Biometrical variation in flowers of a polyploid series of strawberries
- 22 Downloads
Summary
- 1.
Studies were made of sepal, petal and stamen numbers in a polyploid series of strawberry (Fragaria) species and varieties, and in the related speciesDuchesnea indica. Sepal and petal numbers hardly varied with ploidy group, whereas stamen numbers of octoploids and decaploids were considerably higher than in lower ploidy groups and inDuchesnea (a dodecaploid). The mean stamen numbers fall in multiples of five, with minor variations.
- 2.
In octoploid Royal Sovereign the number of floral parts decreases from primary to later flowers, but the ratio of numbers of different parts remains more or less constant.
- 3.
The sex of a flower seems to have little effect on number of stamens, the gene for femaleness principally reducing anther development.
- 4.
Progenies from crossing octoploids indicate a genetic basis for floral part number.
- 5.
Comparisons are made with stamen studies in other plants. Several evolutionary problems are discussed: it is suggested that the strain ofFragaria chiloensis at present cultivated in Ecuador is not identical with the ancestral strain of the cultivated strawberry.
Keywords
Anther Development Floral Part Floral Character Carpel Number Flower PositionPreview
Unable to display preview. Download preview PDF.
References
- Bunyard, E. A. (1913). The history and development of the strawberry.J. R. hort, Soc. 39, 541–52.Google Scholar
- Grane, M. B. &Lawrence, W. J. C. (1952).The Genetics of Garden Plants, 4th ed. London: Macmillan.Google Scholar
- Darrow, G. M. (1937). Strawberry improvement.Yearb. U.S. Dep. Agric. pp. 445–95.Google Scholar
- Fisher, R. A. (1946).Statistical Methods for Research Workers, 10th ed. Edinburgh: Oliver and Boyd.Google Scholar
- Floor, J. &Rogers, W. S. (1945). Key for the identification of the commonly cultivated commercial varieties of strawberries.J. Hort. Sci. 21, 34–40.Google Scholar
- Guttridge, C. G. (1951). Inflorescence initiation and aspects of the growth of the strawberry.Long Ashton Ann. Rep. pp. 42–8.Google Scholar
- Haskell, G. (1954a). Stamen number and variation in diploid and tetraploid cherries.Ann. Bot., Lond., N.S.,18, 95–111.Google Scholar
- Haskell, G. (1954b). The stamen constancy of diploid and polyploid pears.New Phytol. 53, 349–53.CrossRefGoogle Scholar
- Kostoff, D. (1939). Polyploids are more variable than then original diploids.Nature, Lond.,144, 868–9.CrossRefGoogle Scholar
- Mather, K. (1950). The genetical architecture of heterostyly inPrimula, sinensis.Evolution,4, 340–52.CrossRefGoogle Scholar
- Miller, P. (1807).The Gardener’s Dictionary. London.Google Scholar
- Noggle, G. R. (1946). The physiology of polyploidy in plants. I. Review of the literature.Lloydia,9, 153–73.Google Scholar
- Popenoe, W. (1921). The Erutffla or Chilean strawberry.J. Hered. 12, 457–66.Google Scholar
- Scott, D. H. (1951). Cytological studies on polyploids derived from tetraploidFragaria vesca and cultivated strawberries.Genetics,36, 311–31.PubMedGoogle Scholar
- Smith, H. H. (1943). Studies in induced heteroploids ofNicotiana.Amer. J. Bot. 30, 121–30.CrossRefGoogle Scholar
- Valleau, W. D. (1918). Sterility in the strawberry.J. Agric. Res.,12, 613–69.Google Scholar