Abstract
In order to ascertain the physiological roles of the hydrogen-ion concentration of nutrient medium and the intensity of daylight upon growth, yield, and chemical composition of rice plant, these experiments were carried out under the condition of water culture. Two varieties, namely "Kameno-o" and "Husaku sirazi" were cultured with two modiffed Kasigai's solutions, which were prepared to be kept at 3.1 and 5.8 pH values respectively. The nutrient solutions were renewed every other day, so that no significant change of pH values and of the chemcal forms of compounds would occure in the experiments. The pots, in which the materials were growing, were classfied into three groups and they were placed under the different conditions of solar radiation in the following plan. Three cubical wooden frames (2X3.7X3 m, ) were set on field; and two of them were covered with one or two laycrs of white cotton cloth and the other had no cover as control. The growth of plant was markedly affected by the difference of both by the reaction of the culture solutions and the light intensities. Under the conditions of decreasing light the plants apted to grow in elongation rapidly. ln some experiments, however in the strong acidic condition the light effect was marked, since growth was lirnited by hydrogen-ion concentration. The number of tillers increased directly proportional to the light intensity in the case of pH 5.8., but such a tendency was not clear in the higher acidity. Lowering the intensity to 0.65 of day light produced rather more dry matter of plant, but a further diminishing light intensity, made it to fell off considerablly. The yield of grains increased almost proportional to the amount of solar radiation in the case of pH 5.8 but in the higher acidity a reversible relation, even a slight, was found. Muchs sugars and starch were contained in the plants cultured with strong acidic solutions when the light was insufficiemt, while, they were less in the case of pH. 5.8. The amount of chlorophyll in leaves was directly proportional to the decreasing light intensities at both reaction of culture media within the limits of these experiments. In the slightly decreasring of light, carotine and xanthophyll increased exceptionally. A partial parallelism was found between the amount of nitrogen in plants and the decreasing of light intensity. Similar results were also obtained concernning to phosphorus and potassium, while less iron, on the contrary, was found, especially in the strong scidity of medium. From the fact above mentioned, it may be concluded that rice plants grow favorablly in the lack of solar radiations under the strong acidic conditions.
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Claims 19
Claim · model-written summary
Rice growth was markedly affected by culture solution reaction and light intensity.
- Taxon
- rice plant
Oryza sativae1 - Treatment
- reaction of the culture solutions and the light intensitiese0
- Outcome
- growth of plante0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of plant was markedly affected by the difference of both by the reaction of the culture solutions and the light intensities”
e1“chemical composition of rice plant”
Claim · model-written summary
Decreasing light rapidly elongated rice plants.
- Taxon
- rice plantOryza sativae1
- Treatment
- decreasing lighte0
- Outcome
- grow in elongatione0
- Direction
- rapidlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the conditions of decreasing light the plants apted to grow in elongation rapidly”
e1“chemical composition of rice plant”
Claim · model-written summary
Under strong acidity, hydrogen ion concentration limited growth and made the light effect marked.
- Taxon
- rice plantOryza sativae1
- Treatment
- strong acidic conditione0
- Outcome
- growthe0
- Direction
- lirnitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the strong acidic condition the light effect was marked, since growth was lirnited by hydrogen-ion concentration”
e1“chemical composition of rice plant”
Claim · model-written summary
At pH 5.8, tiller number increased in proportion to light intensity.
- Taxon
- rice plantOryza sativae1
- Treatment
- light intensitye0
- Outcome
- number of tillerse0
- Direction
- increasede0
- Qualifier
- pH 5.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of tillers increased directly proportional to the light intensity in the case of pH 5.8”
e1“chemical composition of rice plant”
Claim · model-written summary
The tiller versus light pattern was unclear under higher acidity.
- Taxon
- rice plantOryza sativae2
- Treatment
- light intensitye1
- Outcome
- number of tillerse1
- Qualifier
- higher aciditye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but such a tendency was not clear in the higher acidity”
e1“The number of tillers increased directly proportional to the light intensity in the case of pH 5.8”
e2“chemical composition of rice plant”
Claim · model-written summary
Light reduced to 0.65 of daylight produced more rice dry matter.
- Taxon
- rice plantOryza sativae1
- Treatment
- Lowering the intensity to 0.65 of day lighte0
- Outcome
- dry matter of plante0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lowering the intensity to 0.65 of day light produced rather more dry matter of plant”
e1“chemical composition of rice plant”
Claim · model-written summary
Further light reduction substantially decreased rice dry matter.
- Taxon
- rice plantOryza sativae2
- Treatment
- further diminishing light intensitye0
- Outcome
- dry matter of plante1
- Direction
- fell offe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a further diminishing light intensity, made it to fell off considerablly”
e1“dry matter of plant”
e2“chemical composition of rice plant”
Claim · model-written summary
At pH 5.8, grain yield increased almost in proportion to solar radiation.
