Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

[Текст] / D. L. Grodnitsky // Zhurnal Obshchei Biol. - 1999. - Vol. 60, Is. 5. - С. 488-509. - Cited References: 158 . - 22. - ISSN 0044-4596РУБ Biology

Аннотация: Consequences derived from the synthetic theory of evolution are in contradiction with facts. The theory affirms that the evolution rate depends on gene variability, intensity of recombination and press of natural selection. It means that fecund organisms with short life cycle have to evolve very quickly. In reality the quickest evolution is observed in mammals, for example in elephants. The theory predicts that evolution can not base only on mutation in the absence of recombination. But parthenogenetic and asexual species evolve very quick, and their variability is not less than that of sexual forms. Contrarily to the neo-Darwinism ideology, evolution takes place not only in constant environment and is often absent even in changing ecosystems. Reproductive isolation and fluctuations in population number are not sufficient conditions for the beginning of evolutionary changes. Numerous data show that the space of opportunities where evolving organisms can travel is constrained by morpho-functional and morpho-genetic factors more than it was considered by the synthetic theory of evolution. It means that evolution should be explained not only in terms of genome, but also using onthogenetic development of an organism and its interactions with environment. Application of organism-focused terminology is possible in the frame of the theory also based on the idea of natural selection, but providing different prognoses, sometimes opposite to the neo-Darwinistic ones.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest Res, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Grodnitsky, D.L.

[Text] / G. F. Antonova, I. A. Chapligina ; ed.: R Lagana, S Kurjatko, , S Kurjat // WOOD STRUCTURE AND PROPERTIES' 06 : ARBORA PUBLISHERS, 2006. - 5th International Symposium Wood Structure and Properties (SEP 03-06, 2006, Sliac Siehnica, SLOVAKIA). - P25-31. - Cited References: 22 . - 7. - ISBN 978-80-968869-4-4РУБ Materials Science, Paper & Wood

Аннотация: The deposition of cellulose, matrix polysaccharides and lignin during secondary cell wall development of early- and latewood in larch (Larix sibirica Ldb.) were studied using biochemical and histochemical methods. Active tissues at successive stages of secondary cell wall development were sampled from larch trunk and characterized by morphological parameters and the content of cellulose, lignin and matrix hemicelluloses, being the structural base for lignification. Matrix polysaccharides were divided by their solubility in 4 % and 24 % KOH and neutral medium. All data were accounted per dry weight and per cell. The amount of biomass (as cell wall cross-section area) deposited before lignification was more in earlywood tracheids than in latewood ones. In contrast. the amount of cellulose at this stage was more in latewood tracheids. The intensity of cellulose synthesis was the highest at the initial stage of lignin deposition in both earlywood and latewood and then declined towards to mature xylem. The intensity of lignin deposition was the highest at the last stage of secondary cell wall development during earlywood formation and from the outset of latewood lignification, dropping towards mature xylem. The contents of A and B hemicellulose fractions linked or not with cellulose, before and after beginning of lignification were different during earlywood and latewood formation. Before lignin deposition, the content of B-4 fraction in both earlywood and latewood was practically equal as well as of B-24, while the amount of A-4 fraction before lignification of early xylem was two times more than that of latewood. This shows different matrix base for the beginning of lignification. All together can be the reason for different physicochemical properties of two types of wood in larch.

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Держатели документа:
Russian Acad Siences, SB, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Antonova, G.F.; Chapligina, I.A.; Lagana, R \ed.\; Kurjatko, S \ed.\; Kurjat, , S \ed.\