Abstract
Diurnal changes in the photosynthesis and respiration of nine forage crops were determined under two different temperature levels, 15 and 30°C, enviromental factors including light intensity being kept constant. The followin results were obtained : 1). Under both temperatures, two types were observed of the diurnal changes in photosynthetic activity, one of which did not show any change throughout day and night and the other showed some decrease during the night hours. In any species, so-called "midday depression" was not seen. 2). The changes in photosynthesic activity, if they did occur, took place at the same time, though they failed in most cases to show the ordinary, clear-cut pattern of diurnal changes. 3). Depending on species, the following three groups were distinguished of the eflect of temperature on diurnal changes in photosynthesis : (a). Those, such as Italian ryegrass, red clover, orchard grass and rye, non-sensitive both to temperature levels and to other conditions, remaining unchanged in their photosynthesis throughout day and night. (b). Those, such as Dallisgrass, Sudangrass and new sorgo, sensitive to temperature, showing little change in photosynthesis when the temperature level fell within the optimum temperature range for their photosynthesis, but showing depression in photosynthesis, when the temperature level fell beyond the optimum range. (c). Those, such as teosinte and common vetch, more sensitive to some factors other than temperature level, showing depression in photosynthesis during the night hours under both temperature levels. 4). In all species tested, respiration under both temperature levels. showed a gradual decrease as time passed by.
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Claims 8
Claim · model-written summary
Midday depression in photosynthesis was not seen in any forage species tested.
Not reportedDirection
Verbatim
e0“Diurnal changes in the photosynthesis and respiration of nine forage crops”
e1“In any species, so-called "midday depression" was not seen”
Claim · model-written summary
Where changes in photosynthesis occurred, they took place at the same time but usually lacked a clear-cut diurnal pattern.
Not reportedDirection
Verbatim
e0“Diurnal changes in the photosynthesis and respiration of nine forage crops”
e1“The changes in photosynthesic activity, if they did occur, took place at the same time”
Claim · model-written summary
Under both temperatures, one type of diurnal photosynthetic change showed no change and the other showed some decrease during night hours.
Not reportedDirection
Verbatim
e0“Diurnal changes in the photosynthesis and respiration of nine forage crops”
e2“Under both temperatures, two types were observed of the diurnal changes in photosynthetic activity, one of which did not show any change throughout day and night and the other showed some decrease during the night hours”
Claim · model-written summary
Italian ryegrass, red clover and orchard grass remained unchanged in photosynthesis throughout day and night and were non-sensitive to temperature.
- Taxon
- Italian ryegrass, red clover, orchard grass
.jpg?width=60)
Dactylis glomerata
Lolium multiflorum
Trifolium pratensee3 - Outcome
- photosynthesise3
- Direction
- unchangede3
- Qualifier
- non-sensitive both to temperature levels and to other conditionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e3“Those, such as Italian ryegrass, red clover, orchard grass and rye, non-sensitive both to temperature levels and to other conditions, remaining unchanged in their photosynthesis throughout day and night”
Claim · model-written summary
Rye remained unchanged in photosynthesis throughout day and night and was non-sensitive to temperature.
- Taxon
- rye
Secale cerealee3 - Outcome
- photosynthesise3
- Direction
- unchangede3
- Qualifier
- non-sensitive both to temperature levels and to other conditionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Those, such as Italian ryegrass, red clover, orchard grass and rye, non-sensitive both to temperature levels and to other conditions, remaining unchanged in their photosynthesis throughout day and night”
Claim · model-written summary
Dallisgrass, Sudangrass and new sorgo showed depression in photosynthesis when the temperature level fell beyond their optimum range, with little change within it.
Verbatim
e4“Those, such as Dallisgrass, Sudangrass and new sorgo, sensitive to temperature, showing little change in photosynthesis when the temperature level fell within the optimum temperature range for their photosynthesis, but showing depression in photosynthesis, when the temperature level fell beyond the optimum range”
Claim · model-written summary
Teosinte and common vetch showed depression in photosynthesis during night hours under both temperature levels.
Verbatim
e5“Those, such as teosinte and common vetch, more sensitive to some factors other than temperature level, showing depression in photosynthesis during the night hours under both temperature levels”
Claim · model-written summary
Respiration of the forage crops showed a gradual decrease as time passed under both temperature levels.
Verbatim
e0“Diurnal changes in the photosynthesis and respiration of nine forage crops”
e6“In all species tested, respiration under both temperature levels. showed a gradual decrease as time passed by”