Abstract
In order to study the adaptability to high temperature in ripening periods, following experiments were carried out. (1) Thirty varieties of lowland rice were cultivated in early and late season, and the daily process of kernel development, carbohydrate contents in leaves and culms, parcentages of partially-chalky kernels and milk-white kernels, and thickness of bran layer were investigated. In the ripening periods, the max. temperature or min. temp. was 28∼36°C or 21∼261°C in early cultivation, while in late cultivation it was 25∼32°C or 19∼24°C respectively. (2) Three varieties were treated in an air-conditioned room with night temperature of 30°C and 23°C through out the ripening periods (AH, AL) or for 10 days after heading (H, L), and investigations were done as in (1). The results are summarized as follows: 1. High temp. accelerated the kernel development and maturation. The maturation was too fast to be fully filled up by carbohydrate, so that the considerable amount of carbohydrate remained in leaves and culms. This tendency to prematurity caused the occurence of partially-chalky kernels and milk-white kernels and the increase of thickness of bran layer and also of layer of aleurone cells. 2. These facts came out remarkably in some varieties but did not in other varieties, on account of the varietal difference in adaptability to high temperature in ripening periods, for instance, variety Ou-225 was affected scarcely when night temperature was 25∼26°C but fairly affected at 30°C, whereas, variety Fujisaka-5 was affected to greater extent at 25∼26°C and severely at 30°C.
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Claims 8
Claim · model-written summary
High temperature accelerated rice kernel development and maturation.
- Taxon
- rice
Oryza sativat0 - Treatment
- High temp.e0
- Outcome
- kernel development and maturatione0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temp. accelerated the kernel development and maturation.”
t0“Rice”
Claim · model-written summary
Carbohydrate remained in rice leaves and culms after excessively rapid maturation.
- Taxon
- riceOryza sativat0
- Organ / stage
- leaves and culmse0
- Outcome
- considerable amount of carbohydrate remained in leaves and culmse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maturation was too fast to be fully filled up by carbohydrate, so that the considerable amount of carbohydrate remained in leaves and culms.”
t0“Rice”
Claim · model-written summary
Premature rice ripening caused partially-chalky and milk-white kernels.
- Taxon
- riceOryza sativat0
- Outcome
- occurence of partially-chalky kernels and milk-white kernelse0
- Qualifier
- tendency to prematuritye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This tendency to prematurity caused the occurence of partially-chalky kernels and milk-white kernels”
t0“Rice”
Claim · model-written summary
Premature rice ripening increased bran and aleurone layer thickness.
- Taxon
- riceOryza sativat0
- Outcome
- increase of thickness of bran layer and also of layer of aleurone cellse0
- Qualifier
- tendency to prematuritye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This tendency to prematurity caused the occurence of partially-chalky kernels and milk-white kernels and the increase of thickness of bran layer and also of layer of aleurone cells.”
t0“Rice”
Claim · model-written summary
Ou-225 was scarcely affected at 25∼26°C night temperature.
- Taxon
- riceOryza sativat0
- Material
- Ou-225e0
- Treatment
- night temperature was 25∼26°Ce0
- Outcome
- affected scarcelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variety Ou-225 was affected scarcely when night temperature was 25∼26°C”
t0“Rice”
Claim · model-written summary
Ou-225 was fairly affected at 30°C night temperature.
- Taxon
- riceOryza sativat0
- Material
- Ou-225e0
- Treatment
- 30°Ce0
- Outcome
- fairly affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variety Ou-225 was affected scarcely when night temperature was 25∼26°C but fairly affected at 30°C”
t0“Rice”
Claim · model-written summary
Fujisaka-5 was affected to a greater extent at 25∼26°C.
- Taxon
- riceOryza sativat0
- Material
- Fujisaka-5e0
- Treatment
- 25∼26°Ce0
- Outcome
- affected to greater extente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variety Fujisaka-5 was affected to greater extent at 25∼26°C”
t0“Rice”
Claim · model-written summary
Fujisaka-5 was severely affected at 30°C.
- Taxon
- riceOryza sativat0
- Material
- Fujisaka-5e0
- Treatment
- 30°Ce0
- Outcome
- severelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variety Fujisaka-5 was affected to greater extent at 25∼26°C and severely at 30°C”
t0“Rice”