Abstract:Linseed (Linum usitatissimum L.), cultivated from seeds, is one of the oldest plants domesticated by humans and is popularly used as a medicine. It can be used as the raw material to produce oil and bran because it has high lipids content, fiber and proteins. Based on the economic potential of this species and the need for more information about its physiology, the goal of this study was to analyze the effects of light, temperature and water stress on the germination and vigor of linseed seeds. In experiment I… Show more
“…Rossetto (1997) also verified that as the water potential reduced, there was a loss of soybean seeds performance in the first germination test count. In flax seeds, Stefanello et al (2017) observed that osmotic potentials equal to or lower than -0.30 MPa were harmful to germination, and that there was no normal seedling development up from -0.50 MPa concentration.…”
Seeds vigor can influence seed performance under stress conditions. The objectives of this study were to evaluate the effect of water and thermal stress on germination and performance of melon seedlings, and to verify if germination under stress conditions is an efficient parameter to evaluate the vigor of these seeds. Four lots of ‘Golden Mine’ melon had their initial quality characterized by germination, first count, accelerated aging and seedling emergence tests. Germination under water stress was performed on a paper moistened with PEG 6000 solution at 0.06, -0.3, -0.6 and -0.9 MPa. The percentage and speed of germination, length and dry mass of the seedlings were evaluated. For the thermal stress experiment, cold test and germination at sub- (15 ºC) and supra-optimal (35 ºC) temperatures were performed, as well as at the ideal temperature (25 ºC). The germination of melon seeds under water stress induced by PEG 6000 at -0.3 and -0.6 MPa is an efficient method to detect differences in the physiological potential of lots of melon seeds, but these differences disappear under severe water stress (-0.9 MPa). Germination under sub-optimal temperatures also allows to identify differences in seeds performance and to classify them according to the vigor level.
“…Rossetto (1997) also verified that as the water potential reduced, there was a loss of soybean seeds performance in the first germination test count. In flax seeds, Stefanello et al (2017) observed that osmotic potentials equal to or lower than -0.30 MPa were harmful to germination, and that there was no normal seedling development up from -0.50 MPa concentration.…”
Seeds vigor can influence seed performance under stress conditions. The objectives of this study were to evaluate the effect of water and thermal stress on germination and performance of melon seedlings, and to verify if germination under stress conditions is an efficient parameter to evaluate the vigor of these seeds. Four lots of ‘Golden Mine’ melon had their initial quality characterized by germination, first count, accelerated aging and seedling emergence tests. Germination under water stress was performed on a paper moistened with PEG 6000 solution at 0.06, -0.3, -0.6 and -0.9 MPa. The percentage and speed of germination, length and dry mass of the seedlings were evaluated. For the thermal stress experiment, cold test and germination at sub- (15 ºC) and supra-optimal (35 ºC) temperatures were performed, as well as at the ideal temperature (25 ºC). The germination of melon seeds under water stress induced by PEG 6000 at -0.3 and -0.6 MPa is an efficient method to detect differences in the physiological potential of lots of melon seeds, but these differences disappear under severe water stress (-0.9 MPa). Germination under sub-optimal temperatures also allows to identify differences in seeds performance and to classify them according to the vigor level.
“…The seeds were distributed on three sheets of paper moistened with distilled water at the proportion of 2.5 times the weight of the paper. After sowing, the plastic boxes were maintained in BOD (Biochemical Oxygen Demand) chambers at 15, 20, 25 and 30°C, in the presence and absence of light (Luz et al, 2014;Stefanello, Viana, & Neves, 2017). Counting was made every three days for 21 days.…”
Section: Methodsmentioning
confidence: 99%
“…For the absence of light, the seeds were sown in a room where the light was filtered with three green cellophane paper sheets. The germination boxes were maintained in the dark throughout the test by covering them with two sheets of aluminum foil (Stefanello et al, 2017). The evaluations for the condition without light were made in the room with filtered light.…”
Hesperozygis ringens (Lamiaceae), popularly known as espanta-pulga, is a threatened species endemic to rocky and sandy regions of the Pampa biome. One factor that can influence the low number of individuals of a species is a low seed germination rate influenced by temperature and/or light. Thus, the objective of this study was to evaluate the influence of light and temperature on the seed germination of H. ringens. The seeds of two lots were sown on a paper substrate and maintained in BOD chambers at temperatures of 15, 20, 25 and 30ºC in the presence and absence of light. The germination speed rate was evaluated every 3 days for 21 days. The experiment was completely randomized with treatments that had a 4 x 2 factorial design. The first visible sign (protrusion of the primary root) of germination was observed seven days after sowing. Germination occurred both in the presence and absence of light and the lowest temperatures significantly influenced the germination process and germination speed. For germinating the species, 15°C was the most favorable temperature compared to 20, 25 and 30°C. It can be concluded that a temperature of 15ºC favors the germination process of H. ringens seeds, which are insensitive to light.
“…In a study by Varga et al (2020), it was determined that L. usitatissimum seeds did not differ in germination with medium temperatures of 10 C (58%) and 20 C (59%) on the 7th day of the experiment under different salt stress conditions. Kurt and Bozkurt (2006) reported that the emergence and germination rate of L. usitatissimum seeds enhanced as the temperature increased from 10 to 30 C, and they obtained the best emergence rate (86.9%) at 30 C. Stefanello et al (2017) examined 15, 20, 25, and 30 C as germination temperature for L. usitatissimum seeds and found the best results at 20 C (79%), where 15 and 25 C (68%) showed slightly lower germination. It can be concluded that the optimum temperature required for the seed germination varies according to the species and the ecology in which the seeds of the species are collected (Fenner & Thompson, 2005;Yilmaz & Tonguç, 2013).…”
Section: Effect Of Different Treatments On Seed Germination Rate Of L...mentioning
confidence: 99%
“…There are several taxonomic studies on natural Linum species found in Turkey, as well as agronomic and phylogenetic studies on commercially used Linum species (Yılmaz et al, 2011). Studies on the germination of Linum seeds focused on L. usitassisimum , which is widely used in agriculture (Bakhit & Moradi, 2017; Stefanello et al, 2017). There are no studies on the production and ornamental plant potential of other Linum species, especially endemic ones.…”
The flax genus consists of several natural species, which have the potential as ornamental plants for ecological landscape applications. Linum pamphylicum subsp. olympicum is an endemic, naturally occurring flax species that can only be found in Bursa, Turkey. The aim of the study is to examine the morphological and biological characteristics of L. pamphylicum subsp. olympicum in relation to its cultivation and ornamental plant potential, and to reveal the best germination practices, as well as to establish an ex situ conservation garden. According to the results, in natural conditions, L. pamphylicum subsp. olympicum taxon forms a spreading habitus that is resistant to infertile and arid soil conditions. It covers the soil surface with an average width of 40.50 cm and average height of 16.63 cm foliage. It grows an average of 50.80 annual flowering branches. It is a natural taxon that draws attention with its bright yellow and long-lasting flowers. Germination of L. pamphylicum subsp. olympicum seeds suffers due to physical and physiological dormancy. By this study, the germination of L. pamphylicum subsp. olympicum seeds was improved up to 92.33% by using 4000 ppm gibberellic acid (GA 3 ) treatments. Both cold-wet stratifications with soaking in 4000 or 2000 ppm GA 3 provided the fastest germination speed of T 50 = 14 days. With the current study germination of L. pamphylicum subsp. olympicum seeds was improved significantly, the phenological and morphological characteristics were determined and a seed resource garden was established for ornamental plant studies.
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