Сводный каталог книг

[Text] = Untersuchungen uber die geeignete Keimdauer fur Fohren- und Fichtensamen = Undersokningar av den lampliga groningstiden for tall- och granfro : научное издание / S.K. Kamra. - Stockholm : Skogshogskolan, 1969. - 16 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 73). - eng. - Библиогр.: 15. - 0.20 р.

УДК

06

Аннотация: In this investigation the effect of the germination periods of 14, 21 and 30 days was studied on the percentage and the rate of germination of Pinus silvestris and Picea abies seed. Samples from areas lying between 50 degrees N and 68 degrees N latitudes were used. Seed with well-developed embryo and endosperm and with high viability, as well as that with reduced viability due to age or due to poor embryo and/or endosperm development was tested. The results showed that in former type of seed, a germination period of 14 days may be adequate. However, in the later type of seed, a longer period (21 or 30 days) may be desirable, so that a sample can attain its maximum germination percentage

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[Text] = Froutveckling efter sjalvpollinering och korspollinering av tall, Pinus silvestris L. : научное издание / C.P. Forshell. - Stockholm : Skogshogskolan, 1974. - 37 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 118). - eng. - Библиогр.: с. 36-37. - ISBN 91-38-01972-8 : 0.50 р.

УДК

06

Аннотация: The development of pollen tubes and ovules and the formtion of embryos and endosperm after different types of pollination: self-pollination, cross-pollination and wind-pollination were studied in ten clones of Pinus silvestris. Pollination and fertilization took place in all types of pollination. At a certain stage of development, however, embryos in some seeds began to degenerate. This degeneration was followed by a breaking down of the endosperm and resulted in empty seeds. The percentage of degenerated seeds was highest after self-pollination, considerably lower after wind-pollination. The results indicate that inviable zygotes, homozygous for lethal or sub-lethal genes, are formed after self-pollination and explain the high percentage of empty seeds usually found after this type of pollination. Wind-pollination may to some extent involve self-pollination. No clone was found to be quite self-sterile, but the differences in self-fertility between the clones were rather great.

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[Text] = Forandringar i ultrastrukturen hos fron av Pinus sylvestris L. under aldrande : научное издание / L.K. Simola. - Stockholm : Skogshogskolan, 1974. - 22 p. : рис. - (Studia Forestalia Suecica, ISSN 0039-3150 ; 119). - eng. - Библиогр.: с. 13. - ISBN 91-38-02082-3 : 0.50 р.

УДК

06

Аннотация: The ultrastructure of three parts (endosperm, rootlets and cotyledons) of aged seeds of Pinis sylvestris L. has been studied. In dry seeds no clear differences resulting from ageing are seen as compared with resting living cells, but during inbibition clear differences are evident. Inhibition of development of the DNA-containing structures, mitochondria and plastids, was the first indication of senescence. Lypolysis usually preceded proteolysis, in contrast to the course of events in living cells.

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