Modeling the upshots of induced temperature and water stress on germination and seedlings length of radish (Raphanus sativus L.) via hydrothermal time model

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Research Article | Published:

Print ISSN : 0970-4078.
Online ISSN : 2229-4473.
Pub Email:
Doi: 10.1007/s42535-022-00490-4
First Page: 939
Last Page: 949
Views: 178

Keywords: Germination modeling, Germination attributes, Hydro time, Thermal time, Drought stress, Radish


Radish (Raphanus sativus L.), a representative of the Brassicaceae family, is an extensively cultivated root vegetable across the world. Thermal time (TT), hydro time (HT), and hydrothermal time (HTT) models can be used to characterize the response of seed germination rate to temperature (T) and water potential (ψ). The germination behavior of radish was investigated throughout a range of constant temperatures and water potentials to evaluate the effectiveness of hydro-thermal time model and offer a data set of germination thresholds and parameters. The study was intended to simultaneously inspect the radish seed germination (SG) pattern, base water potentials (ψb(50)) and cardinal temperatures across varying temperatures (Ts) and PEG-6000 water potentials (Ψs) via the hydrothermal time (HTT) model. In a laboratory experiment Raphanus sativus L. seeds were germinated at four constant Ts of 15, 20, 30 and 40 °C under four different water potentials (ψs) of 0, − 0.2, − 0.4 and − 0.6 MPa. Germination decreased significantly at (p ≤ 0.01) from 40% at 15 °C in − 0.2 MPa to 13% in − 0.8 MPa at 40 °C. The results also revealed that radish was more sensitive to ψ than T (p ≤ 0.01). As per the significance level of the model attributes (R2: 0.527), the average cardinal temperatures were 15, 20 and 40 °C for the base (Tb), optimal (To) and ceiling (Tc) temperatures respectively. Germination energy (GE), germination rate index (GRI), germination percentage (G%), germination index (GI), mean moisture content (MMC), seed vigor index 1 and 2 (SVI-1 and SVI-2), were recorded maximum in control condition at 15 and 20 °C and minimum at − 0.8 MPa at 40 °C. The model applied here, and its attributes, may be used as a prediction tool in different SG simulation studies, each with its own set of strengths and drawbacks. The hydrothermal constant investigates the interaction influence of T and ψ on germination under diverse ecological settings using germination data, cardinal temperatures, and statistical analysis.

Germination modeling, Germination attributes, Hydro time, Thermal time, Drought stress, Radish

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Abdellaoui R, Boughalleb F, Zayoud D, Neffati M, Bakhshandeh E (2019) Quantification of Retama raetam seed germination response to temperature and water potential using hydrothermal time concept. Environ Exp Bot 157:211–216

Abid M, Hakeem A, Shao Y, Liu Y, Zahoor R, Fan Y, Dai T (2018) Seed osmo- priming invokes stress memory against post-germinative drought stress in wheat (Triticum aestivum L.). Environ Exp Bot 145:12–20

Alvarado V, Bradford KJ (2002) A hydrothermal time model explains the cardinal temperatures for seed germination. Plant Cell Environ 25:1061–1069

Atashi S, Bakhshandeh E, Mehdipour M, Jamali M, Da-Silva JAT (2015) Application of a hydrothermal time seed germination model using the Weibull distribution to describe base water potential in zucchini (Cucurbita pepo L.). J Plant Growth Regul 34:150–157

Atashi S, Bakhshandeh E, Zeinali Z, Yassari E, Teixeira da-Silva JA, (2014) Modeling seed germination in Melissa officinalis L. in response to temperature and water potential. Acta Physiol Plant 36:605–611

Bakhshandeh E, Atashi S, Hafez-Nia M, Pirdashti H (2013) Quantification of the response of germination rate to temperature in sesame (Sesamum indicum). Seed Sci Technol 41:469–473

Bakhshandeh E, Atashi S, Hafeznia M, Pirdashti H, da-Silva JAT (2015) Hydrothermal time analysis of watermelon (Citrullus vulgaris cv.‘Crimson sweet’) seed germination. Acta Physiol Plant 37:1738

Bakhshandeh E, Bradford KJ, Pirdashti H, Vahabinia F, Abdellaoui R (2020a) A new halothermal time model describes seed germination responses to salinity across both sub-and supra-optimal temperatures. Acta Physiol Plantarum 42:1–15

Bakhshandeh E, Gholamhossieni M (2019) Modelling the effects of water stress and temperature on seed germination of radish and cantaloupe. J Plant Growth Regul 38:1402–1411

Bakhshandeh E, Hemmatollah P, Fatemeh V, Mobina G (2020b) Quantification of the effect of environmental factors on seed germination and seedling growth of Eruca (Eruca sativa) using mathematical models. J Plant Growth Regul 39:190–204

Banihani SA (2017) Radish (Raphanus sativus) and diabetes. Nutrients 9:1014

Basit A, Khan S, Sulaiman S, Shah AA (2019) Morphological features of various selected tree species on the greater university campus Peshawar Pakistan. Int. J. Bot Stud. 4:92–97

Bewley JD, Bradford KJ, Hilhorst HWM, Nonogaki H (2013) Seeds: physiology of development, germination and dormancy, 3rd edn. Springer, New York, p 407

Bradford KJ (2002) Applications of hydrothermal time to quantifying and modeling seed germination and dormancy. Weed Sci 50:248–260

Bradford KJ (2017) Water relations in seed germination. In: Seed development and germination, pp 351–396. Routledge

