We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Microautoradiographic detection of CO fixation in lenticel chlorenchyma of young Fraxinus excelsior L. stems in early spring.
- Authors
Langenfeld-Heyser, Rosemarie; Schella, Bruno; Buschmann, Kirsten; Speck, Frieder
- Abstract
Microautoradiography indicated that 1-year-old Fraxinus excelsior L. stem chlorenchyma assimilated externalCO in mid-April, when buds were swollen, but before bud-break. The lenticel regions showed the highest amount of radioactively labeled assimilates. Labeled assimilates declined in the tangential direction with increasing distance from lenticels, suggesting thatCO entered the stem through the open intercellular spaces of lenticels. In the radial direction, the amount of radioactively labeled assimilates did not constantly decline with growing distance from the lenticel entrance. It was high in all lenticel phelloderm cells, which had high chlorophyll autofluorescence and very small starch grains, highest in the adjacent 4-6 rows of chlorenchyma, which had larger starch grains that increased in size towards the interior rows, and much lower in the inner cortex chlorenchyma, which had large starch grains. We suggest that the main function of the lenticel chlorenchyma (lenticel phelloderm plus 4-6 rows of adjacent cortex chlorenchyma) is the refixation of respiratory CO which could easily leave the stem intercellular spaces, rather than the fixation of external CO. The lenticel chlorenchyma could reduce the loss of respiratory CO by its photosynthetic activity.
- Publication
Trees: Structure & Function, 1996, Vol 10, Issue 4, p255
- ISSN
0931-1890
- Publication type
Academic Journal
- DOI
10.1007/BF02185677