Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 27 (1978), S. 541-551 
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; potato ; ploidy ; gene-flow ; ‘triploid block’ ; crossability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The formation of triploids in 4x×2x crosses was studied in primitive potato varieties from the Andes of Peru and Bolivia. Triploid frequencies were as high as 80–100% in some crosses, although the actual number of seeds was low. The ‘triploid block’ varied according to the tetraploid parent, and was never entirely absent. The likelihood of triploid formation was studied in 4x×2x crosses where pollen from both tetraploids and diploids of known genotype was used. Even though the diploids were chosen for their non-production of 2n gametes, as detected in pollen grain size, 66% of the hybrids were tetraploid. The amount and probability of gene-flow between the tetraploid and diploid gene-pools, either directly through 2n gametes or through ‘triploid bridges’ was examined. Most of the 20 cultivars of S. x chaucha produced seed in crosses with tetraploids and diploids, although the fertility of the latter crosses was four times higher. The female fertility of some of the triploids thus allows them to exchange genes with the tetraploids and diploids, although gene-flow occurs more rapidly through direct transfer from diploids to tetraploids via 2n gametes.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1573-5060
    Keywords: Solanum ajanhuiri ; Solanum stenotomum ; Solanum megistacrolobum ; cultivated potatoes ; frost resistance ; wild x cultivated potato hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The origin and nature of the diploid cultivated potato species S. ajanhuiri Juz. et Buk. was studied. Several lines of evidence indicate that S. ajanhuiri might be derived from natural crosses between primitive cultivars of the diploid species S. stenotomum and the wild species S. megistacrolobum. Morphological comparisons were made between S. stenotomum x S. megistacrolobum F1 hybrids and naturally occurring S. ajanhuiri to investigate this hypothesis. Comparisons were also made between S. ajanhuiri x S. stenotomum crosses and the F2 generation of the first-mentioned cross. Crosses between the two major groups of S. ajanhuiri cultivars, Ajawiri and Yari, showed not only genetic breakdown but also a wide range of phenotypic variation similar to those of artificial F2 families of S. stenotomum x S. megistacrolobum. Furthermore, there was strong evidence showing that the Yari group of S. ajanhuiri could almost certainly be an F1 S. stenotomum x S. megistacrolobum hybrid, whereas the Ajawiri group could be a backcross of an F1 hybrid to S. stenotomum. These results added further support to the hypothesis of a hybrid origin of S. ajanhuiri, as well as indicating its putative parents. It is suggested that this hybridogenic taxon be retained at the species level under the name Solanum x ajanhuiri.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The triploids recovered from 4x×2x crosses in three Solanum species were very vigorous and although few seeds/fruit were obtained when the triploids were crossed to diploids, the extensive crossing programme produced sufficient seed of four species cph, chc, pnt and tar. The average seed set for the 3x-2x crosses was an extremely low 3.5 seeds/fruit. Approximately 90% of the progeny of the 3x−2x crosses were aneuploids with chromosome numbers of 2n=25–29. The frequency of the aneuploids in the three species that were studied was chc 93%, pnt 94% and tar 92%. The aneuploids of chc and tar were extremely vigorous and fertile and they were used as females in crosses to the marker stocks. The aneuploids of pnt were vigorous, but the crossability barrier of pnt prevented their use in crosses to the marker stocks. A number of the aneuploids produced seed upon being selfed, but the ability to produce self seed may be related to the pseudo-compatibility of the parental clones. In only 7 aneuploids was there an indication that the self fertility was due to overcoming the self-incompatibility barrier as a result of competition-interaction of the aneuploid gamete. Plants in the families from the triploid-diploid crosses had a tremendous amount of variation in morphological characteristics (leaf shape, size and color; berry shape, color and degree or verrucose spotting: and plant habit and vigor). A large portion of variation exhibited in these families was due to the normal genetic segregation of the heterozygous parents. It was impossible to distinguish the aneuploids from their diploid sibs especially those having only one or two additional chromosomes because they were as vigorous and fertile as the diploids. There were some preliminary indications of the existence of distinct morphological characteristics among the aneuploids (separate petals, long berries, and extreme verrucose berries). However, there was no indication that these traits were due to the dosage effect of the extra chromosome. If it should be determined that this was true, it would be extremely useful in associating genes with chromosomes and determining the phenotypic effects due to the presence of an additional chromosome.