Role of Temperature, Light and Growth Regulators in Germination in Anemone coronaria L

Abstract

The optimal temperature range for germination of achenes of the De Caen type of cultivated A. coronaria L. was 10-20°C. Continuous irradiation with white light retarded germination, particularly at supraoptimal temperature. The retardation was caused by the far-red component of the light. Blue light was inactive by itself but synergized with far-red. Gibberellic acid (GA,) promoted gerrnination only at supraoptimal temperature (2S°C). Abscisic acid (ABA) inhibited germination more at 20 than at 15°C. Rinsing the achenes with water completely removed the inhibition caused by 40 p.p.m. ABA. GA3 at a concentration of 100 p.p.m. partly overcame the inhibition caused by ABA.The growth retardants (2-chloroethyl)trimethylammonium chloride and Amo-1618 12'-isopropyl-4'-(trimethylammonium chloride)-5'-methylphenyl piperidine-1-carboxylate] inhibited germination more at

Geophytes–herbivore interactions: reproduction and population dynamics of Anemone coronaria L.

“…We propose that by removing the previous year's mulch and by further reducing current green herbaceous biomass grazing reduces shading and increases relative PAR at ground level. Optimal germination of A. coronaria occurs at 10-15°C in darkness and it is inhibited by far-red light (Horovitz et al 1975a, b;Bullowa et al 1975). Therefore, the additional light at ground level probably did not increase seed germination but rather the development and establishment of seedlings, resulting in higher seedling and adult plant densities (Fig.…”

The role of temperature in post-dispersal embryo growth and dormancy break in seeds of Aconitum lycoctonum L.

“…The lag period resulting from the obligatory growth of the embryo has been termed as morphological dormancy (Nikolaeva, 1977). Studies have indicated that in some Ranunculaceae species there is no additional mechanism preventing embryo growth and seed germination (Baskin and Baskin, 1986;Bullowa and Ozeri, 1975). In seeds of many Ranunculaceae, however, an additional physiological mechanism delays embryo growth even in optimal conditions.…”

Germination characters in wild and cultivated Anemone coronaria L.

“…This segment contains the types with the shortest lag period between achene imbilition and protrusion of the embryo. The thoroughness of selection for such types is perhaps borne out by the work of BULLOWA et al (1975) who did not succeed to further shorten the post-imbibition lag period by treatments with gibberellic acid.…”

“…To facilitate embryo excision the achenes were softened in boiling water. This treatment precludes any embryo growth which may attend incubation in water (BULLOWA et al, 1975). Excised embryos were mounted in glycerin for study.…”

“…In Anemone the dispersal unit is an achene whose coat generally bears a water repellent hair cover (BULLOWA et al, 1975). Glabrous-fruited forms exist (HORO-VITZ et al, 1975) whose achenes can imbibe more rapidly.…”