Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid
In Calanthe tricarinata Lindl., anther primordium develops two thecae each with a mass of densely cytoplasmic archesporial cells surrounded by the protoderm. A six-layered anther wall develops from the archesporial cells of hypodermal layer. Cells in the tapetum are binucleate, only reported in a fe...
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doaj-6bb657df9b4f4e548c1f1a610ed87db72020-11-24T21:43:12ZengNational Taiwan UniversityTaiwania0372-333X0372-333X2019-07-0164326927910.6165/tai.2019.64.269Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchidRavi Kant0Department of Botany, Sri Guru Teg Bahadur Khalsa College, Sri Anandpur Sahib- 140118, Punjab, India.In Calanthe tricarinata Lindl., anther primordium develops two thecae each with a mass of densely cytoplasmic archesporial cells surrounded by the protoderm. A six-layered anther wall develops from the archesporial cells of hypodermal layer. Cells in the tapetum are binucleate, only reported in a few primitive orchids. Formation of two septa in each theca results into eight microsporangia which is a primitive character. Pollen mother cells undergo simultaneous cytokinesis and form tetrahedral, rhomboidal, decussate, T-shaped, square and linear type of microspore tetrads. Pollen grains unite to form eight pollinia, which is a primitive feature in the family Orchidaceae. Pollinia unite to the viscidium through long caudicles to form a structure called the pollinarium unit. Pollen grains are monoaperturate with smooth exine. Present observations contribute significantly in the taxonomy and understanding character evolution in the family Orchidaceae.http://tai2.ntu.edu.tw/taiwania/abstract.php?type=abstract&id=1624Anther wallBinucleate tapetumCalanthe tricarinataCaudicleOrchidPolliniumSeptum |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ravi Kant |
spellingShingle |
Ravi Kant Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid Taiwania Anther wall Binucleate tapetum Calanthe tricarinata Caudicle Orchid Pollinium Septum |
author_facet |
Ravi Kant |
author_sort |
Ravi Kant |
title |
Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid |
title_short |
Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid |
title_full |
Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid |
title_fullStr |
Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid |
title_full_unstemmed |
Development of pollinium and associated changes in anther of Calanthe tricarinata Lindl., an epidendroid orchid |
title_sort |
development of pollinium and associated changes in anther of calanthe tricarinata lindl., an epidendroid orchid |
publisher |
National Taiwan University |
series |
Taiwania |
issn |
0372-333X 0372-333X |
publishDate |
2019-07-01 |
description |
In Calanthe tricarinata Lindl., anther primordium develops two thecae each with a mass of densely cytoplasmic archesporial cells surrounded by the protoderm. A six-layered anther wall develops from the archesporial cells of hypodermal layer. Cells in the tapetum are binucleate, only reported in a few primitive orchids. Formation of two septa in each theca results into eight microsporangia which is a primitive character. Pollen mother cells undergo simultaneous cytokinesis and form tetrahedral, rhomboidal, decussate, T-shaped, square and linear type of microspore tetrads. Pollen grains unite to form eight pollinia, which is a primitive feature in the family Orchidaceae. Pollinia unite to the viscidium through long caudicles to form a structure called the pollinarium unit. Pollen grains are monoaperturate with smooth exine. Present observations contribute significantly in the taxonomy and understanding character evolution in the family Orchidaceae. |
topic |
Anther wall Binucleate tapetum Calanthe tricarinata Caudicle Orchid Pollinium Septum |
url |
http://tai2.ntu.edu.tw/taiwania/abstract.php?type=abstract&id=1624 |
work_keys_str_mv |
AT ravikant developmentofpolliniumandassociatedchangesinantherofcalanthetricarinatalindlanepidendroidorchid |
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