Temat: vacuolation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Cytoembryology of infertile segregants of the hybrid Lupinus varius L. x L. digitatus Forsk
Autorzy:: Kazimierska, E M
Kazimierski, T.
Powiązania:: https://bibliotekanauki.pl/articles/2048189.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Lupinus digitatus
cytoembryology
embryology
interspecific hybrid
plant genetics
gametophyte
sterility
vacuolation
sporophyte
megasporogenesis
megagametogenesis
chromosome
Lupinus varius
hybrid
sporogenic cell
Opis:: In F₂, F₃ and F₄ generations of one hybrid line of Lupinus varius × L. digitatus, segregation into infertile and fertile plants in the ratio 3:1 was observed. Cytoembryological analyses showed that sterility was caused by irregularities in megasporocyte formation, in megasporogenesis and megagametogenesis. The following abnormalities lead to female sterility: no megasporogenic cells separated in nucelluses; in other nucelluses with megaspore mother cells, these cells underwent vacuolation and died before reduction division. In the megaspore mother cells, in which probably meiosis occurs, the megasporocyte division is irregular; a restitution nucleus is frequently formed after reduction division and such megasporocyte develops into an embryo sac. In 8-nucleate embryo sacs a change in the nucellus polarization was observed, while in rarely encountered embryo sacs the embryo cells underwent vacuolation and then died. Female sterility in the studied segregants is determined genetically, whereas sterilization of reproduction cells is a developing process throughout the period of sporocyte and female gametophyte formation.
Źródło:: Journal of Applied Genetics; 1995, 36, 3; 215-227
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A comparative cytological and morphometric analysis of vacuolation in central tissue of the effective and ineffective pea [Pisum sativum L.] root nodules
Autorzy:: Borucki, W
Powiązania:: https://bibliotekanauki.pl/articles/56613.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: cytological observation
vacuole
botany
central tissue
vacuolation
pea
infected cell
Pisum sativum
three-dimensional reconstruction
morphometric analysis
root nodule
Opis:: Vacuoles play very important physiological roles in plant cells. Pea root nodules, which exhibit distinct zonation (meristematic zone and central tissue zones), may serve as a good experimental model for the investigations of vacuole development and its importance to cell and tissue functioning. Moreover, the nodule central tissue is composed of both infected and uninfected cells which play different physiological roles and differ in the level of vacuolation. Cytological observations revealed that central vacuoles of the infected cells of the effective nodules expand toward cell walls. Thus only thin layers of the cytoplasm separate each central vacuole from plasma membrane and cell wall. This finding is discussed from the viewpoint of improved exchange of solutes and water between the central vacuole and apoplast of the infected cell. Three-dimensional reconstruction of the vacuoles of infected cells within a fragment of effective nodule central tissue, showed their spatial arrangement. Possible advantages coming from the spatial arrangement of vacuoles within the central tissue are discussed. A comparative study of the central tissue (bacteroidal tissue) and meristem vacuolation of the effective and ineffective pea root nodules is also presented. Morphometric measurements revealed that the effective nodule central tissue was more vacuolated than the ineffective one. It was proved that maturation of the infected cells involves dynamic changes in their vacuolation. Having numerous fixing nitrogen bacteroids, the infected cells of effective central tissue were less vacuolated than uninfected cells. On the other hand, both infected and uninfected cells of the effective central tissue showed a much higher level of vacuolation in nitrogen-fixing zone than cells of the same type in ineffective tissue. These results indicate that vacuolation is an important factor in development and functioning of pea root nodule central tissue.
Źródło:: Acta Societatis Botanicorum Poloniae; 2007, 76, 2
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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