: материалы временных коллективов / E. V. Bazhina, O. V. Kvitko, E. N. Muratova // Eurasian Journal of Forest Research. - 2008. - Vol. 11-1. - С. 41-49. - Библиогр. в конце ст.
Аннотация: Meiosis in Siberian fir is characterized by asynchrony (prophase I and tetrads in the same microsporangium simultaneously). Up to 4 nucleoli (in naturals stands) and 5 (in an arboretum) are observed at prophase I. The shortest meiotic stages are telophase I and 2. Each of them is observed in 0.2% (in an arboretum) and 0.05% (in natural stands) of cells. In natural stands meiosis elapses quickly (within 2 days). In an arboretum it can continue for more than two weeks. Mainly meiosis is regular. Meiotic irregilarities are, though, also encountered at different stages (fragments, bridges, etc.). In trees growing in an arboretum the total number of irregular cells can reach 17.9%. In natural populations only 11.7-13.3% of cells are irregular. The spectrum of meiotic irregularities in an arboretum is wider than in natural stands.
Держатели документа:
Институт леса им. В.Н. Сукачева Сибирского отделения Российской академии наук : 660036, Красноярск, Академгородок, 50, стр., 28
Доп.точки доступа:
Kvitko, Ol'ga Viktorovna; Квитко, Ольга Викторовна; Muratova, Elena Nikolayevna; Бажина, Елена Васильевна
Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН
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Найдено документов в текущей БД: 2
Meiosis at microsporogenesis in Siberian fir (Abies sibirica Ledeb.) in natural populations and in an arboretum
Specific features of microsporogenesis in the Siberian larch growing under the conditions of technogenic load
/ L. I. Romanova, I. N. Tret'yakova // Ontogenez. - 2005. - Vol. 36, Is. 2. - С. 128-134
. - ISSN 0475-1450
Кл.слова (ненормированные):
Aberrations -- Asynchrony -- Meiosis -- Microsporocytes -- Technogenic pollution -- Tetrads -- air pollutant -- article -- Larix -- meiotic prophase I -- physiology -- pollen -- season -- ultrastructure -- Air Pollutants -- Larix -- Meiotic Prophase I -- Pollen -- Seasons
Аннотация: Studies of microsporogenesis in the Siberian larch growing in Krasnoyarsk and its suburbs have shown that meiosis starts in October. Microsporocytes winter at prophase I (leptoneme, diploneme). Reduction divisions in male generative buds are resumed and terminated in spring, in March. However, in the case of thaws during the autumn-winter period, meiotic division proceeds in the larch buds and this leads to the formation of degrading tetrads and pollen. Hence, the organic quiescence is absent in the larch in winter. It was shown that in the larch growing in the city, meiosis proceed more asynchronously than in the background tree stands. An increase of chromosomal aberrations during the reduction division was noted under the conditions of technogenic pollution.
Scopus,
Полный текст,
Scopus
Держатели документа:
Siberian State Technological University, pr. Mira 82, Krasnoyarsk, 660049, Russian Federation
Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Romanova, L.I.; Tret'yakova, I.N.
Кл.слова (ненормированные):
Aberrations -- Asynchrony -- Meiosis -- Microsporocytes -- Technogenic pollution -- Tetrads -- air pollutant -- article -- Larix -- meiotic prophase I -- physiology -- pollen -- season -- ultrastructure -- Air Pollutants -- Larix -- Meiotic Prophase I -- Pollen -- Seasons
Аннотация: Studies of microsporogenesis in the Siberian larch growing in Krasnoyarsk and its suburbs have shown that meiosis starts in October. Microsporocytes winter at prophase I (leptoneme, diploneme). Reduction divisions in male generative buds are resumed and terminated in spring, in March. However, in the case of thaws during the autumn-winter period, meiotic division proceeds in the larch buds and this leads to the formation of degrading tetrads and pollen. Hence, the organic quiescence is absent in the larch in winter. It was shown that in the larch growing in the city, meiosis proceed more asynchronously than in the background tree stands. An increase of chromosomal aberrations during the reduction division was noted under the conditions of technogenic pollution.
Scopus,
Полный текст,
Scopus
Держатели документа:
Siberian State Technological University, pr. Mira 82, Krasnoyarsk, 660049, Russian Federation
Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Romanova, L.I.; Tret'yakova, I.N.