Stomata in Caladium (Araceae)

Anatomical characteristics of Nigerian variants of Caladium bicolor (Aiton) Vent. (Araceae)

Ekeke C., Agbagwa I. O. (2016)

Chimezie Ekeke, Ikechukwu O. Agbagwa,

Department of Plant Science and Biotechnology, Faculty of Science, University of Port Harcourt, Nigeria.

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Afr. J. Plant Sci. 10(7): 121-129 – DOI: 10.5897/AJPS2016.1416 –

https://academicjournals.org/journal/AJPS/article-full-text-pdf/8178F6B58993

Stomata in Abrus (Fabaceae)

Photo credit: Google

Abrus precatorius – Rosary Pea, Rosarypea, Precatory Bean, Jequirity Pea, Bead Vine

Photo credit Google – Abrus precatorius – https://upload.wikimedia.org/wikipedia/commons/thumb/9/94/Abrus_precatorius_seeds.jpg/250px-Abrus_precatorius_seeds.jpg

Leaf Epidermal Micromorphology in the Systematics of Abrus (Papilionaceae) in Parts of Tropical West Africa.

by Agbagwa I. O., Bosa E. O. (2006)

Ikechukwu O. Agbagwa,

Bosa E. Okoli

in Asian J. Pl. Sci.5: 41 – 49 – DOI: 10.3923/ajps.2006.41.49 –

http://scialert.net/abstract/?doi=ajps.2006.41.49

Abstract: 

Comparison of the leaf epidermis of three species (A. canescens Welw. ex Bak., A. precatorius L. and A. pulchellus Wall. ex Thw.) and a new collection of Abrus adanson (simply referred to as Abrus sp.) found in tropical West Africa was undertaken by simple microscopy.

The epidermal cells are irregular with wavy, sinuous or arcuate anticlinal walls, while the coastal cells are parallel, elongated and rectangular, terminating obliquely.

Six types of stomata: paracytic (laterocyclic), diacytic, anomocytic, anisocytic, staurocytic and contiguous, were observed in the species. Anomocytic stomata are absent in A. canescens.

The new collection Abrus sp., is distinguished from the other three species by its amphistomatic nature and possession of stomata in-groups of two or three bordered by six continuous subsidiary cells on its abaxial surface. It also has a Stomatal Index (SI) of 18.19, the highest in the genus.

The other species are hypostomatic. Simple unbranched trichomes (long and short category) occur on both leaf surfaces of the species except in the new collection Abrus sp. where trichomes are confined to the abaxial surface. Trichome Index (TI) of 3.79 on the abaxial surface of A. canescens was observed to be the highest in the genus.

Venation is of the camptodromous-brochidodromous type. Crystals are of common occurrence in the species.

The study was aimed at improving systematic information on the tropical West African species of Abrus, which is hitherto lacking and with the collection of a new species, stimulate interest on Abrus taxonomy and conservation in the region.

Stomata in Emilia (Asteraceae)

Photo credit: Google

Emilia coccinea (Sims) G.Don

 

The value of leaf micromorphological in the taxonomic delimitation of Emilia cass. (Asteraceae) species

by Ndukwu B. C., Agbagwa I. O. (2006)

Benjamin C. Ndukwu, Ikechukwu O. Agbagwa

in Global. J. Pure Appl. Sci. 1: 183- 187. – http://dx.doi.org/10.4314/gjpas.v12i2.16588 – 

http://www.ajol.info/index.php/gjpas/article/view/16588

Abstract

Studies were carried out on the leaf epidermis of the three species of Emilia: E. coccinea (Sims) G. Don, E. praetermissa Milne-Redhead, and E. sonchifolia (L) DC using light microscope.

Epidermal cells in the species are irregular with anticlinal wall pattern sinuous in E. coccinea, sinuous in E. sonchifolia, and straight to arcuate in E. praetermissa. Epidermal cell dimensions were highest in E. praetermissa with 52.50µm and 49.64µm for the length and breadth respectively.

The epidermis is hypostomatic with anomocytic stomata in all species, semi-contiguous to contiguous stomata in E. coccinea, and E. sonchifolia.

Stomata index (S.I), frequency and size differed in all species. While S.I of 34.80 in E. sonchifolia was the highest in the genus, E. coccinea had the lowest S.I of 21.90.

Stomata ledges occur in E. coccinea and E. praetermissa.

Simple unicellular trichomes were observed only on the abaxial surface of E. coccinea.

The usefulness of these data to the taxonomic delimitation of the Emilia is discussed.

Stomata in Abrus (Fabaceae)

 

Leaf epidermal micromorphology in the systematics of Abrus (Papilionaceae) in parts of tropical West Africa.

by Agbagwa I.O., Okoli B. E. (2006)

Ikechukwu O. Agbagwa, Bosa E. Okoli,

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in  Asian J. Plant Sci., 5: 41-49 – DOI: 10.3923/ajps.2006.41.49

URL: http://scialert.net/abstract/?doi=ajps.2006.41.49
CrossRef  |  Direct Link  |  

Abstract: Comparison of the leaf epidermis of three species (A. canescens Welw. ex Bak., A. precatorius L. and A.pulchellus Wall. ex Thw.) and a new collection of Abrus adanson (simply referred to as Abrus sp.) found in tropical West Africa was undertaken by simple microscopy.

The epidermal cells are irregular with wavy, sinuous or arcuate anticlinal walls, while the coastal cells are parallel, elongated and rectangular, terminating obliquely.

Six types of stomata: paracytic (laterocyclic), diacytic, anomocytic, anisocytic, staurocytic and contiguous, were observed in the species. Anomocytic stomata are absent in A. canescens. The new collection Abrus sp., is distinguished from the other three species by its amphistomatic nature and possession of stomata in-groups of two or three bordered by six continuous subsidiary cells on its abaxial surface.

It also has a Stomatal Index (SI) of 18.19, the highest in the genus. The other species are hypostomatic. Simple unbranched trichomes (long and short category) occur on both leaf surfaces of the species except in the new collection Abrus sp. where trichomes are confined to the abaxial surface.

Trichome Index (TI) of 3.79 on the abaxial surface of A. canescens was observed to be the highest in the genus. Venation is of the camptodromous-brochidodromous type. Crystals are of common occurrence in the species. The study was aimed at improving systematic information on the tropical West African species of Abrus, which is hitherto lacking and with the collection of a new species, stimulate interest on Abrus taxonomy and conservation in the region.

See the text: Science Alert