Using hydrothermal time concept to describe sesame (Sesamum indicum L.) seed germination response to temperature and water potential

2017 ◽  
Vol 39 (11) ◽  
Author(s):  
Esmaeil Bakhshandeh ◽  
Mohsen Jamali ◽  
Esmaeil Afshoon ◽  
Mobina Gholamhossieni
Keyword(s):  
Seed Germination ◽  
Water Potential ◽  
Sesamum Indicum ◽  
Hydrothermal Time ◽  
Germination Response ◽  
Response To Temperature

Quantification of Retama raetam seed germination response to temperature and water potential using hydrothermal time concept

2019 ◽  
Vol 157 ◽  
pp. 211-216 ◽  
Author(s):  
Raoudha Abdellaoui ◽  
Fayçal Boughalleb ◽  
Dhikra Zayoud ◽  
Mohamed Neffati ◽  
Esmaeil Bakhshandeh
Keyword(s):  
Seed Germination ◽  
Water Potential ◽  
Hydrothermal Time ◽  
Germination Response ◽  
Retama Raetam ◽  
Response To Temperature

Variation of seed germination response to temperature in tomato landraces: An adaptation strategy to environmental conditions

2021 ◽  
Vol 281 ◽  
pp. 109987
Author(s):  
Naeimeh Sousaraei ◽  
Benjamin Torabi ◽  
Kambiz Mashaiekhi ◽  
Elias Soltani ◽  
Seyyed Javad Mousavizadeh
Keyword(s):  
Seed Germination ◽  
Environmental Conditions ◽  
Adaptation Strategy ◽  
Germination Response ◽  
Response To Temperature

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.

Hydrothermal time analysis of tomato seed germination at suboptimal temperature and reduced water potential

1994 ◽  
Vol 4 (2) ◽  
pp. 71-80 ◽  
Author(s):  
Peetambar Dahal ◽  
Kent J. Bradford
Keyword(s):  
Seed Germination ◽  
Water Potential ◽  
Time Course ◽  
Hydrothermal Time ◽  
Tomato Seed ◽  
Time Model ◽  
Germination Time ◽  
Radicle Emergence ◽  
Time Courses ◽  
Hydrotime Model

AbstractBoth temperature (T) and water potential (ψ) have consistent and quantifiable effects on the rate and extent of seed germination (radicle emergence). Germination at suboptimal T can be characterized on the basis of thermal time, or the T in excess of a base (Tb) multiplied by the time to a given percentage germination (tg). Similarly, germination at reduced ψ can be characterized on a hydrotime basis, or the ψ in excess of a base (ψb) multiplied by tg. Within a seed population, the variation in thermal times to germination for a specific percentage (g) is based upon the normal distribution of ψb values among seeds (ψb(g)). Germination responses across a range of suboptimal T and ψ might be accounted for by a general hydrothermal time model incorporating both T and ψ components. We tested this hypothesis for tomato (Lycopersicon esculentum Mill.) seeds of two genotypes differing in germination rates and tolerance of suboptimal T and ψ. For combinations of T (10−25°C) and ψ (0 to −0.9 MPa), a general hydrothermal time model accounted for approximately 75% of the variation in times to germination within the seed populations of both genotypes, and over 96% of the variation in median germination rates. However, ψb(g) distributions were sensitive to both the T and ψ of imbibition, resulting in a poor fit of the model to specific time course data. Analysis of germination timing separately for low and high ψ ranges within a given T resulted in specific models accounting for 88−99% of the variation in individual germination times and >99% of the variation in madian germination rates. Thus, for a given T and ψ range, the hydrotime model closely matched tomato seed germination time courses. Accumulated hydrothermal time accounted well for germination rates at ψ> −0.5 MPa across suboptimal T if ψb(g) was allowed to vary with T. Germination did not show a consistent response to T at ψ < −0.5 MPa, and estimated Tb values varied over different T ranges. Generalization of the hydrothermal time model across the entire range of suboptimal T and ψ was limited by physiological adjustments of the seeds to their current environment. The hydrothermal time model detected and quantified these adjustment processes that would otherwise not be evident from inspection of germination time courses. Temperature and water potential influence the time to germination via physiological mechanisms that reciprocally interact.

scholarly journals Determination of Germination Response to Temperature and Water Potential for a Wide Range of Cover Crop Species and Related Functional Groups

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0161185 ◽  
Author(s):  
Hélène Tribouillois ◽  
Carolyne Dürr ◽  
Didier Demilly ◽  
Marie-Hélène Wagner ◽  
Eric Justes
Keyword(s):  
Water Potential ◽  
Functional Groups ◽  
Cover Crop ◽  
Crop Species ◽  
Germination Response ◽  
Wide Range ◽  
Response To Temperature

Seed germination response to temperature for a range of international populations ofConyza canadensis

Weed Research ◽  
2013 ◽  
Vol 54 (2) ◽  
pp. 178-185 ◽  
Author(s):  
E Tozzi ◽  
H Beckie ◽  
R Weiss ◽  
J L Gonzalez-Andujar ◽  
J Storkey ◽  
...  
Keyword(s):  
Seed Germination ◽  
Germination Response ◽  
Response To Temperature
Sign in / Sign up

Export Citation Format

Share Document