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- Title
Untersuchungen zur Keimungsbiologie von sechs tropischen Segetalarten.
- Authors
Sauerborn, J.; Koch, W.
- Abstract
With the six tropical arable weeds studied, <em>Ageratum conyzoides, Blechum brownei, Crassocephalum crepidioides, Mikania micrantha, Paspalum conjugatum</em> and <em>P. paniculatum</em>, the lowest temperatures at which germination occurred were in the range 10-15(20)°C, the highest up to 40°C, with the optimum between 20°C and 35°C. <em>Ageratum conyzoides</em> and <em>C. crepidioides</em> had lower limits of germination temperature than the other species, which explains their comparatively greater incidence at high altitudes. The germination temperatures of both representative temperate species, <em>Alopecurus myosuroides</em> and <em>Chenopodium album</em> were 5 (minimum), 15-25 (optimum) and 40°C (maximum). The germination of <em>A. conyzoides</em>, <em>C. crepidioides</em> and <em>M. micrantha</em> was reduced by an osmotic potential of -1 bar. At -4.7 bar only <em>P. paniculatum</em> of the tropical species germinated to a small extent whilst <em>Al. myosuroides</em> and <em>Ch. album</em> were not affected. After storage for a year in dry conditions all six tropical species only germinated when exposed to light. After 20 months, <em>C. crepidioides</em> and <em>P. paniculatum</em> would also do so in the dark.
- Subjects
GERMINATION; PLANT embryology; PLANT physiology; SEED viability; WEEDS
- Publication
Weed Research, 1988, Vol 28, Issue 1, p47
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1988.tb00784.x