Chromosomes and Crossing Behavior of some Species of Sansevieria

Menzel, Margaret Y.; Pate, James B.

doi:10.2307/2439255

Cited by 3 publications

(6 citation statements)

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“…This may indicate a possible structural alteration involving the two homologues. Similar unequal associations were noticed by Menzel and Pate (1960) in polyploid species and they felt that the unequal multivalents were the result of structural alterations. At meta phase I, there was a tendency for precocious separation of bivalents in most of the taxa.…”

Section: Discussionsupporting

confidence: 58%

“…The role of hybridisation and polyploidy in the evolution of Sansevieria has been discussed by Menzel and Pate (1960) and Sharma and Chaudhuri (1964). Menzel and Pate (1960) obtained fertile bybrids in interspecific crosses involving diploid species and also between diploid and tetraploid species.…”

Section: Discussionmentioning

confidence: 99%

“…Menzel and Pate (1960) obtained fertile bybrids in interspecific crosses involving diploid species and also between diploid and tetraploid species. Interspecific hy bridisation has also been reported by various workers like Pate et al (1954Pate et al ( , 1960, Wilson et al (1962), etc.…”

Section: Discussionmentioning

confidence: 99%

“…Irrespective of wide morphological variation among species, the chromosomes have little genetic differentiation. The speciation at diploid level has occurred principally through mutation and hybridisation accompanied by in complete barriers to crossability (Menzel and Pate 1960). The polyploids have ari sen principally through segmental alloploidy which has been successful despite the low level of chromosome differentiation in the genus, because the various diploid genomes, though similar, are sufficiently differentiated to exhibit preferential pairing in polyploids.…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Cytology of some species of Sansevieria thunb.

Nazeer

Khoshoo

1984

CYTOLOGIA

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Cytology of some species of Sansevieria thunb.

Nazeer

Khoshoo

1984

CYTOLOGIA

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“…The short phylogenetic distance between Sansevieria species and the easy occurrence of (artificial) hybridization (Pate et al, 1954; Menzel and Pate, 1960), invoke doubt about whether or not gene flow still occurs between some of the described species. For example, Pfennig (1979) suggested that D. powellii may be a natural hybrid of D. perrotii and D. arborescens (Cornu ex Gérôme & Labroy) Byng & Christenh., as it arose in regions where the two species are sympatric.…”

Section: Discussionmentioning

confidence: 99%

Plastid phylogenomics of theSansevieriaclade (Dracaena; Asparagaceae) resolves a rapid evolutionary radiation

Kleinwee

Larridon

Shah

et al. 2021

Preprint

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Sansevierias are a diverse group of flowering plants native to Africa, Madagascar, the Arabian Peninsula and the Indian subcontinent, popular outside their native range as low maintenance houseplants. Traditionally recognized as a distinct genus, Sansevieria was recently merged with the larger genus Dracaena based on molecular phylogenetic data. Within the Sansevieria clade, taxonomic uncertainties remain despite numerous attempts to classify the species. We aim to arrive at a robust phylogeny using a plastid phylogenomic approach, and estimate a time-frame of diversification to infer the evolutionary history of the group, including geographical and morphological evolution. Molecular data was obtained using genome skimming for 50 Sansevieria, representing all informal groups previously instated based on morphology, and two Dracaena sensu stricto species. The resulting Maximum Likelihood phylogenetic hypotheses are generally well supported, except for some very short branches along the backbone of the tree. The time-calibrated phylogeny indicates a recent rapid radiation with the main clades emerging in the Pliocene. Two well-supported clades align with previously defined informal groups, i.e., Sansevieria section Dracomima, characterised by the Dracomima-type inflorescence, and the Zeylanica group, native to the Indian subcontinent. Other morphologically defined informal groups are shown to be polyphyletic: a pattern due to convergent evolution of the identifying characters. Cylindrical leaves arose multiple times independently in the evolution of the Sansevieria clade and similarly, the Cephalantha-type inflorescence has originated multiple times from an ancestor with a Sansevieria-type inflorescence. To provide a more accessible tool for species identification and delimitation, genes and spacer regions were screened for variability and phylogenetic informativeness to investigate their potential as chloroplast DNA barcodes. Candidate chloroplast DNA barcodes include the trnH-rpl12, ndhH-rps15, psbE-petL, psbT-psbN, rps18-rpl20 intergenic spacers, the chloroplast gene rps8 and the first intron of ycf3.

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A possible role for the synaptonemal complex in chiasma maintenance

Maguire

1978

Experimental Cell Research

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Chromosomes and Crossing Behavior of some Species of Sansevieria

Cited by 3 publications

References 0 publications

Cytology of some species of Sansevieria thunb.

Cytology of some species of Sansevieria thunb.

Plastid phylogenomics of theSansevieriaclade (Dracaena; Asparagaceae) resolves a rapid evolutionary radiation

A possible role for the synaptonemal complex in chiasma maintenance

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