Abstract
Cotyledonary senescence of Xanthium strumarium was delayed by removal of the supracotyledonary shoot, and this delay was accompanied by an increase in dry weight and surface area of cotyledons. Gibberellic acid (GA3) was found to enhance cotyledonary senescence and benzyladenine to retard it. Growth and senescence of cotyledons was completed in three successive stages-an initial phase when both dry weight and surface area increased, a second phase of dry weight decrease and surface area increase, and a third phase when dry weight decreased and cotyledons ceased to expand. Removal of the supracotyledonary shoot delayed the commencement of the second and third phases by at least 10 days. Relative amounts of chlorophyll, nucleic acid, and protein differed in cotyledons of normal seedlings and cotyledons of those seedlings in which supracotyledonary shoots had been removed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Removing the supracotyledonary shoot delayed cotyledon senescence.
- Taxon
- Xanthium strumarium
Xanthium strumariume0 - Treatment
- removal of the supracotyledonary shoote0
- Outcome
- Cotyledonary senescencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotyledonary senescence of Xanthium strumarium was delayed by removal of the supracotyledonary shoot”
Claim · model-written summary
Removing the shoot increased cotyledon dry weight and surface area.
- Taxon
- Xanthium strumariumXanthium strumariume2
- Treatment
- removal of the supracotyledonary shoote1
- Outcome
- dry weight and surface area of cotyledonse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this delay was accompanied by an increase in dry weight and surface area of cotyledons”
e1“removal of the supracotyledonary shoot”
e2“Xanthium strumarium”
Claim · model-written summary
Gibberellic acid enhanced cotyledon senescence.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Treatment
- Gibberellic acid (GA3)e0
- Outcome
- cotyledonary senescencee0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellic acid (GA3) was found to enhance cotyledonary senescence”
e1“Xanthium strumarium”
Claim · model-written summary
Benzyladenine retarded cotyledon senescence.
- Taxon
- Xanthium strumariumXanthium strumariume2
- Treatment
- benzyladeninee0
- Outcome
- cotyledonary senescencee1
- Direction
- retarde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“benzyladenine to retard it”
e1“cotyledonary senescence”
e2“Xanthium strumarium”
Claim · model-written summary
Cotyledon dry weight and surface area increased in the initial phase.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Organ / stage
- initial phasee0
- Outcome
- dry weight and surface areae0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an initial phase when both dry weight and surface area increased”
e1“Xanthium strumarium”
Claim · model-written summary
In the second phase, cotyledon dry weight decreased while surface area increased.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Organ / stage
- second phasee0
- Outcome
- dry weight decrease and surface area increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a second phase of dry weight decrease and surface area increase”
e1“Xanthium strumarium”
Claim · model-written summary
In the third phase, cotyledon dry weight decreased.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Organ / stage
- third phasee0
- Outcome
- dry weighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a third phase when dry weight decreased and cotyledons ceased to expand”
e1“Xanthium strumarium”
Claim · model-written summary
Cotyledons ceased to expand in the third phase.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Organ / stage
- third phasee0
- Outcome
- cotyledons ceased to expande0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a third phase when dry weight decreased and cotyledons ceased to expand”
e1“Xanthium strumarium”
Claim · model-written summary
Shoot removal delayed the second and third phases by at least 10 days.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Treatment
- Removal of the supracotyledonary shoote0
- Outcome
- commencement of the second and third phasese0
- Direction
- delayede0
- Value
- at least 10 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removal of the supracotyledonary shoot delayed the commencement of the second and third phases by at least 10 days”
e1“Xanthium strumarium”
Claim · model-written summary
Cotyledon chlorophyll, nucleic acid and protein amounts differed between intact and shoot-removed seedlings.
- Taxon
- Xanthium strumariumXanthium strumariume1
- Treatment
- supracotyledonary shoots had been removede0
- Outcome
- Relative amounts of chlorophyll, nucleic acid, and proteine0
- Comparator
- normal seedlingse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative amounts of chlorophyll, nucleic acid, and protein differed in cotyledons of normal seedlings and cotyledons of those seedlings in which supracotyledonary shoots had been removed”
e1“Xanthium strumarium”