Display options
Cite
Savidge RA, Heald JK, Wareing PF. Non-uniform distribution and seasonal variation of endogenous indol-3yl-acetic acid in the cambial region of Pinus contorta Dougl. Planta. 1982;155(1):89-92doi: 10.1007/BF00402937.
Savidge, R. A., Heald, J. K., & Wareing, P. F. (1982). Non-uniform distribution and seasonal variation of endogenous indol-3yl-acetic acid in the cambial region of Pinus contorta Dougl. Planta, 155(1), 89-92. https://doi.org/10.1007/BF00402937
Savidge, R A, et al. "Non-uniform distribution and seasonal variation of endogenous indol-3yl-acetic acid in the cambial region of Pinus contorta Dougl." Planta vol. 155,1 (1982): 89-92. doi: https://doi.org/10.1007/BF00402937
Savidge RA, Heald JK, Wareing PF. Non-uniform distribution and seasonal variation of endogenous indol-3yl-acetic acid in the cambial region of Pinus contorta Dougl. Planta. 1982 Jun;155(1):89-92. doi: 10.1007/BF00402937. PMID: 24271632.
Copy Download .nbib Format: NLM
Share it on

Planta. 1982 Jun;155(1):89-92. doi: 10.1007/BF00402937.

Non-uniform distribution and seasonal variation of endogenous indol-3yl-acetic acid in the cambial region of Pinus contorta Dougl.

Planta

R A Savidge, J K Heald, P F Wareing

Affiliations

  1. Department of Botany and Microbiology, University College of Wales, SY23 3DA, Aberystwyth, Dyfed, UK.

PMID: 24271632 DOI: 10.1007/BF00402937

Abstract

Endogenous, free indol-3yl-acetic acid (IAA) levels were measured in the main stem in the 10-year-old cambial zone, in the adjoining differentiating xylem, and in the adjoining mature xylem of 15-20-year-old Pinus contorta Dougl. by single-ion-current monitoring, combined gas chromatography - mass spectrometry, on several dates from early spring to early winter. Microscopy was used to determine the state of cambial activity on each harvest date. The IAA levels were found to be nearly constant at 1 μg g(-1) DW in the cambial zone from March to July, then to increase to near 2 μg g(-1) DW during the remainder of the growth season. No clear correlation was evident between number of fusiform cells per radial file and IAA content in the cambial zone. By contrast, the IAA content in differentiating xylem was higher than that in the adjoining meristematic zone on all harvest dates and also exhibited marked seasonal variation, peaking near 16 μg g(-1) DW in mid summer, and declining to 1 μg g(-1) DW in autumn. In mature xylem, IAA levels were very low and showed negligible variation. The fresh weight to dry weight ratio of differentiating xylem was greater than that of the cambial zone, and greater in the cambial zone than in mature xylem.

References

  1. Plant Physiol. 1977 Mar;59(3):372-5 - PubMed
  2. Plant Physiol. 1969 Jan;44(1):27-36 - PubMed
  3. Planta. 1981 Dec;153(5):395-404 - PubMed
  4. Planta. 1977 Jan;134(3):223-8 - PubMed
  5. Planta. 1977 Jan;136(1):91-6 - PubMed

Publication Types