Aspects of Chromosome Evolution in Higher Plants

Jones, Keith

doi:10.1016/s0065-2296(08)60330-4

Cited by 64 publications

(41 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the karyotypes of the genus Lycoris, three major types of chromosomes are identified: A (acrocentric), M (metacentric), and T (telocentric). It is likely that the basic chromosome number of 11 is the primitive type, and the total arm number of any species is always a multiple of 11 (Inariyama, 1931;1951;Jones, 1978). However, it is still unsolved whether a successive decrease in the chromosome number via centric fusion or increase by centric fission has been the essential mechanism for karyotype evolution and speciation in the genus Lycoris (Hsu et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Genetic variations in the chloroplast genome and phylogenetic clustering of Lycoris species

Hori¹,

Hayashi²,

Sasanuma

et al. 2006

Genes Genet. Syst.

View full text Add to dashboard Cite

The genus Lycoris of Amaryllidaceae comprises approximately 20 species that are distributed only in the moist warm temperate woodlands of eastern Asia. The objectives of this study were: (1) to clarify the phylogeny of the Lycoris species by using the definitive DNA sequencing method and (2) to examine the possible maternal donor of the hybrid origin Lycoris species and the Japanese triploid strains of Lycoris radiata var. radiata. The nucleotide sequence of the maturase K ( matK ) gene and the noncoding intergenic spacer (IGS) between the atpB and rbcL genes in the chloroplast genome were determined in a total of 27 strains of 11 species of the genus Lycoris. Variation among taxa was mainly due to nucleotide substitution, although deletions and an insertion were found in the IGS. For two chloroplast regions, the phylogenetic trees showed essentially similar topology, indicating the existence of four clades, I, II, III, and IV. For all the species except L. radiata , intraspecific variation was smaller than interspecific variation. For L. radiata , triploid strains were divided into clades I and II, and diploid strains were divided into clades I and IV. This implies that the diploid species of L. radiata var. pumila is a probable ancestral species. The clustering indicated that the chloroplast genome has not evolved in parallel with the karyotype in genus Lycoris . Regarding the hybrid origin species, the maternal parents of L. squamigara , L. albiflora and L. rosea were revealed to be L. longituba , L. radiata and L. radiata var pumila , respectively. We also suggest that a diploid strain of L. radiata var. pumila in clade I might be a candidate of the maternal donor of the Japanese triploid strains. A possible model of the maternal donor of Lycoris species is proposed.

show abstract

Section: Discussionmentioning

confidence: 99%

Genetic variations in the chloroplast genome and phylogenetic clustering of Lycoris species

Hori¹,

Hayashi²,

Sasanuma

et al. 2006

Genes Genet. Syst.

View full text Add to dashboard Cite

show abstract

“…Polyploid and aneuploid cytotypes are known in many Liliaceae, including Scilla (Araki 1975, 1977, 1985, Araki et al 1986) and Polygonatum (Tamura 1990). Heteromorphic bivalents and/or bridges with or without fragment reflect structural changes such as heterozygous inversions, Robertsonian translocations, exchanges, deletions and duplications (Brandham 1970, Brandham and Johnson 1977, Jones 1978, Jones et al 1975, Kenton 1981, Palomino and Vazquez 1991). The heteromorphic chromosomes we observed in all populations we studied, also the quadrivalents, both ring and chains, we observed in the two (Brandham 1976).…”

Section: Discussionmentioning

confidence: 99%

Cytotypes and Meiotic Behavior in Mexican Populations of Three Species of Echeandia(Liliaceae).

Palomino

Martínez

1994

CYTOLOGIA

View full text Add to dashboard Cite

“…In many plant taxa, modification of chromosomes structure is frequently due to Robertsonian rearrangements (Stebbins 1971, Jones 1978, Marks 1983, even though it has been proposed that the significance of this event is a b confined (Jones 1998). In our studies, chromosomal restructurations this kind have been observed in some species of Orchidaceae, tribe Neottieae.…”

Section: Discussionmentioning

confidence: 99%

Karyomorphology and Evolution in Italian Populations of Three Neottieae Species (Orchidaceae).

D’Emerico¹,

Pignone²,

Scrugli

2000

CYTOLOGIA

View full text Add to dashboard Cite

Summary A karyological analysis on Italian populations of 3 species, belonging to the genera Cephalanthera and Listera (Orchidaceae: Neottieae tribe) and characterized by asymmetrical karyotypes, was undertaken. Karyomorphological and C-banding data strongly suggest that in 2 species, namely C. damasonium and L. cordata, chromosomal rearrangements involving the large and medium-large chromosomes constituted the principal mechanism of chromosome evolution. This process is particularly evident in L. cordata, where karyotype evolution occurred by means of centric fission along with an increase in chromosome number and in the overall chromosomal heterochromatin content. Altogether the present observation on Italian specimens of the Neottieae corroborate previous proposals of a central role of Robertsonian rearrangements and quantitative heterochromatin variation in karyotype reorganization.

show abstract

Aspects of Chromosome Evolution in Higher Plants

Cited by 64 publications

References 79 publications

Genetic variations in the chloroplast genome and phylogenetic clustering of Lycoris species

Genetic variations in the chloroplast genome and phylogenetic clustering of Lycoris species

Cytotypes and Meiotic Behavior in Mexican Populations of Three Species of Echeandia(Liliaceae).

Karyomorphology and Evolution in Italian Populations of Three Neottieae Species (Orchidaceae).

Contact Info

Product

Resources

About