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Critical stages of ovule and seed development

100%

Shamrov I. I., Anisimova G. M.

Acta Biologica Cracoviensia. Series Botanica

2003

tom 45

nr 1

A study of Gentiana cruciata L. (Gentianaceae), Gymnadenia conopsea (L.) R.Br. (Orchidaceae) and Luzula pedemontana Boiss. et Reut. (Juncaceae) showed differences in the number and characteristics of critical stages in ovule and seed development. The shared critical stages explain the general direction of the formation of reproductive structures and surrounding tissues. The taxon-specific critical stages may have different implications in a given species: they may (1) verify that the ovule belongs to a specific type, (2) indicate their lability in different taxa with the same ovule type, or (3) coincide in species with various ovule types.

Translocation pathways for metabolites in developing ovules of Gentiana cruciata L., Gymnadenia conopsea [L.] R.Br., Gagea stipitata Merklin and Luzula pedemontana Boiss.et Reut.

100%

Shamrov I. I.

Acta Biologica Cracoviensia. Series Botanica

2000

tom 42

nr 1

The metabolites in the ovule come from the receptacle, ovary wall and placenta. They are accumulated in the chalaza and then translocated in reproductive and somatic structures via a system of specialized tissues. The hypostase is of great importance because it lies at the boundary of the chalaza with the nucellus and integuments, and contacts the vascular bundle. In the megagametophyte, the cell walls, which have many outgrowths, receive metabolites from the hypostase via podium and postament tissues. Histochemical data on accumulation of proteins, polysaccharides, lignin and tannins in tissues during ovule and seed development are presented. The dynamics of these substances and the character of metabolism in tissues are suggested as indicators of metabolite flow.

Ograniczanie wyników

2 Acta Biologica Cracoviensia. Series Botanica

2 Shamrov I. I.

1 Anisimova G. M.

1 2003

1 2000

Wyniki wyszukiwania

Critical stages of ovule and seed development

Translocation pathways for metabolites in developing ovules of Gentiana cruciata L., Gymnadenia conopsea [L.] R.Br., Gagea stipitata Merklin and Luzula pedemontana Boiss.et Reut.