Chromosomes of Taxus, Sequoia, Cryptomeria and Thuya

Dark, S. O. S.

doi:10.1093/oxfordjournals.aob.a090364

Cited by 22 publications

(10 citation statements)

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“…Heilborn (1934) interstitial chiasmata are not universally present in gymnosperms. Dark (1932) found many of the chiasmata to be terminal, and similar observations have been made by Khoshoo (1957) Hirayoshi and Nakamura, 1943;Stebbins, 1948) in gymnosperms. In these cases multivalents contribute to the sterility.…”

Section: Causes Of Rarity Of Polyploidssupporting

confidence: 79%

Polyploidy in Gymnosperms

Khoshoo¹

1959

Evolution

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Section: Causes Of Rarity Of Polyploidssupporting

confidence: 79%

Polyploidy in Gymnosperms

Khoshoo¹

1959

Evolution

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“…However, no cultivars were named and it is unclear if the reference is to the chance triploids and tetraploids found in Japan (Chiba, 1951) or specific cultivars with which the author was familiar. In contrast to reports of a base number of 11 for Cryptomeria japonica (Khoshoo, 1961;Sax and Sax, 1933), Dark (1932) reported a base chromosome number of 12, which is common in other genera of conifers. The report by Dark (1932) is the only report of a base chromosome number differing from 11 for japanese-cedar and appears to be an error.…”

Section: Resultscontrasting

confidence: 79%

“…In contrast to reports of a base number of 11 for Cryptomeria japonica (Khoshoo, 1961;Sax and Sax, 1933), Dark (1932) reported a base chromosome number of 12, which is common in other genera of conifers. The report by Dark (1932) is the only report of a base chromosome number differing from 11 for japanese-cedar and appears to be an error. Based on flow cytometry, we thought that 'Viridis' might be an aneuploid (e.g., 2n + 2) because it was among the cultivars with a genome size statistically different from the majority of cultivars in the study.…”

Section: Resultscontrasting

confidence: 79%

Differences in Winter Browning among Japanese-cedar Cultivars Are Not Due to Variation in Ploidy Levels

Contreras¹,

Determann²,

Friddle³

2011

horts

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There is a great deal of variation among japanese-cedar cultivars with regard to growth form, foliar characteristics, and winter browning. Differences in winter browning have been observed and documented by a number of authors. Previous research has established that there are differences in winter foliage color between cultivars included in the current study; however, no quantitative analysis under standardized conditions was conducted. Because of a previous report that tetraploid forms of japanese-cedar remain green during winter as a result of increased antioxidant enzyme activity, we hypothesized that cultivars that exhibit reduced winter browning were polyploids. We screened 56 accessions of japanese-cedar using flow cytometry analysis of 4′,6-diamidino-2-phenylindole (DAPI)-stained nuclei and performed chromosome counts on three cultivars. All accessions were diploid (2n = 2x = 22), although there were significant differences in genome sizes among the cultivars. Holoploid genome sizes ranged from 18.9 pg for var. sinensis JCRA to 22.3 pg for ‘Viridis’ with a mean of 20.1 pg. Chromosome counts for cultivars Ogon, Oye Keme, and Viridis supported the flow cytometry results. Although the underlying cause of the variability in morphology and winter browning among cultivars is unclear, our results show that differences in ploidy level are not responsible, because all tested genotypes were diploid. Chemical name: 4′,6-diamidino-2-phenylindole (DAPI).

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“…There is some evidence of swelling of the chromo Table 1 somes between prophase and metaphase, similar to that described by Dark (1932) in Taxus. When the chromosomes become orientated on the plate at metaphase, the position of the attachments is clearly visible, both by the pre sence of definite constric tions and by their being the points of maximum re pulsion between the pair ed chromosomes.…”

Section: Observations On Spermatocyte Divisionssupporting

confidence: 80%

The Origin and Behaviour of Chiasmata XIII

Moffett

1936

cytologia

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Chromosomes of Taxus, Sequoia, Cryptomeria and Thuya

Cited by 22 publications

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Polyploidy in Gymnosperms

Polyploidy in Gymnosperms

Differences in Winter Browning among Japanese-cedar Cultivars Are Not Due to Variation in Ploidy Levels

The Origin and Behaviour of Chiasmata XIII

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