- Taxon
- rice plantOryza sativae1
- Treatment
- amount of solar radiatione0
- Outcome
- yield of grainse0
- Direction
- increasede0
- Qualifier
- pH 5.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of grains increased almost proportional to the amount of solar radiation in the case of pH 5.8”
e1“chemical composition of rice plant”
Claim · model-written summary
Under higher acidity, grain yield showed a slight reverse relationship to solar radiation.
- Taxon
- rice plantOryza sativae2
- Treatment
- amount of solar radiatione1
- Outcome
- yield of grainse1
- Qualifier
- higher aciditye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the higher acidity a reversible relation, even a slight, was found”
e1“The yield of grains increased almost proportional to the amount of solar radiation”
e2“chemical composition of rice plant”
Claim · model-written summary
With insufficient light, strongly acidic solutions yielded much sugar in rice plants compared with pH 5.8.
- Taxon
- rice plantOryza sativae1
- Treatment
- strong acidic solutionse0
- Outcome
- sugarse0
- Direction
- Muchse0
- Qualifier
- light was insufficiemte0
- Comparator
- pH. 5.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Muchs sugars and starch were contained in the plants cultured with strong acidic solutions when the light was insufficiemt, while, they were less in the case of pH. 5.8”
e1“chemical composition of rice plant”
Claim · model-written summary
With insufficient light, strongly acidic solutions yielded much starch in rice plants compared with pH 5.8.
- Taxon
- rice plantOryza sativae1
- Treatment
- strong acidic solutionse0
- Outcome
- starche0
- Direction
- Muchse0
- Qualifier
- light was insufficiemte0
- Comparator
- pH. 5.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Muchs sugars and starch were contained in the plants cultured with strong acidic solutions when the light was insufficiemt, while, they were less in the case of pH. 5.8”
e1“chemical composition of rice plant”
Claim · model-written summary
Leaf chlorophyll increased in direct proportion to decreasing light intensity at both pH levels.
- Taxon
- rice plantOryza sativae1
- Treatment
- light intensitiese0
- Outcome
- amount of chlorophyll in leavese0
- Direction
- decreasinge0
- Qualifier
- both reaction of culture mediae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of chlorophyll in leaves was directly proportional to the decreasing light intensities at both reaction of culture media”
e1“chemical composition of rice plant”
Claim · model-written summary
Slightly reduced light increased carotine.
- Taxon
- rice plantOryza sativae1
- Treatment
- slightly decreasring of lighte0
- Outcome
- carotinee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the slightly decreasring of light, carotine and xanthophyll increased exceptionally”
e1“chemical composition of rice plant”
Claim · model-written summary
Slightly reduced light increased xanthophyll.
- Taxon
- rice plantOryza sativae1
- Treatment
- slightly decreasring of lighte0
- Outcome
- xanthophylle0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the slightly decreasring of light, carotine and xanthophyll increased exceptionally”
e1“chemical composition of rice plant”
Claim · model-written summary
Plant nitrogen partly tracked decreasing light intensity.
- Taxon
- rice plantOryza sativae1
- Treatment
- decreasing of light intensitye0
- Outcome
- amount of nitrogen in plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A partial parallelism was found between the amount of nitrogen in plants and the decreasing of light intensity”
e1“chemical composition of rice plant”
Claim · model-written summary
Plant phosphorus showed a similar relationship to decreasing light intensity.
- Taxon
- rice plantOryza sativae2
- Treatment
- decreasing of light intensitye1
- Outcome
- phosphoruse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar results were also obtained concernning to phosphorus and potassium”
e1“A partial parallelism was found between the amount of nitrogen in plants and the decreasing of light intensity”
e2“chemical composition of rice plant”
Claim · model-written summary
Plant potassium showed a similar relationship to decreasing light intensity.
- Taxon
- rice plantOryza sativae2
- Treatment
- decreasing of light intensitye1
- Outcome
- potassiume0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar results were also obtained concernning to phosphorus and potassium”
e1“A partial parallelism was found between the amount of nitrogen in plants and the decreasing of light intensity”
e2“chemical composition of rice plant”
Claim · model-written summary
Plant iron was lower with decreasing light, particularly in strongly acidic medium.
- Taxon
- rice plantOryza sativae2
- Treatment
- decreasing of light intensitye1
- Outcome
- irone0
- Direction
- lesse0
- Qualifier
- strong scidity of mediume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“less iron, on the contrary, was found, especially in the strong scidity of medium”
e1“decreasing of light intensity”
e2“chemical composition of rice plant”
Claim · model-written summary
The authors concluded that rice grows favorably with low solar radiation under strong acidity.
- Taxon
- rice plantsOryza sativae0
- Outcome
- grow favorabllye0
- Qualifier
- lack of solar radiations under the strong acidic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice plants grow favorablly in the lack of solar radiations under the strong acidic conditions”
The same questions in other papers
light · growth · Oryza sativa (rice)Positive and negative results
54 papers in the same direction as this paper · 38 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
- negative
91 papers more in this group
See all 95 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.