Articles – Embryology of Dypsis decaryi (Arecaceae)

Embryology of Dypsis decaryi (Arecaceae)

Botanicheskii zhurnal №9 / 2021 . – P. 898-901

DOI: 10.31857/S000681362109009X
Citation database: Scopus

Heading: Сообщения

Authors: Krishna H. N. Kumar

Name in english: Embryology of Dypsis decaryi (Arecaceae)

Abstract in english:
The paper deals with the study of microsporogenesis and male gametophyte development, megasporogenesisand female gametophyte development in Dypsis decaryi (Jum.) Beentje et J. Dransf. The anther is tetraspo-rangiate and each sporangium is encircled by wall layers of an outer epidermis and an inner glandular tape-tum. Immediately below the epidermis, an endothecium is present. Two middle layers are located between endothecium and tapetum. Simultaneous quadripartition in the pollen mother cells results in tetrads. The microspore tetrads are isobilateral and tetrahedral. Rarely polyspory has been noticed. The pollen grains are 2-celled when shed. The ovary is superior, tricarpellary and syncarpous. The ovules are bitegmic and crassi-nucellate. The sporogenous cell directly develops into megaspore mother cell. Seldom two megasporocytes are met with in a single ovule. The megaspore tetrad is linear. The development of the female gametophyte follows the Polygonum type.

Keywords in English: Dypsis decaryi, anther wall, pollen grains, ovule, megasporogenesis

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