Document Detail

Induction of acropetal (14)C-photosynthate transport and radial growth by indole-3-acetic acid in Pinus sylvestris shoots.
MedLine Citation:
PMID:  14972949     Owner:  NLM     Status:  Publisher    
The relationship between radial growth and assimilate movement was determined in one-year-old Pinus sylvestris (L.) cuttings collected during the dormant period and reactivated for 1-27 days under environmental conditions favorable for growth. The cuttings were either left with buds intact, defoliated along the distal 8 cm, or debudded and treated apically with 0 or 1 mg g(-1) indole-3-acetic acid (IAA) in lanolin. Radial growth was measured as tracheid production and bark radial width. The distribution of (14)C-photosynthate 1 or 5 days after exposure to (14)CO(2) was used to indicate assimilate movement. Debudding inhibited tracheid production and decreased acropetal (14)C-photosynthate transport, whereas applying IAA to debudded cuttings promoted both these processes and, in addition, induced vigorous callus growth within the bark immediately below the application point. Distal defoliation markedly increased the amount of (14)C-photosynthate transported toward the apex without altering how debudding and exogenous IAA affected tracheid production and the distribution of (14)C-photosynthate. The production of tracheids induced by apically applied IAA in debudded and distally defoliated cuttings increased progressively in material collected on September 9, October 14 and November 24, whereas bark radial width and acropetal (14)C-photosynthate movement increased only between the first two collection dates. Ringing midway between the IAA source and the bottom of the distally defoliated region with a lanolin mixture of 10 mg g(-1)N-1-naphthylphthalamic acid (NPA), 1 mg g(-1) methyl-2-chloro-9-hydroxy-fluorene-9-carboxylic acid (CF) or 10 mg g(-1) phenylacetic acid (PAA) reduced radial growth and [1-(14)C]IAA transport below the ring and locally promoted radial growth and accumulated radioactivity above. (14)C-Photosynthate transport into the region above the ring either was not altered (CF, PAA) or was increased (NPA). The results indicate that apically applied IAA induces the acropetal movement of (14)C-photosynthate in debudded P. sylvestris shoots by locally promoting activity correlated with tracheid and callus production rather than by affecting radial growth or phloem transport processes, or both, at a distance below the IAA source.
C H Little; B Sundberg; A Ericsson
Related Documents :
22204889 - Microbial treatment of the monosodium glutamate wastewater by lipomyces starkeyi to pro...
2855529 - Protein phosphorylation in bacillus thuringiensis during growth and delta-endotoxin pro...
16656279 - Effect of gibberellic acid on elongation and longevity of coleus petioles.
4633349 - Dipicolinic acid location in intact spores of bacillus megaterium.
18553769 - A new batch calorimeter for aerobic growth studies.
22061729 - Sensory improvement of dry-fermented sausages by the addition of cell-free extracts fro...
15471489 - Reestimation of the taft's substituent constant of the pentafluorophenyl group.
25204899 - Dsdna-specific fluorescent copper nanoparticles as a "green" nano-dye for polymerizatio...
20018209 - The key roles of elongases and desaturases in mammalian fatty acid metabolism: insights...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Tree physiology     Volume:  6     ISSN:  0829-318X     ISO Abbreviation:  Tree Physiol.     Publication Date:  1990 Jun 
Date Detail:
Created Date:  2004-02-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100955338     Medline TA:  Tree Physiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  177-89     Citation Subset:  -    
Forestry Canada-Maritimes Region, P.O. Box 4000, Fredericton, New Brunswick, Canada E3B 5P7.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Effects of aluminum on growth and nutrient status of Douglas-fir seedlings grown in culture solution...
Next Document:  Variations in amounts of carbohydrates, amino acids and adenine nucleotides in mulberry tree (Morus ...