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 29 (1980), S. 107-113 
    ISSN: 1573-5060
    Keywords: Potatoes ; ethnobotany ; primitive varieties ; ploidy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In field studies carried out at Cuyo-Cuyo, southern Peru, an area of traditional agriculture, the varietal and ploidy richness of two potato fields cultivated by the Quechua Indians was determined. Tetraploid primitive varieties were the most common, representing 95% of all plants sampled, but diploids and triploids were also found. The tuber crops agricultural system on the Incaic terraces was documented, and factors affecting the selection of potato varieties were assessed. Flavour and dry matter content were the most important quality factors indicated by local farmers.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tetraploids from seven diploid species were crossed to diploids of the same species. The triploids which were produced in four species [S. cardiophyllum (cph), S. chacoense (chc), S. pinnatisectum (pnt) and S. tarijense (tar)] were detected using the following differential features of ploidy level: number of chloroplasts per pair of guard cells; leaf index; pollen fertility; pollen size; and seed set based on crossability with diploid males. The tetraploid-diploid crosses that gave low seed set were found to produce higher frequencies of triploids and this was used as a screening procedure for the identification of families with high frequencies of triploids. Triploids were produced with different frequencies in the four species: cph 17.8%; chc 36.6%; pnt 75%; and tar 100%. The relatively high frequencies with which triploids were obtained were contrary to prior evidence of a widely distributed and effective triploid block. The results of the study indicate that the effectiveness of the triploid block is dependent not only on the species but also on the genotypic effects controlling endosperm development and the production of unreduced gametes.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 18 (1969), S. 116-123 
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A hexaploid endosperm is regularly associated with a haploid embryo following 4x–2x crosses in potato. One explanation for this is that a single 24-chromosome restitution sperm nucleus fuses with the central cell of the megagametophyte. This suggests that a superior pollinator may be one that produces a high frequency of restitution sperm nuclei. To test this, a technique was developed for observing pollen tube mitosis in vitro following germination of potato pollen in a 20% lactose-50 ppm boric acid solution. A single 24-chromosome restitution sperm nucleus was found in up to 38% of the pollen tubes from a superior pollinator. Moreover, pollen from an inferior pollinator soaked in a sucrose-boric acid-colchicine solution produced 100% restitution sperm nuclei in vitro and a haploid frequency from a tetraploid cultivar comparable to that normally induced by an untreated superior pollinator. The data indicate that the effectiveness of a pollinator in inducing haploids in potato is determined by the frequency of restitution sperm nuclei it produces.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1573-5060
