Sporogenesis and gametogenesis of some Boraginaceae

Rao, B. Hanumantha; Rao, P. S. P.

doi:10.1002/fedr.4921030106

Cited by 1 publication

(2 citation statements)

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“…Our results confirmed that anther development of S. orientale also belonged to Dicotyledonous type. Overall the reported results represented that certain characters such as protandrous and tetrasporangiate anther, glandular and multinucleated tapetum, tetrahedral and isobilateral microspore tetrads and 3-celled pollen are common in the family of Boraginaceae (Davis, 1966;Khaleel, 1978;Khaleel, 1982;Rao and Rao, 1992;Gabarayeva et al, 2011). According to our results structural and developmental features of anthers in S. orientale are compatible with the family.…”

Section: Discussionsupporting

confidence: 77%

“…S. orientale has hemianatropous, unitegmic and teuniunucellate ovule consistent with Boraginaceae family (Davis, 1966). Rao and Rao (1992) described the development and structure of ovule, megasporogenesis and megagametogenesis of 9 species of 7 genera belonging to Boraginaceae. The researchers indicated that the common features were unitegmic, tenuiunucellate and hemianatropous ovule and Polygonum type embryo sac.…”

Section: Discussionmentioning

confidence: 99%

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Development of Male and Female Gametophyte in Symphytum orientale L. (Boraginaceae)

Vardar

Yavuz

2018

Not Sci Biol

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The presented study elucidates developmental features of male and female gametophyte in Symphytum orientale L. (Boraginaceae). Flower buds were collected from natural habitats (İstanbul-Turkey) in March-April. The anthers of S. orientale were tetrasporangiate with a persistent epidermis and its wall development conformed to the Dicotyledonous type. The endothecium developed fibrous wall thickenings. The middle layer was short-lived and the cells of the glandular tapetum became double nucleated. In the microspore mother cells cytokinesis originated simultaneously after meiosis and the microspore tetrads were tetrahedral or isobilateral. The mature pollen grains were 3-celled when spread to environment. The ovule was hemianatropous, unitegmic and tenuinucellar. The megaspore mother cell functioned directly from the archesporial cell. Polygonum type embryo sac developed from the chalazal megaspore of a linear tetrad generated after meiosis. The synergids were pyriform and the polar nuclei fused shortly before fertilization. The antipodal cells were large and persistent at the stage of globular embryo. Embryogenesis followed the Chenopodiad type and the endosperm represented cellular type. The detailed embryological data of Symphytum orientale L. (Boraginaceae), which is a herbaceous and perennial flowering plant will improve our knowledge of its reproductive behaviour, and provide to comprehend taxonomic connection with related taxa within the Symphytum/Boraginaceae.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%