Abstract
The current study aimed to investigate the effects of the temperature, light, and water stress on Piptadenia stipulacea seed germination. It assessed germination percentage, speed and average germination time, root and stem length as well as the dry weight of seedlings subjected to the constant temperatures of 20°C, 25°C and 30°C and alternating temperatures from 20°C to 30°C. A 12-hour photoperiod was established in addition to the following light conditions: white, darkness, red and far red. The experimental design was completely randomized and four replicates of 25 seeds were performed for each treatment. Regarding water stress, seeds were subjected to osmotic potentials of 0, -0.2, -0.4, -0.6, -0.8, -1.0, and -1.2 MPa, at 30°C and 12 h light/12 h darkness photoperiods. After they were mixed, 100 seeds were randomly selected for biometric measurement and they were found to be uneven with respect to size and weight. P. stipulacea seeds germinated under all tested temperature and light conditions. Germination under water stress occurred up to -0.8 MPa. The conclusion is that there was no germination from -1.0 MPa. The seeds are light-indifferent and germinate at the constant temperatures of 20°C, 25°C and 30°C and alternating temperatures from 20°C to 30°C.
Highlights
Piptadenia stipulacea (Benth.) Ducke, Fabaceae, is found in “Não me deixes” Farm, a Natural Heritage Private Reserve located in Quixadá County, Ceará State, Brazil, within an area covered by Caatinga vegetation
The current study aimed to investigate the effects of temperature, light and water stress on P. stipulacea seed germination
The thousand seed weight was of 44.134 g, which allows inferring that a kilogram of P. stipulacea seeds can contain 22,658 seeds
Summary
Piptadenia stipulacea (Benth.) Ducke, Fabaceae, is found in “Não me deixes” Farm, a Natural Heritage Private Reserve located in Quixadá County, Ceará State, Brazil, within an area covered by Caatinga vegetation. Its seeds show integumentary dormancy [1], which is a very common phenomenon in seeds from Caatinga area tree species, in the Brazilian Northeast semi-arid region [2]. The morphologically developed seed requires environmental stimuli such as temperature, light (both quantity and quality) and, above all, water availability for the germination and establishment of new seedlings in a safe environment. In addition to such stimuli, seeds size and vigor are features that must be taken into consideration when one studies native species. The current study aimed to investigate the effects of temperature, light and water stress on P. stipulacea seed germination
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