Abstract
Lipoxidase, in the cotyledons of squash (Cucurbita moscata) seedlings grown in the dark, reached its peak activity on the fifth day and then declined to its lowest activity on the eighth day. Under continuous irradiation, the rate of enzyme disappearance was accelerated by red (655 mmu) and was retarded by far-red (735 mmu) radiation. Acceleration of enzyme disappearance caused by red light was reversed repeatedly by far-red light in seedlings that received an initial exposure to red radiation. These responses were independent of the duration of irradiation at each of the alternating wavebands. No change was observed when the white light was administered either 24 hours before or 24 hours after the red, far-red treatment.The lipoxidase system of the seedlings given an initial exposure to far-red radiation also responded reversibly to alternating far-red, red extended exposures, but it failed to respond reversibly when short exposures were employed. Similarly, no change occurred in these seedlings when either pre- or post-treatment with the white light was applied.These results demonstrate that the capacity of lipoxidase to act reversibly depends primarily on the duration of exposure and on the kind of light (red or far-red) to which the seedlings were exposed initially. In spite of these variations, lipoxidase metabolism can be considered an additional biochemical manifestation of red, far-red reaction that operates in the photomorphogenesis of plants.
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Claims 10
Claim · model-written summary
In dark-grown squash seedlings, cotyledon lipoxidase activity peaked on the fifth day and was lowest on the eighth day.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e1“Lipoxidase, in the cotyledons of squash (Cucurbita moscata) seedlings grown in the dark, reached its peak activity on the fifth day and then declined to its lowest activity on the eighth day”
Claim · model-written summary
Under continuous irradiation, red light (655 mmu) accelerated the rate of lipoxidase enzyme disappearance in squash.
Not reportedComparator
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e3“Under continuous irradiation, the rate of enzyme disappearance was accelerated by red (655 mmu) and was retarded by far-red (735 mmu) radiation”
Claim · model-written summary
Under continuous irradiation, far-red light (735 mmu) retarded the rate of lipoxidase enzyme disappearance in squash.
Not reportedComparator
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e3“Under continuous irradiation, the rate of enzyme disappearance was accelerated by red (655 mmu) and was retarded by far-red (735 mmu) radiation”
Claim · model-written summary
Red-light acceleration of enzyme disappearance was repeatedly reversed by far-red light in squash seedlings given an initial red exposure.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e4“Acceleration of enzyme disappearance caused by red light was reversed repeatedly by far-red light in seedlings that received an initial exposure to red radiation”
Claim · model-written summary
The responses in squash were independent of the duration of irradiation at each of the alternating wavebands.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e5“These responses were independent of the duration of irradiation at each of the alternating wavebands”
Claim · model-written summary
The lipoxidase system of squash seedlings given an initial far-red exposure responded reversibly to alternating far-red and red extended exposures.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e6“The lipoxidase system of the seedlings given an initial exposure to far-red radiation also responded reversibly to alternating far-red, red extended exposures”
Claim · model-written summary
The lipoxidase system of squash seedlings given an initial far-red exposure failed to respond reversibly when short exposures were used.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e7“The lipoxidase system of the seedlings given an initial exposure to far-red radiation also responded reversibly to alternating far-red, red extended exposures, but it failed to respond reversibly when short exposures were employed”
Claim · model-written summary
White light given 24 hours before or after the red and far-red treatment caused no change in lipoxidase metabolism in squash.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e7“No change was observed when the white light was administered either 24 hours before or 24 hours after the red, far-red treatment”
Claim · model-written summary
Lipoxidase metabolism is an additional biochemical manifestation of the red, far-red reaction in photomorphogenesis of squash.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e6“lipoxidase metabolism can be considered an additional biochemical manifestation of red, far-red reaction that operates in the photomorphogenesis of plants”
Claim · model-written summary
The capacity of lipoxidase to act reversibly in squash depends primarily on the duration of exposure and on the kind of light.
Verbatim
t0“Lipoxidase Metabolism of Squash Seedlings”
e5“These results demonstrate that the capacity of lipoxidase to act reversibly depends primarily on the duration of exposure and on the kind of light (red or far-red) to which the seedlings were exposed initially”
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