The fate of ribosomal RNA genes in spontaneous polyploid dogrose hybrids [ Rosa L. sect. Caninae ( DC .) Ser.] exhibiting non‐symmetrical meiosis
نویسندگان
چکیده
منابع مشابه
Evolution by reticulation: European dogroses originated by multiple hybridization across the genus rosa.
The European dogroses (Rosa sect. Caninae (DC.) Ser.) are characterized by a unique meiosis system ("canina-meiosis"), which controls the heterogamous development of tetraploid egg cells and haploid pollen grains resulting in a pentaploid somatic status. This permanent anorthoploidy is supposed to have originated by a hybridization event in the postglacial period. In this study we present molec...
متن کاملTaxonomical study of section Caninae )Rosa) and their hybrids in Iran
The genus Rosa has a wide variety in Iran and although some natural hybrids have been found in different regions of the country, but no cultivars have been established so far. In order to optimize use of genetic resources in the country and to create varieties with desirable traits, inter-species relationships and identification of diversity, 45 populations from seven species in sectio...
متن کاملMicrosatellite analyses of artificial and spontaneous dogrose hybrids reveal the hybridogenic origin of Rosa micrantha by the contribution of unreduced gametes.
Dogroses are characterized by a unique meiosis system, the so-called canina meiosis, which facilitates sexual reproduction at odd-number ploidy. The mostly pentaploid somatic level of dogroses is restored by a merger of haploid sperm cells and tetraploid egg cells. We analyzed experimental hybrids between different dogrose species using microsatellites to determine pollen-transmitted alleles. T...
متن کاملمطالعه ریخت‌شناسی و ریزریخت‌شناسی در بخش Caninae، زیربخش Caninae، Rosa canina L.
در این بررسی، صفات ریخت‌شناسی و ریزریخت‌شناسی در فرم-سری‌های گونه Rosa canina L. مطالعه شد. در این گونه، به علت پراکنش وسیع و پتانسیل بالای هیبریداسیون با سایر گونه‌های این جنس، یافتن صفت ریخت‌شناسی ثابت برای شناسایی آن مشکل است. 30 صفت ریخت‌شناسی و 31 صفت تشریحی و ریزریخت‌شناسی مطالعه شد که با توجه به تنوع زیاد صفات، مخصوصاً چهار صفت: کُرک برگچه، کُرک دمگل، غده برگچه و غده دمگل، این گونه به هشت ف...
متن کاملRecombination between Ribosomal Rna Genes
Previous workers have shown that intergeneric crosses between Salmonella typhimurium and Escherichia coli produce a high proportion of merodiploid recombinants among the viable progeny. We have examined the unequal crossover event that was responsible for a number of intergeneric merodiploids. The merodiploids that we studied were all heterozygous for the metB-argH interval and were the product...
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ژورنال
عنوان ژورنال: The Plant Journal
سال: 2018
ISSN: 0960-7412,1365-313X
DOI: 10.1111/tpj.13843