    Keywords: Solanum × chaucha ; potato ; triploid ; taxonomy ; variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The variation in Solanum × chaucha Juz. et Buk. (2n=3x=36) was studied using 114 accessions from the Potato Collection maintained by the International Potato Center. These accession represented less than 5% of the collection originally screened for ploidy. Twenty morphological characters of the tubers, inflorescences and leaves were scored. The accessions were grouped into 20 morphotypes on the basis of the tuber characters. Two-qualitative characters, red-anther tip and sky-blue flowers were diagnostic of 4 morphotypes, but the variation of the quantitative characters overlapped among morphotypes, and were of limited value. Electrophoretic separation of tuber proteins in 7.5% polyacrylamide gels generally confirmed the morphotype groupings. It is concluded that each of the morphotypes represents a single genotype, and these are named according to the International Code of Nomenclature for Cultivated Plants. The variation within S. × chaucha apparently has been restricted by its hybrid origin.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The variation which persisted in interspecific aneuploids even after one or two generations of backcrossing prevented the morphological distinction of the aneuploids from their diploid sibs. An attempt was made to unmask the effects of aneuploidy by producing aneuploids within the more uniform genetic background of a single species. The procedure to produce trisomics and aneuploids of diploid species was to vegetatively double clones or seed of the species with colchicine, cross the induced tetraploids to diploids to produce triploids, and then cross the triploids to the original diploids. An attempt was made to use the same diploid clone and/or introduction of a species in all successive stages of the procedure in order to obtain as much uniformity as possible. This was largely unsuccessful because self-incompatibility and inbreeding reduced seed set. Seventy-three different tetraploids were obtained from seven species. Tuber treatments were noticeably unsuccessful in producing doubled plants. The two vegetative treatments were most successful and produced 41 different tetraploid clones while 30 doubled plants were obtained from four seed treatments. Morphologically the tetraploids resembled the diploid and there was no noticeable increase in size of leaflets and floral parts in the tetraploid. The average number of chloroplasts in ten pairs of guard cells was a distinctive feature which could efficiently be used in distinguishing the induced tetraploid plants from diploids. The tetraploids were generally less fertile than their diploid counterparts and the majority of them exhibited self-compatibility in comparison to self incompatibility of the diploids.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Potato research 15 (1972), S. 200-208 
    ISSN: 1871-4528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Der Mangel an geeigneten, gut definierten Markierungsgenen hat genetische Untersuchungen an Kartoffeln gehemmt. Eine Fülle potentiell möglicher genetischer Variation ist in den selbstunverträglichen kultivierten diploiden Formen vonSolanum tuberosum L., Gruppe Phureja und Gruppe Stenotomum, vorhanden. Diese Variation kann in den selbst-verträglichen, 24-chromosomigen Hybriden, die aus der Kreuzung dieser kultivierten Diploiden mit der Gruppe Tuberosum haploid US-W 4 stammen, ausgenützt werden. Nachkommenschaften geselbsteter 24-chromosomiger Hybrid-Klone wurden auf Aufspaltung der früher beschriebenen MarkierungsgeneP, R, Ac, B, I undF und potentiell wertvoller, neuer Markierungsgene untersucht. Die Bonitierung wurde sowohl visuell als auch durch Dünnschicht-Chromatographie der Blüten- und Knollenschalenpigmente vorgenommen. Es wurde ein neues Merkmal gefunden, das die Verteilung von Pigmenten auf der Fruchtknotenwand kontrolliert. Diese Eigenschaft scheint monogenetisch dominant vererbt zu werden, und es wurde ihr das Gen-SymbolOw gegeben. Im Pflanzenmaterial, das für diese Arbeit verwendet wurde, warOw mitI in der Kopplungsphase verbunden und mitF in der Repulsionsphase (Tabellen 1 und 2). Ein die Knollenform kontrollierendes Hauptgen scheint ebenfalls mit dieser Gruppe verbunden zu sein (Tabelle 3). Ein chemogenetischer Markierer wurde in Chromatogrammen entdeckt. Unter ultraviolettem Licht erscheint er als ein glänzendes, fluoreszierendes, blaues Band, im Aussehen sehr ähnlich der Chlorogensäure, aber mit einem niedrigeren Rf-Wert bei gleichem Laufmittel. Dieses Band scheint durch ein einzelnes dominantes Gen vererbt zu sein (Tabelle 4). Auf Grund der aus der visuellen Beurteilung und der Laboruntersuchung der Nachkommenschaften erhaltenen Information wurden die Genotypen von 31 selbstverträglichen Klonen für einige einfach vererbte Merkmale bestimmt. Zum Beispiel konnte nach der Analyse der durch Selbstung des Klons US-W 8775-34 erhaltenen Nachkommenschaft der Genotyppp. RR. FF. ii. owow. Acac bestimmt werden. Klone, wie dieser, mit bekannten Genotypen für einzelne Markierungsgene haben grossen potentiellen Wert für zukünftige genetische Untersuchungen an Kartoffeln.
