Embryological study of Gentiana cruciata L. (Gentianaceae) from Bulgaria

Year 2010, Volume: 4 Issue: 2, 19 - 23, 01.07.2010

Elina Yankova Petka Yurukova

https://izlik.org/JA89SB42MC

Abstract

Embryological study on the Bulgarian native populations of Gentiana cruciata L. has been carried out. The anther is tetrasporangiate. Its wall develops according to Dicotyledonous-type and consists of epidermis, fibrous endothecium, two middle layers and glandular tapetum. The simultaneous microsporogenesis leads to formation of predominantly tetrahedral microspore tetrads. The mature pollen grains are 2-celled. The ovule is anatropous, tenuinucellate and unitegmic with unicellular archesporium. The development of the embryo sac follows the Polygonumtype and rarely - the Allium-type. The legitimate embryo and endosperm develop after double fertilization. The embryogenesis runs according to Asterad-type. Initially, the endosperm is nuclear. In some ovules somatic apospory was established

Keywords

Gentiana , embryology , male and female gametophyte , embryo , endosperm