Claim · model-written summary
Loss of sieve element function begins with definitive callose in the first formed elements and spreads to newer ones.
- Taxon
- ROBINIA PSEUDOACACIA
Robinia pseudoacaciat0 - Organ / stage
- sieve elementse0
- Outcome
- Cessation of functione0
- Qualifier
- accumulation of definitive callosee0
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cessation of function begins with the accumulation of definitive callose in the first‐formed sieve elements and spreads to those more recently formed.”
t0“ROBINIA PSEUDOACACIA”
Title
THE CAMBIUM AND SEASONAL DEVELOPMENT OF THE PHLOEM IN ROBINIA PSEUDOACACIA
William F. Derr; Ray F. Evert American Journal of Botany 1967. doi:10.1002/j.1537-2197.1967.tb06903.x
Other claims from this paper (12)
- Observation Black locust cambium has several cell layers throughout the year.
- Observation Cambial reactivation follows reduced protoplast density and cell wall thickening, without cell enlargement.
- Observation Periclinal divisions occur throughout the cambial zone when cambial activity resumes.
- Observation Early divisions contribute largely to the phloem side.
- Association Greatest cambial activity coincides with early wood formation.
- Observation Phloem differentiates from early April to late September.
- Observation Annual phloem production varied from 1 to 10 sieve element bands.
- Observation By late November only the last formed sieve elements remain uncollapsed.
- Observation All sieve elements collapse by midwinter before spring phloem production resumes.
- Observation Phloem differentiation precedes xylem differentiation by at least one week.
- Observation Apparently functional sieve elements appear three weeks before new functional vessel elements.
- Observation Xylem and phloem production ends simultaneously in most trees.