Comparative vegetative anatomy of South Indian Vandas (Orchidaceae)

Ayyasamy, Kowsalya; Rojamala, Karunakaran; Muthukumar, Thangavelu

doi:10.1016/j.flora.2017.09.002

Cited by 14 publications

(18 citation statements)

References 43 publications

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“…This condition is generally advantageous for evergreen orchids like S. nivea occurring in monsoonal dry environments. Limited studies have examined the stem anatomy of orchids than root and leaves (Kowsalya et al 2017;Balachandar et al 2019). Stems of S. nivea possess a thick cuticle which is in accordance with the observation of Kowsalya et al (2017) in Vandas growing in south India.…”

Section: F-valuesupporting

confidence: 57%

“…Limited studies have examined the stem anatomy of orchids than root and leaves (Kowsalya et al 2017;Balachandar et al 2019). Stems of S. nivea possess a thick cuticle which is in accordance with the observation of Kowsalya et al (2017) in Vandas growing in south India. The hardy stem of S. nivea was completely covered by the leaf sheath as in Luisia, where, the leaf sheath covered almost the entire internode (Balachandar et al 2019).…”

Section: F-valuesupporting

confidence: 57%

“…Comparison of stomata, epidermis and cuticle characteristics using student's t-test. (Yang et al 2016;Kowsalya et al 2017;Shenbagam 2017, 2018;Rindyastuti et al 2018). The cuticle is a hydrophobic covering made up of cutin and solvent soluble cuticular waxes.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Anatomical investigations of orchids assist in resolving the problems related to the identification of plants in their vegetative stage (Kowsalya et al 2017;Balachandar et al 2019). Anatomy also helps to overcome the systematic problems and is a useful tool in the precise identification of plants in same genera sharing similar morphological characteristics (Kowsalya et al 2017). Though detailed observation of vegetative anatomy of Aeridineae taxa like Acampe, Amesiella, Chiloschista, Microtatorchis, Neofinetia, Phalaenopsis, Taeniophyllum, Trichoglottis, and Vanda are available (Carlsward et al 2006;Carlsward 2014;Kowsalya et al 2017) the vegetative anatomy of members belonging to Schoenorchis are unknown except for a couple of studies involving foliar and nectary anatomical investigations (Stpiczyńska et al 2011;Angela et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Vegetative anatomy and mycorrhizal morphology of Schoenorchis nivea (Lindl.) Schltr., (Orchidaceae) and their adaptive significance

Balachandar¹,

Ravi²,

Nagaraj³

et al. 2019

Acta Biol Szeged

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The anatomical description of the vegetative parts (leaf, leaf sheath, stem and root) and mycorrhizal morphology of Schoenorchis nivea (Lindl.) Schltr., belonging to the subfamily Epidendroideae of Orchidaceae was investigated. Leaves were amphistomatic covered by 10-12 μm thick cuticle, stomata paracytic with small and irregular substomatal chambers. Mesophyll homogenous, composed of thin-walled chlorenchymatous cells. Banded water-storage cells abundant in the mesophyll and the largest vascular bundle occurred at the centre of the leaf. The leaf sheath has both adaxial and abaxial epidermis covered with cuticle, homogenous mesophyll, water-storage cells, raphides and vascular bundles. The stem is surrounded by a uniseriate epidermis, cortex consisting of thick-walled fibers and collateral vascular bundles scattered in the ground tissue. Cortical proliferation was evident in S. nivea stem. Root hairs present in root regions were in contact with the substratum. Root hairs frequently branched at their tips. Root possess 2-3 layered velamen, ∩-thickened exodermal cells, O-thickened uniseriate endodermis, and cortex of thin-walled parenchymatous cells containing raphides and water-storage cells. Cover cells present. Xylem arches are 9-11, with vascular tissues embedded in sclerenchymatous cells. Pith composed of thick-walled sclerenchymatous cells with intercellular space. The stomatal characteristics in leaf, the size of water-storage cells and vascular bundles exhibited significant variation in different plant parts. Intact and degenerating pelotons of orchid mycorrhizal fungi were observed in the root cortical cells. The observations of the present study clearly indicate that S. nivea possesses several anatomical adaptations to thrive in epiphytic habitats.

