Hydrotime analysis of Lesquerella fendleri seed germination responses to priming treatments

Windauer, Liliana; Altuna, Agustín; Benech‐Arnold, Roberto L.

doi:10.1016/j.indcrop.2006.07.004

Cited by 57 publications

(35 citation statements)

References 7 publications

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“…As germination and seedling establishment are the critical stages in the life cycle of plants, thus vigorous seed germination and stand establishment are highly desirable for better yield of crops (Windauer et al, 2007). The optimum temperature required for germination of milk thistle seeds is between 28-29ºC (Heidari et al, 2014), however, germination mostly affected due to broad range of temperature variation in the field environment.…”

Section: Introductionmentioning

confidence: 99%

Seed Enhancement of Silybum marianum and Optimization of Silymarin Extraction

Jahan¹,

Khalil-ur-Rahman²,

Basra³

et al. 2016

IJAB

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The present study elucidates the impact of different priming strategies on seed emergence and growth of milk thistle [Silybum marianum (L.) Gaertn.] and also evaluation of the efficacy of various extraction methods for optimal extraction of silymarin from milk thistle seeds. Seeds were primed with distilled water, Humic acid (2%), potassium chloride (2%) and moringa leaf extract (3%) for 24 h. Untreated seeds were used as control. Primed and non-primed seeds were sown in plastic pots. Seed priming treatments significantly improved the performance of milk thistle seeds as indicated by higher values of final emergence and lower values of mean emergence time and time taken to 50% emergence as compared to non-primed seeds. Silymarin was extracted from seeds of milk thistle by applying various techniques like Reflux, Soxhlet, maceration and microwave assisted extraction by using various solvents. Extraction with Soxhlet and microwave assisted techniques were proved better as compared to the others. The results indicated that in both spectrophotometric and HPLC quantification, silymarin contents were found maximum in extracts prepared with methanol by microwave assisted extraction technique followed by Soxhlet.

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Section: Introductionmentioning

confidence: 99%

Seed Enhancement of Silybum marianum and Optimization of Silymarin Extraction

Jahan¹,

Khalil-ur-Rahman²,

Basra³

et al. 2016

IJAB

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“…Assuming that hydrotime constant (θ H ) is defined as follows (Bradford 1990, Windauer et al. 2007): where: θ H = hydrotime (MPa h) required to germination of percentage g, ψ = actual water potential of the germination medium, ψ b(g) = theoretical threshold or base water potential ψ at which seed germination is reduced to g, t g = theoretical time to germination of percentage g.…”

Section: Methodsmentioning

confidence: 99%

“…This model can accurately describe germination timing at reduced ψ, simultaneously accounting for reduction in both germination rates and percentages as ψ decreases. Moreover, it has been found to fit the germination data well at a range of ψ levels in many species (Gummerson 1986, Bradford 1990, Windauer et al. 2007).…”

Section: Introductionmentioning

confidence: 94%

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Hydrotime Analysis of Ethiopian Mustard (Brassica carinata A. Braun) Seed Germination Under Different Temperatures

Patanè

Tringali

2010

Journal of Agronomy and Crop Science

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Ethiopian mustard (Brassica carinata A. Braun) is an oil‐seed species that has recently become an object of great interest as a promising crop for energy purposes (biodiesel and biolubricant production). In semi‐arid regions of South Italy, soil moisture at sowing time is often inadequate, delaying and reducing seed germination. In this study, the effect of reduced water potential on seed germination in three cultivars of B. carinata (ISCI 7, CT 180 and Sincron) was investigated in the laboratory. Germination behaviour at constant temperatures under low water availability was also analysed through the hydrotime model. Six water potentials (ψs) in PEG solution (0, −0.2, −0.4, −0.6, −0.8 and −1.0 MPa) and three temperatures (10, 20 and 30 °C) were used for the germination tests. A thermo‐inhibiting effect was observed at the highest levels of water stress. The hydrotime analysis revealed that the increase of temperature to 30 °C reduced predicted hydrotime (θH) by hastening the rate of germination, but shifted median base water potential (ψb(50)) to higher values (less negative), whereas the lowering of temperature increased θH. These observations may have a great agronomic impact because although fewer seeds germinated at 30 °C at the highest levels of water stress, they may germinate faster in rapidly drying soil. However, genetic differences were observed among cultivars in terms of estimated θH and ψb(50). The hydrotime modelling approach offered in this study may help predict B. carinata seed germination under soil water deficit conditions occurring under early or late autumnal sowing.

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“…Germination and establishment of seedlings are among the critical and important stages in the life cycle of plants [5]. Seed germination is the first stage in plant growth and consists of the three steps of water absorption, lag phase and root emergence.…”

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Determination of Cardinal Temperatures of Milk Thistle (Silybum marianum L.) Germination

Heidari

Kamkar

Sinaki

2014

APAR

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responses of milk thistle to temperature, and to estimate the cardinal temperatures of its germination.Germination is the first and the most important stage in plant development and is influenced by genetic and environmental factors [3,4]. Germination and establishment of seedlings are among the critical and important stages in the life cycle of plants [5]. Seed germination is the first stage in plant growth and consists of the three steps of water absorption, lag phase and root emergence. Enzymatic activity starts in the first and second steps. During the second step, respiration increases, degradation, and synthesis reactions are started and activated, enzymes break down stored tissues and transfer materials, and finally, in the third step, radicles appear [6].Temperature and moisture can affect germination percentage and rate either singly or in combination [7]. If sufficient moisture and oxygen are provided, temperature determines the characteristics of mass germination (such as rate, uniformity and percentage of germination) of non-dormant seeds [8][9][10][11][12], and the effects of temperature on plant development are the basis for models that predict germination timing [13]. Temperature is the most important driving force influencing crop development rate [14].In 1860, it was found that plants have base or minimum, optimum and maximum or ceiling germination temperatures. The minimum or base temperature is the lowest temperature at which germination happens. The optimum temperature is the temperature with the highest germination rate and the maximum IntroductionMilk thistle (Silybum marianum L.) is one of the most important medicinal plants in the pharmaceutical industry worldwide, and is used in the production of flavonoids of the silymarin group (silybin, silidianin and silychristine). The origin of this plant has been reported to be the East Mediterranean region [1]. In this century, extensive research has been conducted on medicinal plants, and medicines that contain natural active ingredients have opened new horizons for the community of physicians and pharmacists engaged in research. Therefore, the pharmaceutical industry and research groups of many countries have turned their attention to the cultivation and production of medicinal plants [2].Given the importance of these plants in the provision of medicines required by people, the collection, and the completion of, information concerning the ecophysiological behaviors of these plants becomes a necessity. This research was conducted to evaluate non-linear regression models for describing germination Determination of Cardinal Temperatures of Milk AbstractPlants response to temperature is an important issue. In order to determine cardinal temperatures and its related germination responses to temperature, three varieties seeds of milk thistle (Shomal, Mollasani and Majarestan) were exposed to six constant temperatures (10, 15, 20, 25, 30 and 35 °C) in a four replicated factorial arranged, completely randomized design. Results indicated that the tem...

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Hydrotime analysis of Lesquerella fendleri seed germination responses to priming treatments

Cited by 57 publications

References 7 publications

Seed Enhancement of Silybum marianum and Optimization of Silymarin Extraction

Seed Enhancement of Silybum marianum and Optimization of Silymarin Extraction

Hydrotime Analysis of Ethiopian Mustard (Brassica carinata A. Braun) Seed Germination Under Different Temperatures

Determination of Cardinal Temperatures of Milk Thistle (Silybum marianum L.) Germination

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