Bradford KJ, Still DW (2004) Applications of hydro time analysis in seed testing. Seed Technol 26:75–85

Ekinci R, Başbağ S, Karademir E, Karademir Ç (2017) The effects of high temperature stress on some agronomic characters in cotton. Pak J Bot 49:503–508

Gummerson RJ (1986) The effect of constant temperatures and osmotic potentials on the germination of sugar beet. J Exp Bot 37:729–741

Hatfield JL, Prueger JH (2015) Temperature extremes: effect on plant growth and development. Weather Clim 10:4–10

Khan M, Ali S, Yaseen T, Ullah S, Zaman A, Iqbal M, Shah S (2019) Eco-taxonomic study of family Poaceae (Gramineae). RADS J Biol Res Appl Sci 10:63–75

Khan S, Hussain W, Shah S, Hussain H, Altyar AE, Ashour ML, Pieroni A (2021) Overcoming tribal boundaries: The biocultural heritage of foraging and cooking wild vegetables among four pathan groups in the Gadoon Valley NW Pakistan. Biology 10:537

Khan S, Ullah A, Ullah S, Saleem MH, Okla MK, Al-Hashimi A, Ali S (2022) Quantifying temperature and osmotic stress impact on seed germination rate and seedling growth of Eruca sativa Mill. via hydrothermal time model. Life 12:400

Luo T, Xian M, Khan MN, Hu L, Xu Z (2018) Estimation of base temperature for germination of rapeseed (Brassica napus L.) using different models. Int J Agric Biol 20:524–530

Mesgaran MB, Onofri A, Mashhadi HR, Cousens RD (2017) Water availability shifts the optimal temperatures for seed germination: a modelling approach. Ecol Modell 351:87–95

Mollaee M, Darbandi EI, Aval MB, Chauhan BS (2020) Germination response of three Setaria species (S. viridis, S. verticillata, and S. glauca) to water potential and temperature using non-linear regression and hydrothermal time models. Acta Physiol Plantarum 42:1–14

Nemeskéri E, Helyes L (2019) Physiological responses of selected vegetable crop species to water stress. Agronomy 9:447

Parmoon G, Moosavi SA, Akbari H, Ebadi A (2015) Quantifying cardinal temperatures and thermal time required for germination of Silybum marianum seed. Crop J 3:145–151

Saberali SF, Nasrabadi NH, Khani ZSSA (2020) Simulation of germination response of watermelon (Citrullus lanatus Thunb.) to temperature and water potential. J Hortic Sci 33:727–741

Sanehkoori FH, Pirdashti H, Bakhshandeh E (2021) Quantifying water stress and temperature effects on camelina (Camelina sativa L.) seed germination. Environ Exp Bot 186:104450

Shah S, Khan S, Bussmann RW, Ali M, Hussain D, Hussain W (2020a) Quantitative ethnobotanical study of Indigenous knowledge on medicinal plants used by the tribal communities of Gokand Valley, District Buner, Khyber Pakhtunkhwa. Pakistan. Plants 9:1001

Shah S, Khan S, Shah SM, Khan S, Khatak L, Rukh G (2020b) Ethnoecological appraisal, mineral and phytochemical analysis of five species of Myrtaceae in University Campus, Peshawar, Pakistan. Pure Appl Biol 10:244–253

Shah S, Khan S, Sulaiman S, Muhammad M, Badshah L, Bussmann RW, Hussain W (2020c) Quantitative study on medicinal plants traded in selected herbal markets of Khyber Pakhtunkhwa, Pakistan. Ethno Res Appl 20:1–36

Shah S, Ullah S, Ali S, Khan A, Ali M, Hassan S (2021) Using mathematical models to evaluate germination rate and seedlings length of chickpea seed (Cicer arietinum L.) to osmotic stress at cardinal temperatures. Plos One 16:e0260990.

Thriunavukkarasu R, Joseph J, Aruni W (2020) Effect of seaweed on seed germination and biochemical constituents of Capsicum annuum. Biocatal Agric Biotechnol 29:101761

Ullah A, Sadaf S, Ullah S, Alshaya H, Okla MK, Alwasel YA, Tariq A (2022) Using halothermal time model to describe Barley (Hordeum vulgare L.) seed germination response to water potential and temperature. Life 12:209

Wang H, Zhao K, Li X, Chen X, Liu W, Wang J (2020) Factors affecting seed germination and emergence of Aegilops tauschii. Weed Res 60:171–181

Yara-Varón E, Li Y, Balcells M, Canela-Garayoa R, Fabiano-Tixier AS, Chemat F (2017) Vegetable oils as alternative solvents for green oleo-extraction, purification and formulation of food and natural products. Molecules 22:1474

Zhang J, Zhao J, Tan Q, Qiu X, Mei S (2021) Comparative transcriptome analysis reveals key genes associated with pigmentation in radish (Raphanus sativus L.) skin and flesh. Sci Rep 11:1–11



We are thankful to the National Agricultural Research Council (NARC) for the provision of high viability rate radish seeds and the Department of Botany, University of Peshawar for lab facilitation.

Author Information

Khan Jalal
Department of Botany, University of Peshawar, Khyber Pakhtunkhwa, Pakistan

Ullah Sami
Department of Botany, University of Peshawar, Khyber Pakhtunkhwa, Pakistan

Shah Sikandar
Department of Botany, University of Peshawar, Khyber Pakhtunkhwa, Pakistan