Chromosome Numbers of Rubus Species in Southwest China

Thompson, Maxine M.; Zhao, Chufeng

doi:10.17660/actahortic.1993.352.71

Cited by 12 publications

(13 citation statements)

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“…The three R. coreanus populations were all diploid, same as the previous reports by Pool et al (1981), Naruhashi (1991, 1998), Thompson and Zhao (1993) and Thompson (1995). Karyotypes of the three R. coreanus populations were all extremely similar and can be expressed as 2n = 29 = 14 = 12 m (2SAT) ?…”

Section: Description Of Karyotpessupporting

confidence: 84%

“…The six R. parvifolius populations included diploid, triploid, and tetraploids, as well as a had various ploidys with 29, 39, 49 and cytotype mixture of 29 and 49. The cytotype mixture is a new report, diploid, triploid, and tetraploid populations have previously been described (Naruhashi et al 2002;Naruhashi and Iwatsubo 1993;Thompson and Zhao 1993). The R. parvifolius population with the fewest seeds (accession R04-2) was triploid.…”

Section: Description Of Karyotpesmentioning

confidence: 93%

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Cytological and RAPD data revealed genetic relationships among nine selected populations of the wild bramble species, Rubus parvifolius and R. coreanus (Rosaceae)

Wang

Liu

BiFeng

et al. 2009

Genet Resour Crop Evol

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Rubus parvifolius L. and R. coreanus Miq. are the two morphologically distinct, endemic wild brambles in East Asia that may be useful in raspberry breeding and cultivar development. In this study, genetic relationships among a total of nine populations of these two species, collected from Sichuan Province in southwestern China, were investigated by cytological and RAPD analyzing. With the exception of ploidy levels, R. parvifolius and R. coreanus had similar cytological features. Six R. parvifolius populations included diploids, triploid, tetraploid, and mixed diploid-tetraploid cytotype plants; among them, the population that produced the fewest seeds was the triploid, while the three R. coreanus populations were all diploid. But obvious genetic differentiation between R. parvifolius and R. coreanus was revealed by RAPD markers, the Euclidean's GS coefficient generated by UPGMA cluster analysis between R. parvifolius and R. coreanus was only 0.442, about half of that observed within species. Both genetic relationships among these populations and the origin of polyploidy in R. parvifolius populations are also discussed.

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Section: Description Of Karyotpessupporting

confidence: 84%

Section: Description Of Karyotpesmentioning

confidence: 93%

Cytological and RAPD data revealed genetic relationships among nine selected populations of the wild bramble species, Rubus parvifolius and R. coreanus (Rosaceae)

Wang

Liu

BiFeng

et al. 2009

Genet Resour Crop Evol

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“…They also share some similar morphological characters (Yü et al, 1985 ; Lu and Boufford, 2003 ). It has been documented that these Idaeobatus species exhibited both sexual and asexual reproduction, and some species could freely hybridize with each other and could produce fertile hybrids (Iwatsubo and Naruhashi, 1991 , 1992 , 1993a , b , 1996 , 1998 ; Thompson and Zhao, 1993 ). This may partly cause their common morphology.…”

Section: Discussionmentioning

confidence: 99%

“…Rubus peltatus had common maternal ancestors with R. setchuenensis and R. hunanensis inferred from cpDNA tree (Figure 1 ). The species also shares some similar morphology, such as simple leaves and ovate stipules (Figure 1 , ), whereas cytogenetic research showed that it is diploid (Thompson and Zhao, 1993 ). Three suspected diploid species, Rubus fulvus, R. micropetalus , and R. paniculatus , have been reported to occur in this predominately polyploid section Malachobatus (Malik, 1965 ; Mehra and Dhawan, 1966 ; Subramanian, 1987 ).…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic Insights into Chinese Rubus (Rosaceae) from Multiple Chloroplast and Nuclear DNAs

Wang

Chen

et al. 2016

Front. Plant Sci.

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Rubus L. is a large and taxonomically complex genus, species of which exhibit apomixis, polyploidy, and frequent hybridization. Most of Chinese Rubus are assigned in two major sections, Idaeobatus and Malachobatus. To explore the phylogenetic relationships within Chinese Rubus, inferences upon three chloroplast DNA (rbcL, rpl20-rps12, and trnG-trnS), nuclear ribosomal ITS, and two low-copy nuclear markers (GBSSI-2 and PEPC) were deduced in 142 Rubus taxa from 17 subsections in 6 sections. nrITS and GBSSI-2 were the most informative among the six DNA regions assessed. Phylogenetic relationships within Rubus were well-resolved by combined nuclear datasets rather than chloroplast markers. The phylogenetic inferences strongly supported that section Idaeobatus was a polyphyletic group with four distant clades. All samples of sect. Malachobatus formed a monophyletic clade, in which R. tsangorum and R. amphidasys of sect. Dalibardastrum, and R. peltatus from subsection Peltati of sect. Idaeobatus were always nested. Rubus pentagonus (2n = 2x = 14) from subsect. Alpestres of sect. Idaeobatus was a sister group to the polyploid sect. Malachobatus, as well as the polytomy of three sect. Cyalctis members. This suggests that some polyploids of Malachobatus might originate from common ancestors, via polyploidization of hybrids between R. pentagonus and sect. Cylactis species. They had experienced species explosion in a short time. Section Dalibardastrum species have potential parental lineages from subsects. Moluccani and Stipulosi of sect. Malachobatus. Based on molecular phylogenies, we also provided recommendations for the taxonomic treatments of four taxa. In addition, our results showed certain incongruence between chloroplast and nuclear markers, which might be due to hybridization and introgression.

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“…Subgenus Malachobatus. Chromosome studies in the subgenus Malachobatus have been performed only recently Nybom, 1986;Thompson and Zhao, 1993), so that, currently, chromosome numbers are available for ≈37 species, all of which are polyploid (4x, 6x, 8x, and l4x), with 4x being the predominant ploidy level. In my study, I report chromosome numbers of 17 taxa-only three of these are new counts: R. hunanensis (4x), R. swinhoei (4x), and R. hillii (6x).…”

Section: Methodsmentioning

confidence: 99%

Chromosome Numbers of Rubus Species at the National Clonal Germplasm Repository

Thompson¹

1995

HortSci

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The U.S. Dept. of Agriculture, Agricultural Research Service, National Clonal Germplasm Repository (NCGR), Corvallis, Ore., maintains Rubus germplasm representing worldwide diversity of the genus. Chromosome numbers were counted for 201 plants representing 124 taxa (species and varieties). There are new reports for 42 taxa, confirmation for 72 previously reported, and 10 counts for plants unidentified to species. The basic chromosome number was seven, and ploidy levels ranged from 2x to 12x.

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Chromosome Numbers of Rubus Species in Southwest China

Cited by 12 publications

References 0 publications

Cytological and RAPD data revealed genetic relationships among nine selected populations of the wild bramble species, Rubus parvifolius and R. coreanus (Rosaceae)

Cytological and RAPD data revealed genetic relationships among nine selected populations of the wild bramble species, Rubus parvifolius and R. coreanus (Rosaceae)

Phylogenetic Insights into Chinese Rubus (Rosaceae) from Multiple Chloroplast and Nuclear DNAs

Chromosome Numbers of Rubus Species at the National Clonal Germplasm Repository

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