Taxonomic implications of genome size and pollen colour and vitality for species of Agapanthus L?H�ritier (Agapanthaceae)

Zonneveld, B. J. M.; Duncan, Graham

doi:10.1007/s00606-003-0038-6

Cited by 32 publications

(18 citation statements)

References 9 publications

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“…All species within the genus Agapanthus L'Heritier (Agapanthaceae) are diploid (Zonneveld and Duncan 2003), as shown by the results of the present study -both in vivo and in vitro (two-week-old and three-week-old) A. praecox ssp. minimus were found to be diploid.…”

Section: Resultssupporting

confidence: 49%

“…All plants within the genus Agapanthus have the same number of chromosomes, therefore implying the importance of studies on nuclear DNA content to elucidate any differences between taxa (Ohri 1998). Zonneveld and Duncan (2003) and Riley and Mukerjee (1960) revealed that all species of the genus Agapanthus L'Heritier (Agapanthaceae) had 30 chromosomes (2n = 2x = 30), except four Agapanthus sp. that are triploid, including A. inapertus sp.…”

Section: Resultsmentioning

confidence: 99%

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Genetic stability ofin vitropropagated African blue lily (Agapanthus praecoxssp.minimus)

Yaacob

Taha

2014

Caryologia

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The present study presents cytological investigations of meristematic root cells of African lily (Agapanthus praecox ssp. minimus) grown in vivo and in vitro. Cellular parameters including mitotic index (MI), chromosome count and ploidy level (nuclear DNA content) were determined from 12 mm root tip segments of this species. The MI value was found to increase when cells were transferred from in vivo to in vitro conditions, perhaps due to early adaptations of cells to in vitro environment. However, addition of plant hormones in the culture medium was found to increase the MI values recorded for root cells grown in vitro. The mean chromosome number was generally stable (2n = 2x = 30) throughout the five-week culture period, indicating no occurrence of early somaclonal variation. Ploidy level analysis revealed that A. praecox root cells contained a high percentage of polyploid cells when grown in vitro after prolonged culture period. This showed that Agapanthus praecox ssp. minimus was not genetically stable when cultured in vitro, especially when subjected to prolonged culture period.

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Section: Resultssupporting

confidence: 49%

Section: Resultsmentioning

confidence: 99%

Genetic stability ofin vitropropagated African blue lily (Agapanthus praecoxssp.minimus)

Yaacob

Taha

2014

Caryologia

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“…Nuclear DNA content which can conveniently be measured by flow cytometry using propidium iodide (PI), a stoichiometric DNA stain that intercalates in the double helix, is more and more exploited for taxonomic purposes. Where many species in a genus have the same chromosome numbers, differences in nuclear DNA content, when present, have proven to be very effective in delimiting infrageneric divisions in a number of taxa [7][8][9][10][11][12][13][14][15][16][17][18]. Flow cytometry can therefore be considered as a quick and useful method for understanding systematic relationships.…”

Section: Introductionmentioning

confidence: 99%

Genome Sizes in Hepatica Mill: (Ranunculaceae) Show a Loss of DNA, Not a Gain, in Polyploids

Zonneveld

2010

Journal of Botany

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Genome size (C-value) was applied anew to investigate the relationships within the genus Hepatica (Ranunculaceae). More than 50 samples representing all species (except H. falconeri), from wild and cultivated material, were investigated. Species of Hepatica turn out to be diploid (), tetraploid ( ), and a possible pentaploid. The somatic nuclear DNA contents (2C-value), as measured by flow cytometry with propidium iodide, were shown to range from 33 to 80 pg. The Asiatic and American species, often considered subspecies of H. nobilis, could be clearly distinguished from European H. nobilis. DNA content confirmed the close relationships in the Asiatic species, and these are here considered as subspecies of H. asiatica. Parents for the allotetraploid species could be suggested based on their nuclear DNA content. Contrary to the increase in genome size suggested earlier for Hepatica, a significant (6%–14%) loss of nuclear DNA in the natural allopolyploids was found.

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“…Leight. However, based on the nuclear DNA content and pollen morphology as well as vitality, Zonneveld and Duncan [3] recognized six species in total comprising of two evergreen species which are A. africanus (L.) Hoffmanns and A. praecox Willd. and four deciduous species, A. campanulatus F.M.…”

Section: Introductionmentioning

confidence: 99%

Micromorphological Characterization of the Leaf and Rhizome of Agapanthus praecox subsp. praecox Willd. (Amaryllidaceae)

Sharaibi

Afolayan

2017

Journal of Botany

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Agapanthus praecox subsp. praecox Willd. is a highly valued medicinal plant of family Amaryllidaceae. The genus Agapanthus has been difficult to classify into distinct species due to broad similar morphology of its members. Present taxonomic confusion in this genus and numerous medicinal uses of A. praecox necessitate its proper identification. The leaf and rhizome microcharacters were studied using scanning electron, light microscopy, and energy dispersive X-ray spectroscopy. Epidermal cells are polygonal having wavy anticlinal walls with mean adaxial length of 80.04 ± 0.5 m and mean abaxial length of 85.33 ± 0.6 m. The leaf is amphistomatic with anomocytic stomata with mean pore length of 22.14 ± 0.2 m on the adaxial and 15.02 ± 0.3 m on the abaxial surface. The mean stomata densities on the adaxial and abaxial surfaces were 280.5 ± 0.5 mm 2 and 350.6 ± 0.6 mm 2 . Trichomes and secretory ducts are absent on both surfaces. EDX spectroscopy showed that beryllium, carbon, oxygen, sodium, and silicon were present on both epidermal surfaces and rhizome while nitrogen, aluminum, and chlorine were detected only on the adaxial surface and sulphur was detected only in the rhizome.

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Taxonomic implications of genome size and pollen colour and vitality for species of Agapanthus L?H�ritier (Agapanthaceae)

Cited by 32 publications

References 9 publications

Genetic stability ofin vitropropagated African blue lily (Agapanthus praecoxssp.minimus)

Genetic stability ofin vitropropagated African blue lily (Agapanthus praecoxssp.minimus)

Genome Sizes in Hepatica Mill: (Ranunculaceae) Show a Loss of DNA, Not a Gain, in Polyploids

Micromorphological Characterization of the Leaf and Rhizome of Agapanthus praecox subsp. praecox Willd. (Amaryllidaceae)

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