    Abstract: Résumé La rareté de marqueurs génétiques appropriés, bien définis, a handicapé les études génétiques chez la pomme de terre. Il existe une abondante variation génétique, potentiellement utilisable dans les diploïdes cultivés auto-incompatibles,Solanum tuberosum L. groupe Phureja et groupe Stenotomum. Cette variation peut être exploitée dans les hybrides auto-compatibles à 24 chromosomes dérivés de croisements de ces diploïdes cultivés avec le haploïde US-W4 du groupe Tuberosum. On a retenu les descendances issues de l'autofécondation de clones hybrides à 24 chromosomes pour la ségrégation de gènes marqueurs précédemment décrits,P, R, Ac, B, I etF et de nouveaux gènes potentiellement utilisables. Le classement a été fait à la fois d'après examen visuel et d'après l'analyse chromatographique en couche mince de pigments de fleur et de la peau du tubercule. On a découvert un caractère nouveau qui règle l'apparition des pigments sur la paroi ovarienne. Ce caractère paraît être hérité comme un simple gène dominant, et on lui a attribué le symboleOw. Dans le matériel ‘plante’ utilisé dans la présente étudeOw est lié àI dans la phase d'accouplement et avecF dans la phase de séparation (Tableaux 1 et 2). Un gène majeur qui règle la forme du tubercule paraît également associé avec de groupe de liaison (linkage) (Tableau 3). On détecte un marqueur chimiogénétique dans les chromatogrammes. Sous lumière ultraviolette, il apparaît comme une bande d'un bleu brillant fluorescent très sensible en apparence à l'acide chlorogénique, mais avec une valeur inférieure Rf dans le même solvant de développement. L'hérédité de cette bande est semblable à celle d'un simple gène dominant (tableau 4). On a déterminé les génotypes de 31 clones auto-compatibles pour plusieurs caractères à hérédité simple, en se basant sur le comptage visuel et l'examen au laboratoire des descandances. Par exemple, d'après l'analyse de la descendance d'autofécondation du clone US-W 8775-43, on peut attribuer à celui-ci le génotypepp. RR. FF. ii. owow. Acac. Des clones tels que celui-ci, de génotypes connus pour plusieurs gènes marqueurs, possèdent une grande valeur potentielle pour les futures études génétiques chez la pomme de terre.
    Notes: Summary Selfing 24-chromosome hybrids derived by crossing groups Phureja and Stenotomum with the group Tuberosum haploid US-W 4 has produced progenies segregating for many traits. Monogenic segregation ratios of previously described marker genes were confirmed and the inheritance of two new trats was determined. The previously reported linkage between factors for tuber shape and tuber pigmentation was confirmed. The genotypes for several marker genes have been established on the basis of progeny tests for 31 self-compatible diploid clones. These cultivated diploid stocks with known genotypes for marker genes have great potential value for future genetic investigations in potatoes.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Potato research 17 (1974), S. 283-295 
    ISSN: 1871-4528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Die Verbindung von Genen mit spezifischen Kopplungsgruppen und die Zuteilung derselben zu spezifischen Chromosomen haben bei der Kartoffel eben erst begonnen (Kessel, 1972). Die Entwicklung von Markierstämmen für viele Gene ist eine Vorbedingung für die wirksame Anwendung von Aneuploiden in Gen-Chromosomen-Assoziationen (Tabelle 1). Es wurde die Vererbung von zwei Merkmalen auf die Nachkommenschaften studiert, die aus Kreuzungen zwischen interspezifischen Aneuploiden und bestehenden Markierstämmen herrührten. Dünnschicht-Chromatographie wurde angewendet, um einige chemogenetische Markierer und einige unterschiedliche, früher nicht beschriebene Verbindungen zu bestimmen, welche dieP-, Ac- undR-gene umfassen. ‘Pigmentierter Quirl’ ist ein Merkmal, das sich in einer Anhäufung von Anthocyanin in jungen Blätter zeigt (Abb. 1). Es wurde festgestellt, dass dieses Merkmal durch ein einzelnes, dominantes