Dormancy, germination, and sensitivity to salinity stress in five species of Potentilla (Rosaceae)

Author:

Kołodziejek Jeremi1,Patykowski Jacek2,Wala Mateusz12

Affiliation:

1. Department of Geobotany and Plant Ecology, Faculty of Biology and Environmental Protection, University of Lodz, 90-237 Łódź, Poland.

2. Department of Plant Physiology and Biochemistry, Faculty of Biology and Environmental Protection, University of Lodz, 90-237 Łódź, Poland.

Abstract

Laboratory and greenhouse experiments were conducted to determine the effect of environmental factors on the germination and emergence of five species of Potentilla L. All of the species we studied differed in their germination requirements, and these could be related to their habitat/ecology. For all species, completion of germination was the highest at 25/15 °C with a 14 h photoperiod. Seeds of Potentilla argentea L. and P. inclinata Vill. completed germination immediately after ripening while seeds of P. aurea Borkh., P. incana P.Gaertn., B.Mey. & Scherb., and P. reptans L. needed a 16-week period of cold stratification to break dormancy. GA3 treatment did not substitute for cold stratification. The seeds of all species did not complete germination in darkness and showed maximal emergence on the soil surface, which suggests the formation of a persistent seed bank. Completion of germination was inhibited by decreasing osmotic potential and increasing salt concentration. The seeds of all species we studied can complete germination in both acidic and alkaline soils. These results suggest that under field conditions, if moisture and (or) salinity are not limiting factors and a seed is located on the soil surface, completion of germination of nondormant species (P. argentea and P. inclinata) is possible any month of the growing season.

Publisher

Canadian Science Publishing

Subject

Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics

Reference55 articles.

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3. Baskin, J.M., and Baskin, C.C. 1989. Physiology of dormancy and germination in relation to seed bank ecology. In Ecology of soil seed banks. Edited by M. Leck, V. Parker, and R. Simpson. Academic Press, San Diego, Calif. pp. 53–65.

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