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Section: F-valuesupporting

confidence: 57%

Section: F-valuesupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vegetative anatomy and mycorrhizal morphology of Schoenorchis nivea (Lindl.) Schltr., (Orchidaceae) and their adaptive significance

Balachandar¹,

Ravi²,

Nagaraj³

et al. 2019

Acta Biol Szeged

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Vegetative anatomy and its systematic significance in the Dryadella Luer (Orchidaceae: Pleurothallidinae)

et al. 2020

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Dryadella comprises 54 neotropical species with a disjunct distribution in the Andean region and the Atlantic Rainforest. This work investigated the vegetative anatomy of 13 species of Dryadella, and Masdevallia infracta selected as an outgroup, to search for distinctive characteristics of the genus, characters to differentiate disjunct Atlantic Rainforest and the Andean groups, and the traditional infrageneric classification, based mainly in vegetative characters. Twenty-seven anatomical vegetative characters were analysed in light microscopy-LM and scanning electron microscope-SEM and evaluated by Cluster and Principal Coordinates Analysis-PCoA. Results from statistical and Cluster analysis exhibited morpho-anatomical similarity among Dryadella species. PCoA indicated separation between Dryadella ataleiensis and D. pusiola from other species with average support by silhouette analysis. The two most relevant characteristics to distinct clusters were the shape of the ramicaul in cross-section, and the ornamentation of leaf cuticle in the adaxial surface. Statistical analyses indicated that endemic groups of the Atlantic Rainforest and the Andean region do not present morpho-anatomical differences, and infrageneric sections are not supported by the characters investigated. This similarity may be related to the recent origin and rapid diversification of species, as shown in previous studies on Pleurothallidinae. Therefore, the morpho-anatomical characters observed here are stable and may be useful for taxonomy and genus characterisation.

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Comparative foliar anatomical and pollen morphological studies of Acanthaceae using light microscope and scanning electron microscope for effective microteaching in community

Raza

Ahmad

Zafar

et al. 2020

Microscopy Res & Technique

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In this study, foliar anatomy and pollen morphology of 10 species of Acanthaceae has been investigated using light and scanning electron microscopy. The study was aimed to highlight the role of microscopy in microteaching at community for proper characterization of plants using palyno‐anatomical characters including pollen type, exine sculpturing, shape of epidermal cells, pattern of anticlinal wall, type and size of stomata, and trichome. Most of the species have polygonal cell shapes but some species have irregular, tetragonal, and pentagonal shape of epidermal cells. The largest epidermal cell length on adaxial and abaxial surface were observed in Asystasia gangetica 66.95 and 87.40 μm whereas least was observed on adaxial surface in Justicia adhatoda 36.9 μm and on abaxial surface in Barleria cristata 35.65 μm. In anatomy, species have diacytic type of stomata, whereas stomata of paracytic type observed in two species, while in A. gangetica cyclocytic type of stomata are present. Quantitively on abaxial surface, largest stomata length 29.9 μm and width 24.30 μm was noted in B. cristata. While shortest stomata length was observed in Ruellia prostrata 25.95 μm whereas minimum width of stomata was examined in Barleria acanthoides 2.05 μm. The diversity of trichomes are present in all species except in Ruellia brittoniana. Acanthaceae can be characterized by exhibiting different pollen morphology having five types of pollen shapes, prolate, spheroidal, perprolate, subprolate, and oblate spheroidal. Exine peculiarities showing variations such as reticulate, granulate, coarsely reticulate, lophoreticulate, perforate tectate, and granulate surface were examined.

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Comparative vegetative anatomy of South Indian Vandas (Orchidaceae)

Cited by 14 publications

References 43 publications

Vegetative anatomy and mycorrhizal morphology of Schoenorchis nivea (Lindl.) Schltr., (Orchidaceae) and their adaptive significance

Vegetative anatomy and mycorrhizal morphology of Schoenorchis nivea (Lindl.) Schltr., (Orchidaceae) and their adaptive significance

Vegetative anatomy and its systematic significance in the Dryadella Luer (Orchidaceae: Pleurothallidinae)

Comparative foliar anatomical and pollen morphological studies of Acanthaceae using light microscope and scanning electron microscope for effective microteaching in community

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