scholarly journals Comparison of the effects of temperature and water potential on seed germination of Fabaceae species from desert and subalpine grassland

2015 ◽  
Vol 102 (5) ◽  
pp. 649-660 ◽  
Author(s):  
Xiao Wen Hu ◽  
Yan Fan ◽  
Carol C. Baskin ◽  
Jerry M. Baskin ◽  
Yan Rong Wang
Keyword(s):  
Seed Germination ◽  
Water Potential ◽  
Effects Of Temperature

scholarly journals Effects of temperature and water potential on seed germination of 13 Poa L. species in the Qinghai-Tibetan Plateau

2020 ◽  
pp. e01442
Author(s):  
Linna Wei ◽  
Chunping Zhang ◽  
Quanmin Dong ◽  
Zengzeng Yang ◽  
Hui Chu ◽  
...  
Keyword(s):  
Seed Germination ◽  
Tibetan Plateau ◽  
Water Potential ◽  
Effects Of Temperature

Seed germination of pitaya (Hylocereus spp.) as affected by seed extraction method, storage, germination conditions, germination assessment approach and water potential

2019 ◽  
Vol 33 (3) ◽  
pp. 372-394
Author(s):  
Dessireé Zerpa-Catanho ◽  
Andrés Hernández-Pridybailo ◽  
Viviana Madrigal-Ortiz ◽  
Adonay Zúñiga-Centeno ◽  
Carolina Porras-Martínez ◽  
...  
Keyword(s):  
Seed Germination ◽  
Water Potential ◽  
Extraction Method ◽  
Assessment Approach ◽  
Seed Extraction

Modeling germination and seedling elongation of common lambsquarters (Chenopodium album)

Weed Science ◽  
1999 ◽  
Vol 47 (2) ◽  
pp. 149-155 ◽  
Author(s):  
Erivelton S. Roman ◽  
A. Gordon Thomas ◽  
Stephen D. Murphy ◽  
Clarence J. Swanton
Keyword(s):  
Seed Germination ◽  
Water Potential ◽  
Mechanistic Model ◽  
Chenopodium Album ◽  
Seedling Emergence ◽  
Probit Analysis ◽  
Hydrothermal Time ◽  
Time Model ◽  
Common Lambsquarters ◽  
Radicle Elongation

The ability to predict time of weed seedling emergence relative to the crop is an important component of a mechanistic model describing weed and crop competition. In this paper, we hypothesized that the process of germination could be described by the interaction of temperature and water potential and that the rate of seedling shoot and radicle elongation vary as a function of temperature. To test these hypotheses, incubator studies were conducted using seeds and seedlings of common lambsquarters. Probit analysis was used to account for variation in cardinal temperatures and base water potentials and to develop parameters for a new mathematical model that describes seed germination and shoot and radicle elongation in terms of hydrothermal time and temperature, respectively. This hydrothermal time model describes the phenology of seed germination using a single curve, generated from the relationship of temperature and water potential.

scholarly journals Adaptive drought tolerance during germination of Salsola drummondii seeds from saline and nonsaline habitats of the arid Arabian deserts

Botany ◽  
2019 ◽  
Vol 97 (2) ◽  
pp. 123-133 ◽  
Author(s):  
Attiat Elnaggar ◽  
Ali El-Keblawy ◽  
Kareem A. Mosa ◽  
Teresa Navarro
Keyword(s):  
Polyethylene Glycol ◽  
Seed Germination ◽  
Drought Tolerance ◽  
Light Regimes ◽  
Saline Habitats ◽  
Population Origin ◽  
Effects Of Temperature ◽  
Osmotic Potentials

The effects of temperature, light, salinity, and drought on germination of halophytes have been extensively studied. However, few studies have focused on the germination of plants that grow well in both saline and nonsaline habitats (i.e., habitat-indifferent halophytes). Here, we assess the impacts of population origin, temperature, and light on drought tolerance, as simulated with polyethylene glycol (PEG), during germination of Salsola drummondii Ulbr., a habitat-indifferent halophyte from the arid Arabian deserts. Seeds were collected from both saline and nonsaline habitats and germinated at six concentrations of PEG at three temperatures and two light regimes. An increase in the concentration of PEG resulted in a significant reduction in seed germination, especially at higher temperatures. Seeds from the nonsaline habitat attained significantly greater germination efficiency at concentrations of PEG up to –1.2 MPa, but there was no difference in germination of seeds between the two habitats at concentrations of –1.5 MPa. Seeds from the saline habitat germinated significantly faster at higher concentrations of PEG. Germination was significantly higher in darkness than in light at –1.5 MPa at the lower temperatures, but the opposite was true for the higher temperatures. Seeds from saline habitats had higher levels of dormancy and faster rates of germination at higher concentrations of PEG because of their adaptation to low osmotic potentials.

Water potential of cherry tomato (Lycopersicon esculentum Mill.) placenta and seed germination in response to desiccation during fruit development

2004 ◽  
Vol 14 (2) ◽  
pp. 249-257
Author(s):  
Albert T. Modi ◽  
Belinda J. White
Keyword(s):  
Seed Germination ◽  
Lycopersicon Esculentum ◽  
Water Potential ◽  
Amylase Activity ◽  
Cherry Tomato ◽  
Stages Of Development ◽  
Stage Of Development ◽  
Activity Promotion ◽  
Germination Behaviour ◽  
Seed Water Content

Cherry tomato (Lycopersicon esculentum Mill.) seeds harvested from fruits at four stages of development [2, 4, 6 and 8 weeks after flowering (WAF)] were washed (1% HCl) and germinated after 72 h of desiccation at 20°C, and 76%, 49% or 12% RH. Seed α-amylase activity was determined at each stage of development and correlated with seed germination. Desiccation at 76% and 49% RH had no significant effect on the germination of seeds at 4, 6 and 8 WAF, whereas it improved germination of seeds at 2 WAF. Low RH (12%) significantly reduced seed germination at all stages of development. There was a positive correlation (r = 0.68, P ≤ 0.05) between germination and α-amylase activity during seed development. Scanning electron microscopy also revealed a correlation between starch grain occurrence in the endosperm and α-amylase activity. Placenta water potential decreased with fruit and seed maturation, and correlated negatively with improved seed germination and α-amylase activity. Promotion of seed germination by desiccation in developing cherry tomato seeds was lost 4 weeks prior to mass maturity (80 ± 3% seed water content and –2.3 ± 0.1 MPa placenta water potential). It is proposed that the water potential differential between the placenta and the seeds influences α-amylase activity and germination behaviour during development.

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