Karyological Studies in Some African Species of the Genus Sesbania (Fabaceae).

Abou-EI-Enain, M. M.; EI-Shazly, H. H.; El-Kholy, M. A.

doi:10.1508/cytologia.63.1

Cited by 9 publications

(7 citation statements)

References 23 publications

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“…Karyotype asymmetry based on the relation between the chromosome arms A1 (intrachromosomal asymmetry index) and length A2 (interchromosomal asymmetry index) was estimated using the equations of Zarco (1986). The latter two indices range from zero to one and give lower values when chromosomes tend to be metacentric (see Abou‐El‐Enain, El‐Shazly & El‐Kholy, 1998).…”

Section: Methodsmentioning

confidence: 99%

Chromosomal criteria and their phylogenetic implications in the genus Onobrychis Mill. sect. Lophobrychis (Leguminosae), with special reference to Egyptian species

Abou-El-Enain

2002

Botanical Journal of the Linnean Society

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Chromosome numbers and measurements were recorded in 22 individuals from six populations of six species of Onobrychis, including the Egyptian species and most representatives of section Lophobrychis. The basic number of chromosomes was either x = 7 or x = 8 and the chromosomes were medium to medium‐small, ranging in length, from c. 1.6 μm to 2.6 μm. Two new ploidy levels were found, 2n = 4x = 28 in O. bobrovii Grossh. and 2n = 4x = 32 in O. pulchella Schrenk. The origin of the chromosome numbers, geographical distribution and evolution of the species were assessed. Comparison of the data with those in the literature revealed that the observed interspecific variability among section Lophobrychis can be useful in taxonomic delimitation and demonstrates a complexity of evolution between the diploid and polyploid species. Section Lophobrychis has a comparatively highly derived organization and can be considered as a heterogeneous unit in the genus Onobrychis. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 2002, 139, 409–414.

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Section: Methodsmentioning

confidence: 99%

Chromosomal criteria and their phylogenetic implications in the genus Onobrychis Mill. sect. Lophobrychis (Leguminosae), with special reference to Egyptian species

Abou-El-Enain

2002

Botanical Journal of the Linnean Society

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“…This is reflected in the topology of both the NJ and UPGMA trees. This observation is correlated with intarspecific resemblances in karyotype features (Abou-El-Enain, et al, 1998;El-Shazly & Abou-El-Enain, 1999) and similarities in storage seed protein electrophoretic profiles (Saraswati et al, 1993;Badr et al, 1998). However, close inspection of AFLP profiles and of the topology of the distance trees shows more genetic diversity between different accessions of the same species that is not manifested in the karyotype features or seed protein electrophoretic profile.…”

Section: Resultsmentioning

confidence: 83%

“…Polyploidy was encountered in a number of species; 2n=24 was recorded in S. aculeata, S. formosa, S. grandiflora, S. sesban, S. tetraptera, and S. virgata, whereas 2n=28 was only found in S. pachycarpa. Detailed karyotypic data have been described for several species (Lubis et al, 1981;Parihar & Zadoo, 1987;Joshua & Bhatia, 1989;Heering & Hanson, 1993;Salimuddin, 1993;Forni-Martins et al, 1994;Abou-El-Enain et al, 1998;El Shazly & Abou-El-Enain, 1999).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity as revealed by AFLP fingerprinting and systematic relationships of species in Sesbania (Fabaceae)

El-Shazly

2006

Taeckholmia

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El-Shazly, H.H. 2006. Genetic diversity as revealed by AFLP fingerprinting and systematic relationships of species in Sesbania (Fabaceae). Taeckholmia 26: 105-120. Genetic diversity has been revealed, using AFLP finger printing, in 37 accessions representing 21 species of Sesbania. The AFLP data has been analyzed and distance trees, illustrating the relationships within and among species, have been constructed using UPGMA and neighbor joining (NJ) methods as implemented in the NTSYS-pc software. Both trees illustrated polymorphism between accessions of the same species, from different origins, but illustrated that intraspecific accessions have closer genetic affinity to each other than to other species. The NJ and UPGMA distance trees clearly delimited the species of the two subgenera Agati and Daubentonia as two separate groups from those in subgenus Sesbania. The AFLP data revealed considerable polymorphism among species of subgenus Sesbania that is not correlated with karyotype resemblances of species in this subgenus and their ability to cross. Based on AFLP data this subgenus may be regarded the center from which species in the other two subgenera have been derived. In the NJ tree S. quadrata and S. rostrata are distinguished from two large groups, but in the UPGMA tree S. quadrata is grouped with S. bispinosa and S. cannabina, whereas S. rostrata is grouped with S. exaltata in one of the NJ groups. The delimitation of species based on the analyses of AFLP data is discussed in the light of their systematic delimitation.

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“…Symmetrical karyotypes are considered more primitive than asymmetrical ones. The evolution of the latter from the former has been recorded in several genera, for example Crotalaria (Gupta and Gupta, 1978), Phaseolus (Sarbhoy, 1980), Sesbania (Abou-El-Enain et al, 1998) and several others. In the present study, high degrees of karyotype asymmetry; as indicated by A 1 value; are recorded in the annual species having longer chromosomes i.e.…”

Section: Discussionmentioning

confidence: 99%

Chromosomal criteria and taxonomic relationships in the genus Lathyrus (Fabaceae)

Abou-El-Enain

1999

Taeckholmia

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Taxonomic relationships in eight species belonging to five of the 13 currently recognized sections of the genus Lathyrus have been discussed and their phylogeny based on chromosomal criteria is suggested. A diploid number of 2n = 14 (x = 7) has been found in all species studied and thus x = 7 is confirmed as the basic number in the genus. Karyotypes of the examined species have metacentric and submetacentric chromosomes that are variable in length. The retention of L. pratensis in the section Pratensis is confirmed. The assignment of L. hirsutus to section Lathyrus and of L. cicera and L. sativus to section Clymenum are supported. The present data revealed that L. pratensis is the most likely ancestral type in the genus and that Layhyrus represents a natural monophyletic group in the tribe Vicieae.

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Karyological Studies in Some African Species of the Genus Sesbania (Fabaceae).

Cited by 9 publications

References 23 publications

Chromosomal criteria and their phylogenetic implications in the genus Onobrychis Mill. sect. Lophobrychis (Leguminosae), with special reference to Egyptian species

Chromosomal criteria and their phylogenetic implications in the genus Onobrychis Mill. sect. Lophobrychis (Leguminosae), with special reference to Egyptian species

Genetic diversity as revealed by AFLP fingerprinting and systematic relationships of species in Sesbania (Fabaceae)

Chromosomal criteria and taxonomic relationships in the genus Lathyrus (Fabaceae)

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