Comparative study on the developmental stages of reproductive organs (ovule and pollen grains) of Origanum vulgare L.

Subject Areas : Developmental biology of plants and animals , development and differentiation in microorganisms

Somayeh Tahmasebi ¹ (Department of Plant Biology, Faculty of Biology Sciences, University of Kharazmi, Tehran, Iran. [e-mail])
Ahmad Majd ² (Department of Biology, North Tehran Branch, Islamic Azad University, Tehran, Iran.)
Ali Mehrafarin ³ (Cultivation & Development Department of Medicinal Plants Research Center, Institute of Medicinal Plants, Karaj, Iran.)
Parisa Jonoubi ⁴ (Department of Plant Biology, Faculty of Biology Sciences, University of Kharazmi, Tehran, Iran. [e-mail])

Received: 2015-12-18 Accepted : 2016-02-04 Published : 2016-05-21

Keywords: Embryo sac, Microspore, Origanum vulgare, ovule, Pollen grain,

Abstract :

In botanical science developmental and embryological studies are especially important. In this research, developmental stages of pollen grains and ovules were studied in an Origanum genuse, Origanum vulgare. The flower and buds in different developmental stages were removed, fixed in F.A.A, stored in 70% ethanol, embedded in paraffin and sliced with a microtome. Staining was done with Hematoxilin and Eosin. The prepared slided from different developmental stages were studied carefully using a light microscope. The results showed that ovaries were hypogyny type and have four loccules with axile type of placentation. In every locules one ovule, and in embryo sac globular, heart shape, torpedo and cotyledonary embryo were observed. In the anther wall four layers were observed: epiderm, middle layer, mechanical layer and tapetum (from outer to inner layer). In the early stage of pollen development, tapetum was secretory layer then in the late pollen developmental stages becom plasmodium. Tetrads were tetrahedral type. Mature Pollen grains in equatorial view were elongated, elliptic to rectangular-obtuse, and in polar view they were spheroidal, hexahedron-obtuse or hexahedron. The pollen grains were 6-pericolpate that stretches along the equatorial face and narrowing at the poles. The ornamentation of exine surface was reticulate-faveolate. The P/E ratio (Polar axis/Equatorial axis) was 1.13.

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