Abstract:
:FT-IR and X-ray analyses were employed to determine the relative ratio of cellulose Ialpha and Ibeta crystalline phases present in each developmental stage of coniferous tracheid cell wall formation. The IR spectra showed that initially the Ialpha phase occupies 50% of the crystalline regions in the primary cell wall cellulose and this value drops to 20% after ceasing of the cell enlarging growth for the formation of the secondary wall cellulose (the remaining regions are composed of the Ibeta phase). Although it is reasonable that the content for Ibeta, which is stress-reduced crystalline form, was higher in the secondary wall formation (Kataoka Y, and Kondo T. Macromolecules 1996;29:6356 6358) it is more interesting that during the crystallization of stress-induced Ialpha cellulose for the primary wall the stress-reduced Ibeta, is also possible to be crystallized in an alternative way. This means that throughout the period the Ialpha-causing stress may not be necessarily kept loaded. In light of our previously reported hypothesis (Kataoka Y. and Kondo T. Macromolecules 1998;31:760-764) for the formation of Ialpha phase due to cellular growing stresses in the primary wall cellulose, such an alternating on-off stress effect to account for the occurrence of both Ialpha and Ibeta phases might be related to a biological growth system in coniferous wood cells.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Kataoka Y,Kondo Tdoi
10.1016/s0141-8130(98)00065-8keywords:
subject
Has Abstractpub_date
1999-01-01 00:00:00pages
37-41issue
1eissn
0141-8130issn
1879-0003pii
S0141-8130(98)00065-8journal_volume
24pub_type
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