Gen (Pw) kontrolliert wird, das mit dem Gen für die pigmentierte Fruchtknotenwand (Ow, Tabellen 2 und 3) gekoppelt war und deshalb auch mit der schon nachgewiesenen KopplungsgruppeF Ow I B verbunden ist. Das andere untersuchte Merkmal betraf die ‘Pigmentierung der Blattunterseite’, die eine Anhäufung von Anthocyanin-Pigment auf der Unterseite der Fiederblättchen (Abb. 2) darstellt. Die Ergebnisse von 14 Familien zeigten, dass das Merkmal durch ein einzelnes dominantes Gen (Ul) gesteuert wird (Tabelle 4). Aus den Ergebnissen geht auch hervor, dassUl undPw positiv gekoppelt, aber mehr als 30 Crossover-Einheiten voneinander entfernt waren. Die Nachkommenschaften von 17 Familien wurden auf Crossover-Typen ausgelesen. Der Testelter, Us-W 5328-11, hatte die GeneOw undI in der Kopplungsphase und das Gen F gekoppelt in der Repulsionsphase. Die Daten der Einfach-Zweifach-und Dreifach-Crossovers von F1 und den Testkreuzungsfamilien wurden mit jedem der drei vorgeschlagenen Bereiche der Kopplungsgruppe kombiniert (Tabelle 5). Eine vorläufige genetische Karte wurde alsF Ow Pw I erstellt mit den Kartendistanzen von je 7, 3 und 8 Einheiten (Tabelle 6). Dieses Modell kann bei der zukünftigen Forschung mit verbesserten genetischen Stämmen angewendet werden.
    Abstract: Résumé L'étude de l'association de gènes avec groupes spécifiques de linkage et de l'affectation de ces groupes de linkage à des chromosomes spécifiques, vient de débuter chez la Pomme de terre (Kessel, 1972). La découverte de stocks marqueurs pour de nombreux gènes est une condition nécessaire à l'utilisation efficace d'aneuploïdes dans les associations de gènes à chromosomes (tableau 1). L'hérédité de deux caractères a été étudiée dans les descendances issues de croisements entre aneuploïdes interspécifiques et des stocks existants de gènes marqueurs. La chromatographie en couche mince a été utilisée pour identifier quelques marqueurs chimiogénétiques et quelques différentes combinaisons incluant les gènesP, Ac etR qui n'avaient pas été décrits jusqu'à présent. Le caractère ‘verticille pigmenté’ s'exprime par une accumulation d'anthocyane dans le verticille des jeunes feuilles (fig. 1). Il s'est révélé que ce caractère est dû à un seul gène dominant (Pw) lié au gène de paroi ovarienne pigmentée,Ow (tableaux 2 et 3) et, par conséquent, aussi au groupe de linkagesF Ow I B déjà identifié. L'autre caractère étudié est la ‘pigmentation de la face inférieure de la feuille’, qui consiste en une accumulation du pigment anthocyanique à la face inférieure des folioles (fig. 2). L'étude de 14 familles montre que ce caractère est dû à un seul gène dominantUl (tableau 4). Les résultats indiquent aussi queUl etPw sont positivement liés mais que plus de 30 points de cross-over les séparent. La descendance de 17 familles a été étudiée pour les types de cross-over. Le parent testeur, US-W 5328-11, possède les gènesOw etI liés dans la phase d'appariement et le gèneF lié dans la phase d'éloignement. Le nombre de cross-over simples, doubles et triples à la F1 et dans les tests de croisements des familles ont été combinés pour chacune des trois régions proposées du groupe de linkages (tableau 5). Une carte génétique préliminaire a été établie comprenantF Ow Pw I, les distances linéaires étant respectivement 7, 3 et 8 unités (tableau 6). Ce modèle peut être utilisé dans toute recherche future avec des stocks génétiques perfectionnés.
    Notes: Summary The inheritance of two traits in diploid potatoes was studied in progenies that originated from crosses between interspecific aneuploids and established marker gene stocks. ‘Pigmented whorl’ (Pw) and ‘underleaf pigmentation’ (Ul) were determined to be controlled by single dominant genes. Pigmented whorl was linked to the already establishedF Ow I B linkage group. A preliminary genetic map was established asF Ow Pw I with the map distance between the genes being 7, 3 and 8 units, respectively.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...