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Plant Physiology 94:1743-1747 (1990)
© 1990 American Society of Plant Biologists

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Development and Growth Regulation

The Role of Auxin and Gibberellin in Controlling Lignin Formation in Primary Phloem Fibers and in Xylem of Coleus blumei Stems

Roni Aloni, Marie Thérèse Tollier and Bernard Monties

Department of Botany, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978 Israel, Laboratoire de Chimie Biologique, INRA, INA-Paris-Grignon, F78850 Thiverval Grignon, France

The hypothesis that auxin (IAA) and gibberellic acid (GA3) control the formation of lignin is confirmed for the primary phloem fibers and for the secondary xylem in the stem of Coleus blumel Benth. Indoleacetic acid alone, or a combination of high IAA/low GA3 (w/w), induced short phloem fibers with thick secondary walls, that contained lignin rich in syringyl units (high ratio of syringyl/guaiacyl). On the other hand, a combination of high GA3/low IAA (w/w), which promoted the differentiation of long phloem fibers with thin walls, decreased the relative content of the syringyl units (low syringyl/guaiacyl ratio). In the secondary xylem, these hormonal treatments yielded only slight changes in the noncondensed monomeric guaiacyl units, confirming the relative stability of the guaiacyl lignification pattern in this tissue. In the xylem, indoleacetic acid alone, or a combination of high IAA/low GA3 induced lignin poor in syringyl units (low syringyl/guaiacyl ratio). A combination of high GA3/low IAA promoted a relatively slight increase in syringyl yield, indicating greater responsiveness of the syringyl lignification pattern to growth regulators. The possible functional and technological significance of our results is discussed.




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G. SENGUPTA and P. PALIT
Characterization of a Lignified Secondary Phloem Fibre-deficient Mutant of Jute (Corchorus capsularis)
Ann. Bot., February 1, 2004; 93(2): 211 - 220.
[Abstract] [Full Text] [PDF]


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Copyright © 1990 by the American Society of Plant Biologists