Abstract
Experiments were conducted to determine the influence of seedling organs on lateral root development in Pisum sativum `Alaska.' The cotyledons, root tip, and epicotyl were excised from seedlings containing roots of less than 3 cm. In some cases, plant growth regulators or nutritional factors were substituted for the excised organs. The number of emerged and initiated lateral roots was counted after 7 days. Cotyledon removal completely inhibited lateral root emergence and reduced the total number of initiated laterals by 40%. Cotyledon removal did not alter the number of laterals initiated per cm of primary root. Epicotyl removal reduced the number of emerged lateral roots but not the total number initiated. Root tip removal slightly increased the total number of lateral roots formed and emerged from the root region remaining after tip excision. Sucrose, nicotinic acid, pyridoxine, and thiamine did not promote lateral root emergence when provided as cotyledon substitutes. Growth regulator substitutions for either the cotyledons or the root tip mimicked the substituted organs. High auxin (10-4 M indolylacetic acid) promoted lateral root initiation and emergence when it was a cotyledon substitute. High cytokinin (10-4 M 6-benzylaminopurine) inhibited lateral root initiation and emergence when supplied as a root tip substitute. Evidence is provided in support of the hypothesis that the cotyledons and root tip act together to establish auxin and cytokinin concentrations along the primary root axis to control lateral root initiation and emergence.
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Claims 12
Claim · model-written summary
Cotyledon removal completely inhibited lateral root emergence in pea seedlings.
- Taxon
- Pisum sativum
Lathyrus oleraceuse1 - Treatment
- Cotyledon removale2
- Outcome
- lateral root emergencee2
- Direction
- inhibitede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Cotyledon removal completely inhibited lateral root emergence”
Claim · model-written summary
Cotyledon removal reduced the total number of initiated laterals by 40% in pea seedlings.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Cotyledon removale2
- Outcome
- total number of initiated lateralse2
- Direction
- reducede2
- Value
- 40%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Cotyledon removal completely inhibited lateral root emergence and reduced the total number of initiated laterals by 40%”
Claim · model-written summary
Cotyledon removal did not alter the number of laterals initiated per cm of primary root.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Cotyledon removale2
- Outcome
- number of laterals initiated per cm of primary roote2
- Direction
- did not altere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Cotyledon removal did not alter the number of laterals initiated per cm of primary root”
Claim · model-written summary
Epicotyl removal reduced the number of emerged lateral roots.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Epicotyl removale2
- Outcome
- number of emerged lateral rootse2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Epicotyl removal reduced the number of emerged lateral roots but not the total number initiated”
Claim · model-written summary
Epicotyl removal did not change the total number of lateral roots initiated.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Epicotyl removale2
- Outcome
- total number initiatede2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Epicotyl removal reduced the number of emerged lateral roots but not the total number initiated”
Claim · model-written summary
Root tip removal slightly increased the total number of lateral roots formed and emerged.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Root tip removale2
- Outcome
- total number of lateral roots formed and emergede2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Root tip removal slightly increased the total number of lateral roots formed and emerged from the root region remaining after tip excision”
Claim · model-written summary
Sucrose, nicotinic acid and pyridoxine did not promote lateral root emergence when provided as cotyledon substitutes.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Sucrose, nicotinic acid, pyridoxinee2
- Outcome
- lateral root emergencee2
- Direction
- did not promotee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Sucrose, nicotinic acid, pyridoxine, and thiamine did not promote lateral root emergence when provided as cotyledon substitutes”
Claim · model-written summary
Thiamine did not promote lateral root emergence when provided as a cotyledon substitute.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- thiaminee2
- Outcome
- lateral root emergencee2
- Direction
- did not promotee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Sucrose, nicotinic acid, pyridoxine, and thiamine did not promote lateral root emergence when provided as cotyledon substitutes”
Claim · model-written summary
High auxin (10-4 M indolylacetic acid) promoted lateral root initiation and emergence when supplied as a cotyledon substitute.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- High auxin (10-4 M indolylacetic acid)e2
- Outcome
- lateral root initiation and emergencee2
- Direction
- promotede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“High auxin (10-4 M indolylacetic acid) promoted lateral root initiation and emergence when it was a cotyledon substitute”
Claim · model-written summary
High cytokinin (10-4 M 6-benzylaminopurine) inhibited lateral root initiation and emergence when supplied as a root tip substitute.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- High cytokinin (10-4 M 6-benzylaminopurine)e2
- Outcome
- lateral root initiation and emergencee2
- Direction
- inhibitede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“High cytokinin (10-4 M 6-benzylaminopurine) inhibited lateral root initiation and emergence when supplied as a root tip substitute”
Claim · model-written summary
Growth regulator substitutions for the cotyledons or the root tip mimicked the substituted organs.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- Growth regulator substitutionse2
- Outcome
- mimicked the substituted organse2
- Direction
- mimickede2
- Comparator
- the cotyledons or the root tipe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Growth regulator substitutions for either the cotyledons or the root tip mimicked the substituted organs”
Claim · model-written summary
Cotyledons and root tip act together to establish auxin and cytokinin concentrations along the primary root axis that control lateral root initiation and emergence (hypothesis).
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Organ / stage
- cotyledons and root tipe2
- Compound
- auxin and cytokinine2
- Outcome
- lateral root initiation and emergencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pisum sativum `Alaska.'”
e2“Evidence is provided in support of the hypothesis that the cotyledons and root tip act together to establish auxin and cytokinin concentrations along the primary root axis to control lateral root initiation and emergence”
The same questions in other papers
sucrose · growth · Lathyrus oleraceus (pea)Positive and negative results
2 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →nicotinic acid · growth · Lathyrus oleraceus (pea)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.