Die Erscheinung der Heteroploidie, besonders im Pflanzenreich

Wettstein, Fritz von

doi:10.1007/978-3-642-49712-4_5

Cited by 45 publications

(7 citation statements)

References 51 publications

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“…The lag would be the time it takes for an asexual, new polyploid lineage to generate successful sexual diploids. The observation-based conclusion that wild, extant polyploids might survive because they can reproduce asexually is probably a century old (Wettstein, 1927), but the idea has had little impact in the "why plant polyploidy?" arena.…”

Section: Polyploidy As a Spandrelmentioning

confidence: 99%

Picking up the Ball at the K/Pg Boundary: The Distribution of Ancient Polyploidies in the Plant Phylogenetic Tree as a Spandrel of Asexuality with Occasional Sex

Freeling

2017

The Plant Cell

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Section: Polyploidy As a Spandrelmentioning

confidence: 99%

Picking up the Ball at the K/Pg Boundary: The Distribution of Ancient Polyploidies in the Plant Phylogenetic Tree as a Spandrel of Asexuality with Occasional Sex

Freeling

2017

The Plant Cell

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“…Polyploids often escape this disadvantage if they are self-compatible (Robertson et al, 2011), but it has long been hypothesized that another viable mechanism to escape the reduced sexual reproduction (i.e. via seeds formed through sexual means) is vegetative reproduction whereby genetically identical ramets are produced through clonal growth (von Wettstein, 1927;Gustafsson, 1948;Stebbins, 1957; see also Husband et al, 2013). Clonal reproduction enables newly formed polyploids to persist by forming sufficiently large populations in the absence of sexual reproduction.…”

Section: Introductionmentioning

confidence: 99%

Polyploid species rely on vegetative reproduction more than diploids: a re-examination of the old hypothesis

2017

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“…The two species responded well to the treatment of colchicine and showed somewhat similar morphological changes fol lowing colchicine treatment, though the frequency of induction of polyploidy was found to be much higher in A. hypochondriacus than in A. dubius. The higher level of polyploidy in A. dubius might be limiting for the process as Wettstein (1927) and Levan (1942) have observed that the chromosome number of a species can under no conditions be doubled indefinitely without deleterious results. Stebbins (1950) was also of the opinion that "although some autotetraploids are equal to or superior to their diploid progenitors in vigour or other desirable qualities, autooctoploids are nearly always so abnormal as to be sublethal".…”

Section: Discussionmentioning

confidence: 99%

Induced Polyploidy in <i>Amaranthus hypochondriacus</i> L. and <i>Amaranthus dubius</i> Mart. ex Thell

Behera

Patnaik

1975

CYTOLOGIA

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Induction of polyploidy by experimental methods has been proved to be a handy tool in tampering with the genotype of the organisms and in widening the amplitude of variation in the gene pool. Though various methods of induction of polyploidy have been developed, induction through the application of colchicine has been met with remarkable success especially with many herbaceous plants.As a part of the programme of induction of polyploidy in various species of Amaranthaceae two species viz. Amaranthus hypochondriacus L. and Amaranthus dubius Mart. ex Thell. were induced for polyploidy. As the vegetative parts such as the leaf and stem of various species of Amaranthus L. are edible and autopolyploidy very often magnifies the vegetative characters, this programme of work has been undertaken to evaluate whether such an effort will be of economic value and whether some improved varieties of this crop can be raised.Attempts to induce polyploidy in some species of Amaranthus L. had been made in the past. Murray (1940) induced tetraploidy in some monoecious and dioecious species of Amaranthus L. Tandon and Chinoy (1950) also made effort to induce te traploidy in A. blitum L. Recently Pal and Khoshoo (1968) induced tetraploidy in A. edulis Speg. and have made detail analysis of the tetraploids through C0 and C1 generations.About 10 species of Amaranthus L. grow throughout India, almost all of which are edible. The reports of the induction of polyploidy in this genus seem to be fragmentary. With a view to have wide scale induction of polyploidy in this genus the present work is undertaken. Materials and methodsThe seeds of Amaranthus hypochondriacus were obtained from the state Agricul ture Department and those of A. dubius were procured from the local gardens.Two different types of colchicine treatments were adopted i.e. i) seed treat ment and ii) seedling treatment. The different concentrations of colchicine used in both the treatments were 0.1, 0.2, 0.3, 0.4 percent of aqueous solution.i) Seed treatment: The seeds were soaked in aqueous solutions of colchicine of different concentrations in petridishes for six hours. A set was maintained as control by soaking the seeds in distilled water. After soaking, the seeds were thoroughly washed in tap water and were sown in flat earthenware pots as well as in the field. The results of such treatment were not promising because very few seeds germinated.

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Die Erscheinung der Heteroploidie, besonders im Pflanzenreich

Cited by 45 publications

References 51 publications

Picking up the Ball at the K/Pg Boundary: The Distribution of Ancient Polyploidies in the Plant Phylogenetic Tree as a Spandrel of Asexuality with Occasional Sex

Picking up the Ball at the K/Pg Boundary: The Distribution of Ancient Polyploidies in the Plant Phylogenetic Tree as a Spandrel of Asexuality with Occasional Sex

Polyploid species rely on vegetative reproduction more than diploids: a re-examination of the old hypothesis

Induced Polyploidy in <i>Amaranthus hypochondriacus</i> L. and <i>Amaranthus dubius</i> Mart. ex Thell

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