Cross-Ability in the Genus Lachenalia

Kleynhans, R.; Spies, J. J.; Spies, Paula

doi:10.17660/actahortic.2009.813.49

Cited by 6 publications

(4 citation statements)

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“…In the present study, the A-T rich regions due to DAPI bands and the positions of 5S rDNA and 18S rDNA signals confirmed that there were several morphological alterations of chromosomes in the taxa of x=7. Kleynhans et al (2009) revealed that cross-hybridization among the Lachenalia species with same basic chromosome numbers occurred easily. The diversity in the taxa of x=7 studied descended from the transformations influencing hereditarily between their ancestral species which underwent morphological alterations on their chromosomes.…”

Section: Discussionmentioning

confidence: 99%

Chromosome relationships among 13 species and one variety of Lachenalia (Liliaceae) with the chromosome numbers of 2n=14 and 16 detected by FISH using 5S rDNA and 18S rDNA probes and DAPI staining

Hamatani¹,

Tagashira

Ishida³

et al. 2009

Chromosome Botany

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The structural comparison of somatic chromosomes of 13 species and one variety of Lachenalia (Liliaceae) that contained the chromosome numbers either of 2n=14 or 2n=16 (the basic chromosome numbers may be x=7 or x=8) was performed by DAPI staining and fluorescence in situ hybridization (FISH) using 5S rDNA and 18S rDNA probes. The five taxa which had the chromosome number of 2n=16 (x=8) displayed similar characters and close relationships to each other. Eight species and one variety which had the chromosome number of 2n=14 (x=7) showed a variety of patterns. The cases were suggested as traces of additions to the 18S rDNA region, translocations of chromosomes and hereditary exchanges among the taxa with x=7 and a taxa with x=8. It was suggested that the chromosome diversity in Lachenalia, especially in the taxa of basic chromosome number of x=7, was resulting a speciation reflected by hereditary influences between the taxa which had other patterns of chromosome structures.

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Section: Discussionmentioning

confidence: 99%

Chromosome relationships among 13 species and one variety of Lachenalia (Liliaceae) with the chromosome numbers of 2n=14 and 16 detected by FISH using 5S rDNA and 18S rDNA probes and DAPI staining

Hamatani¹,

Tagashira

Ishida³

et al. 2009

Chromosome Botany

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“…The high level of floral diversity in Lachenalia (tubular, narrowly or widely bell‐ or urn‐shaped) is probably associated with its use of diverse pollinators, with three pollination syndromes being recognized: mellitophily, ornithophily and generalist pollination, the latter including monkey beetles, blister beetles, hoverflies, march flies, butterflies and day‐flying moths (Duncan, 2012; Duncan et al, 2022). An extraordinary level of cytological variation occurs within Lachenalia , including differences in basic chromosome number, variable ploidy levels and the presence of B‐chromosomes (supernumary chromosomes) in certain species (Kleynhans et al, 2012). Remarkably, there appears to be a very low incidence of natural hybridisation, with only one record of a natural hybrid between two long‐tubed, sunbird‐pollinated species, the orange‐flowered L. callista G.D.Duncan & T.J.Edwards, and the turquoise‐and‐green‐flowered L. vanzyliae (W.F.Barker) G.D.Duncan.…”

Section: Figurementioning

confidence: 99%

“…This very low incidence of natural hybridisation may be a reflection of the importance of differences in chromosome number, pollinator type, phenology and habitat preference as breeding barriers (Duncan, 2005(Duncan, , 2012. However, several commercial hybrids have been raised in breeding experiments, in which cytogenetic and phylogenetic data have played an essential role (Kleynhans et al, 2012).…”

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1059. Lachenalia bolusii W.F. Barker: Asparagaceae

Duncan

2023

Curtis's Botanical Magazine

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“…The extremely low incidence of natural hybrids may reflect the importance of differences in chromosome number, pollinator type, flowering phenology and habitat preference as breeding barriers (Duncan, 2005(Duncan, , 2012a. Several horticulturally outstanding species have, however, been crossbred in cultivation, with cytogenetic and phylogenetic data playing an essential role in guiding crossbreeding strategies (Kleynhans & al., 2009(Kleynhans & al., , 2012.…”

Section: ■ Introductionmentioning

confidence: 99%

A new sectional classification of Lachenalia (Asparagaceae) based on a multilocus DNA phylogeny

Duncan

Schlichting

Forest

et al. 2022

TAXON

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Lachenalia (Asparagaceae; Scilloideae; Hyacintheae) is a large and morphologically diverse genus of more than 140 bulbous species endemic to southern Africa. Previous attempts to infer a well-resolved and robustly supported phylogeny of Lachenalia using Sanger sequencing of candidate loci and/or morphological characters have been largely unsuccessful. Consequently, the current infrageneric classification is artificial, and there is a need to explore alternative avenues to produce a phylogenetic classification. In this paper, we present a novel phylogenetic hypothesis for Lachenalia inferred using maximum likelihood and coalescent-based species tree estimation (ASTRAL) as applied to 378 hybrid-enrichment loci. Our tree is well resolved and well supported, providing strong support for a monophyletic radiation of the genus in southern Africa and a solid foundation for a revised infrageneric classification. The well-supported placement of L. isopetala Jacq. as sister to Lachenalia + Massonia supports the establishment of a new monotypic genus, Pseudolachenalia, to accommodate this species. Conversely, the inclusion of species previously classified as Polyxena within the Lachenalia clade supports the transfer of these species to Lachenalia. Within Lachenalia, the delimitation of subgenera and sections is complicated by the highly imbalanced character of the phylogeny and by the high levels of homoplasy shown by most morphological characters traditionally used to delimit species in this group. Nonetheless, we propose an infrageneric taxonomy comprising 10 morphologically distinct, monophyletic sections. The largest of these, L. sect. Lachenalia, is further divided into 13 more-or-less diagnosable, monophyletic subsections. Keys to the sections of Lachenalia, and to the subsections of L. sect. Lachenalia, are provided.

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Cross-Ability in the Genus Lachenalia

Cited by 6 publications

References 0 publications

Chromosome relationships among 13 species and one variety of Lachenalia (Liliaceae) with the chromosome numbers of 2n=14 and 16 detected by FISH using 5S rDNA and 18S rDNA probes and DAPI staining

Chromosome relationships among 13 species and one variety of Lachenalia (Liliaceae) with the chromosome numbers of 2n=14 and 16 detected by FISH using 5S rDNA and 18S rDNA probes and DAPI staining

1059. Lachenalia bolusii W.F. Barker: Asparagaceae

A new sectional classification of Lachenalia (Asparagaceae) based on a multilocus DNA phylogeny

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