Endosperm development in Arabidopsis thaliana [L.] Heynh

• Autorzy: Herr J. M.
• Języki publikacji: EN

Abstrakty

EN

According to many reports, the endosperm of Arabidopsis thaliana (L.) Heynh. follows Nuclear-type development whereby the primary endosperm nucleus divides without cytokinesis, ultimately to produce a peripheral, multinuclear endosperm tissue. However, some features of endosperm development in seeds collected from populations in central South Carolina reveal striking differences from the Nuclear type of other Brassicaceae. Nuclei produced by the first division of the central or slightly chalazal primary endosperm nucleus quickly migrate to opposite poles on the longitudinal axis, where the chalazal nucleus immediately becomes enshrouded with dense cytoplasm. Divisions from that point onward are free-nuclear and frequent in the micropylar portion, which enlarges markedly as it becomes multinucleate. The chalazal endosperm is sometimes positioned in a different focal plane as a result of curvature of the immature seed toward amphitropous form. It does not enlarge appreciably and accumulates only 2-8 nuclei before it gradually degenerates, persisting until digested during maturation of the developing embryo. Thus, the functional endosperm is produced primarily by the micropylar chamber.

Słowa kluczowe

EN

Hypericum acutum; micropylar chamber; Helobial type; Arabidopsis thaliana; Hypericum japonicum; South Carolina; cytokinesis; cytoplasm; micropylar portion; seed; angiosperm; Santalum album; seed evolution; endosperm development; embryo; Hypericum mysorense

• Wydawca: -
• Czasopismo: Acta Biologica Cracoviensia. Series Botanica
• Rocznik: 1999
• Tom: 41
• Opis fizyczny: p.103-109,fig.

Twórcy

autor

Herr J. M.

• University of South Carolina, Columbia, South Carolina 29208, USA

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