The Anatomy of the Stigma and Style from Cyclamen persicum (Mill.) cv. “Pure White” and its Relation to Pollination Success

S. Reinhardt; A. Ewald; F. Hellwig

doi:10.1055/s-2006-924649

Plant Biology, Table of Contents

Plant Biol (Stuttg) 2007; 9(1): 158-162
DOI: 10.1055/s-2006-924649

Short Research Paper

Georg Thieme Verlag Stuttgart KG · New York

The Anatomy of the Stigma and Style from Cyclamen persicum (Mill.) cv. “Pure White” and its Relation to Pollination Success

S. Reinhardt¹ , A. Ewald¹ , F. Hellwig²

¹Institute of Vegetable and Ornamental Crops, Department for Plant Propagation, Kühnhäuser Straße 101, 99189 Kühnhausen, Germany
²Institute of Systematic Botany, Friedrich Schiller University Jena, Philosophenweg 16, 07743 Jena, Germany

Abstract

Old flowers of Cyclamen generate few or no seeds. To understand the pollination problems of Cyclamen we investigate the general anatomy of the stigma and the style of Cyclamen persicum by scanning electron microscopy at different stages of floral maturity. Our investigations confirm that there is a hollow style. Against data commonly found in the literature, we present evidence of pollen germination and tube growth that show the stigma is not outside the style but inside it. Furthermore the maturation process of the style during the flowering time indicates a mechanism by which the stigma becomes shut off through closure at the terminal aperture of the style. At 3 to 5 days after anthesis there was the beginning closure of the style which was nearly completed at 21 days. The substance which leads to the closure is still unknown. The closure of the hollow style is a probable cause for failure of seed set in flowers not pollinated early in anthesis.

Key words

Cyclamen persicum - hollow style - SEM - pollination - style anatomy.

Full Text

References

1 Anonymous .Federal Statistical Office Germany, Series 3, R. 3.1.6. 2000. (2000)
2 Bongartz W.. Cyclamen. Braunschweig; Thaacker Medien (1999): 9
3 Clennett J. C. B.. An analysis and revision of Cyclamen L. with emphasis on subgenus Gyrophoebe O. Schwarz. Botanical Journal of the Linnean Society. (2002); 138 473-481
4 Compton J. A., Clennett J. C. B., Culham A.. A Nomenclature in the dock. Overclassification leads to instability: a case study in the horticulturally important genus Cyclamen (Myrsinaceae). Botanical Journal of the Linnean Society. (2004); 146 339-349
5 Cresti M., Blackmore S., van Went J. L.. Atlas of Sexual Reproduction in Flowering Plants. Oxford; Springer Verlag (1991) 95ff. 99 161
6 Ewald A., Schwenkel H. G.. Einfluß von Blütenalter und Genotyp auf den Samenansatz von Cyclamen persicum “Sylvia”. Gartenbauwissenschaft. (1999); 64 49-53
7 Gielly L., Debussche M., Thompson J. D.. Geographic isolation and evolution of Mediterranean endemic Cyclamen: insights from chloroplast trnL (UAA) intron sequence variation. Plant Systematics and Evolution. (2001); 230 75-88
8 Greilhuber J.. Karyotype structure and evolution in Cyclamen L. subge. Psilantum Schw. (Primulaceae). Flora. (1989); 183 103-113
9 Gruendler I. G.. Das Alpenveilchen. Weixdorf; Deutscher Landwirtschaftsverlag Berlin (1986): 19
10 Heslop-Harrison Y., Shivana K. R.. The receptive surface of the angiosperm stigma. Annals of Botany. (1977); 41 1233-1258
11 Kugler H.. Einführung in die Blütenökologie. Jena, München; Gustav Fischer Verlag (1955): 24
12 Pechan P. M.. Ovule fertilization and seed number per pod determination in oil seed rape (Brassica napus). Annals of Botany. (1988); 61 201-207
13 Schlagorsky M.. Das Bauprinzip des Primulaceaengynoeciums bei der Gattung Cyclamen. Österreichische Botanische Zeitschrift. (1949); 96 361-369
14 Wellensiek S. J.. The Breeding of Cyclamens. Publication No. 105, Laboratorium voor Tuinbouwplantenteelt, Landbouwhogeschool, Wageningen, The Netherlands. (1952)

S. Reinhardt

Institute of Vegetable and Ornamental Crops
Department for Plant Propagation

Kühnhäuser Straße 101

99189 Kühnhausen

Germany

Email: reinhardt@erfurt.igzev.de

Editor: F. R. Scarano