MEIOSIS IN SOME SPECIES AND A HYBRID OF PAEONIA

Hicks, G. C.

doi:10.1002/j.1537-2197.1934.tb04958.x

Cited by 18 publications

(2 citation statements)

References 13 publications

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“…Данные о геномном составе видов рода Paeonia, полученные с использованием классического цитогенетического анализа, весьма ограничены. Это обусловлено трудностями получения отдаленных гибридов, большими размерами растений и длительным жизненным циклом, в котором продолжительность периода от посева семян до цветения составляет 5-6 лет (Hicks, Stebbins, 1934). Результаты ботанических исследований и данные молекулярно-генетического анализа свидетельствуют о том, что в процессах видообразования в роде Paeonia ведущую роль играла ретикулярная (сетчатая) эволюция.…”

Section: классификация пионов их ботаническая и генетическая характер...unclassified

Achievements in world and domestic breeding of peonies (Paeonia L.)

Ivanov,

Vasilyeva,

Anisimova

et al. 2024

Biotehnologiâ i selekciâ rastenij

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The genus Paeonia L. includes both popular ornamental and medicinal plants with a rich history of cultivation and breeding. Breeding is an important process of increasing the diversity of the assortment and creating new cultivars of peonies with various economically important characteristics, such as the shape and color of flowers, different flowering periods and resistance to diseases and abiotic stressors. The main methods used in the breeding of peonies are traditional methods, including intraspecific, interspecific and intersectional hybridization, however, such factors as a long reproduction cycle and the complexity of the breeding process limit the possibilities for good progress in this work. The application of methods of biotechnology and molecular genetics make the breeding process more efficient. The use of germplasm resources and hybridization will accelerate the process of creating new cultivars not only with various decorative features, but also those with high adaptability to biotic and abiotic factors and resistance to phytopathogens and diseases. This review highlights the history of domestic and foreign breeding, modern trends and methodology of peony breeding. Information is provided on the achievements and limitations that exist in the field of molecular biological study of peonies.

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Section: классификация пионов их ботаническая и генетическая характер...unclassified

Achievements in world and domestic breeding of peonies (Paeonia L.)

Ivanov,

Vasilyeva,

Anisimova

et al. 2024

Biotehnologiâ i selekciâ rastenij

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show abstract

“…Die Untersuchungen vonHICKS and STEBBINS (1934) und STEBBINS (1938) lassen nicht allzuviel Schlfisse zu, da nach ihnen in diesem Bastard h6ehstens leichte Tendenzen zum Paarungsausfall bestehen sollen. Die Genome der Arten haben also noch so wenig Gemeinsamkeiten, dab sie nur noch in geringem Ausmal3 paarungsEihig sind; wir sprechen in solchen F~illen yon Allopolyploidie.…”

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Cytogenetik bei Zierpflanzen

Propach¹

1939

Der Züchter

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Fragmentation in Tradescantia

Whitaker

1936

American J of Botany

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life cycle, except for an occasional case of nondisjunction at meiosis.The meiotic behavior of the chromosomes was studied in 100 cells from plants having only one pair of fragments. These data are summarized below and in the following paragraphs. '.92 noo 8.00 Fragments none Normal bivalents 2.4 23.44 Average chiasma frequency . (Ic, of interstitial chiasmata . % unpaired .AMONG A group of Tradescantia 2 plants collected from Gentilly, Louisiana, by Small, Anderson and Woodson, there appeared a number of individuals having in addition to the usual diploid complement of 12 chromosomes, a varying number of fragments. When a preliminary examination indicated that the number of fragments in the somatic tissue seemed to che?k with the number found at meiosis, an opportumty was presented for studying the behavior of these fragments under rather stable conditions. The technique developed by Sax and Humphrey (1934) for demonstrating the internal structure of the chromosome offers a refined method for investigating the morphology of fragments. With the ordi-The normal bivalents show the usual chiasma frenary smear methods (either aceto-carmine or per-quency, and the percentage of interstitial chiasmata rnanent) and paraffin sectioned material, the frag-characteristic of the species. The fragment chromoments appear as small, darkly-stained blobs; with somes pair almost as regularly as the normal chromothe alcohol-alkaline pre-treatment method, structural somes. The chiasma frequency per unit of pairing features that are visible in the major chromosomes length in the paired fragments is more than twice are also evident in the fragments ( fig. 3, 4).that of the normal bivalents. The fragments form The len~th of the fragments found in this group either terminal or interstitial chiasmata, although of plants IS roughly one-sixth to one-seventh that of the latter are not nearly so numerous as they are in the major chromosomes. Thev seem to be of rather the ordinary bivalents. uniform length regardless of' the number found inThe types of configurations found in the paired a single cell. In respect to their size thev differ from fragments a.re illustrated in the diagrams of figure 2, he fragments studied by Lesley and L'esley (1929) together with a regular rod bivalent. With the m the tomato. In this case, the fragments were technique used, the chromatids are well differentiated. about one-half the size of the major chromosomes. In the regular bivalents the two chromatids of each The fragments studied by Darlington (1929) in homologue are closely associated in a coiled chromo-Tradescantia and (l9;30) in Fritillaria, by Belling nema at early metaphase, and separate to form two (1925) . in Uuularia, and by Hicks and Stebbins coiled chromatids at late metaphase and anaphase.

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MEIOSIS IN SOME SPECIES AND A HYBRID OF PAEONIA

Cited by 18 publications

References 13 publications

Achievements in world and domestic breeding of peonies (<i>Paeonia</i> L.)

Achievements in world and domestic breeding of peonies (<i>Paeonia</i> L.)

Cytogenetik bei Zierpflanzen

Fragmentation in Tradescantia

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