32 to 40 days changed the P deficiency tolerance classification of 4 cultivars”
Claim · model-written summary
No optimum growth duration was evident for the P deficiency tolerance classification of rice.
- Taxon
- riceOryza sativae0
- Outcome
- optimum days of growthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“The optimum days of growth was not evident”
Claim · model-written summary
Raising nutrient solution temperature from 25°C to 32°C caused slight to major changes in the P deficiency tolerance classification of nine of the 12 cultivars.
- Taxon
- riceOryza sativae0
- Treatment
- nutrient solution temperature from 25°C to 32°Ce1
- Outcome
- P deficiency tolerance classificatione1
- Value
- nine of the 12 cultivarse1
- Comparator
- 25°Ce1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“Increasing the nutrient solution temperature from 25°C to 32°C caused slight to major changes in the P deficiency tolerance classification of nine of the 12 cultivars”
Claim · model-written summary
The Kanto 51 rice cultivar changed from tolerant to susceptible to P deficiency as nutrient solution temperature increased.
- Taxon
- riceOryza sativae0
- Material
- Kanto 51e1
- Treatment
- nutrient solution temperaturee1
- Outcome
- classification changed from tolerant to susceptiblee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“The Kanto 51 cultivar's classification changed from tolerant to susceptible to P deficiency as nutrient solution temperature increased”
Claim · model-written summary
P deficient nutrient solutions increased the mean root length of rice by as much as 55%.
- Taxon
- riceOryza sativae0
- Treatment
- P deficient nutrient solutionse1
- Outcome
- mean root lengthe1
- Direction
- increasede1
- Value
- 55%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“P deficient nutrient solutions increased the mean root length by as much as 55% and decreased root number by as much as 45% without having measurable influence on root weight”
Claim · model-written summary
P deficient nutrient solutions decreased the root number of rice by as much as 45%.
- Taxon
- riceOryza sativae0
- Treatment
- P deficient nutrient solutionse1
- Outcome
- root numbere1
- Direction
- decreasede1
- Value
- 45%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“P deficient nutrient solutions increased the mean root length by as much as 55% and decreased root number by as much as 45% without having measurable influence on root weight”
Claim · model-written summary
The P-deficiency increase in root length and decrease in root number of rice were much more evident at 32°C than at 25°C.
- Taxon
- riceOryza sativae0
- Treatment
- 32°Ce1
- Outcome
- increase in root length and decrease in root numbere1
- Direction
- much more evidente1
- Comparator
- 25°Ce1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“The increase in root length and decrease in root number was much more evident at 32°C than at 25°C and may be a mechanism by which rice plants escape P deficiency at higher temperatures”
Claim · model-written summary
The increase in root length and decrease in root number may be a mechanism by which rice escapes P deficiency at higher temperatures.
- Taxon
- riceOryza sativae0
- Outcome
- escape P deficiencye0
- Qualifier
- increase in root length and decrease in root numbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in root length and decrease in root number was much more evident at 32°C than at 25°C and may be a mechanism by which rice plants escape P deficiency at higher temperatures”
Claim · model-written summary
P deficient nutrient solutions had no measurable influence on root weight.
- Taxon
- riceOryza sativae0
- Treatment
- P deficient nutrient solutionse1
- Outcome
- root weighte1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“P deficient nutrient solutions increased the mean root length by as much as 55% and decreased root number by as much as 45% without having measurable influence on root weight”
Claim · model-written summary
The optimum temperature for identifying P-deficiency tolerant rice cultivars appears to be the mean temperature at which each cultivar is grown commercially.
- Taxon
- riceOryza sativae0
- Outcome
- optimun temperature for identifying P deficiency tolerant cultivarse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“classification of rice (Oryza sativa L.) cultivars”
e1“optimun temperature for identifying P deficiency tolerant cultivars appears to be the mean temperature at which the cultivar will be grown commercially”
The same questions in other papers
fertilization · growth · Oryza sativa (rice)Positive and negative results
669 papers in the same direction as this paper · 81 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
755 papers more in this group
See all 759 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.