Abstract
Changes of growth patterns with age in Pharbitis seedlings have been investigated in relation to the appearance of photoperiodic sensitivity.1. Dark-grown seedlings become sensitive to a single inductive dark period a definite number of hours after transfer to light, and the light period required to obtain this photoperiodic sensitivity decreases with an increasing duration of the growth of the seedling in the dark at the beginning of germination.2. The appearance of the photoperiodic sensitivity coincides in time with a change in the dry weight of the cotyledons and with tissue differentiation in them. At this time the dry weight ceases to decrease and begins to increase. In the stage at which the growth of hypocotyl ceases and that of the plumules becomes predominant the plant attains photoperiodic sensitivity.
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Claims 6
Claim · model-written summary
Dark-grown Pharbitis nil seedlings become sensitive to a single inductive dark period a definite number of hours after transfer to light.
- Taxon
- Pharbitis Nil
Ipomoea nilt0 - Organ / stage
- Dark-grown seedlingse1
- Outcome
- sensitive to a single inductive dark periode1
- Qualifier
- a definite number of hours after transfer to lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pharbitis Nil”
e1“Dark-grown seedlings become sensitive to a single inductive dark period a definite number of hours after transfer to light”
Claim · model-written summary
The light period required for photoperiodic sensitivity decreases as the duration of growth in the dark increases.
- Taxon
- Pharbitis NilIpomoea nilt0
- Treatment
- duration of the growth of the seedling in the darke2
- Outcome
- light period required to obtain this photoperiodic sensitivitye2
- Direction
- decreasese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pharbitis Nil”
e2“the light period required to obtain this photoperiodic sensitivity decreases with an increasing duration of the growth of the seedling in the dark at the beginning of germination”
Claim · model-written summary
The appearance of photoperiodic sensitivity coincides in time with a change in the dry weight of the cotyledons.
- Taxon
- Pharbitis NilIpomoea nilt0
- Organ / stage
- cotyledonse3
- Outcome
- a change in the dry weight of the cotyledonse3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pharbitis Nil”
e3“The appearance of the photoperiodic sensitivity coincides in time with a change in the dry weight of the cotyledons and with tissue differentiation in them”
Claim · model-written summary
The appearance of photoperiodic sensitivity coincides in time with tissue differentiation in the cotyledons.
- Taxon
- Pharbitis NilIpomoea nilt0
- Organ / stage
- cotyledonse3
- Outcome
- tissue differentiatione3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pharbitis Nil”
e3“The appearance of the photoperiodic sensitivity coincides in time with a change in the dry weight of the cotyledons and with tissue differentiation in them”
Claim · model-written summary
At the time photoperiodic sensitivity appears, the dry weight of the cotyledons stops decreasing and begins to increase.
- Taxon
- Pharbitis NilIpomoea nilt0
- Organ / stage
- cotyledonse3
- Outcome
- dry weighte4
- Direction
- begins to increasee4
- Qualifier
- ceases to decreasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pharbitis Nil”
e3“The appearance of the photoperiodic sensitivity coincides in time with a change in the dry weight of the cotyledons and with tissue differentiation in them”
e4“At this time the dry weight ceases to decrease and begins to increase”
Claim · model-written summary
Photoperiodic sensitivity is attained when hypocotyl growth ceases and plumule growth becomes predominant.
- Taxon
- Pharbitis NilIpomoea nilt0
- Organ / stage
- plumulese5
- Outcome
- photoperiodic sensitivitye5
- Qualifier
- growth of hypocotyl ceasese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pharbitis Nil”
e5“In the stage at which the growth of hypocotyl ceases and that of the plumules becomes predominant the plant attains photoperiodic sensitivity”