Germination rates of Solanum sisymbriifolium: temperature response models, effects of temperature fluctuations and soil water potential

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Abstract

Four temperature response models were compared describing the emergence rate of Solanum sisymbriifolium (L.) over a broad range of suboptimal temperatures and at different soil water potentials. In the laboratory, the effects were tested on germination rates at constant (9.1-21.8 degrees C) and diurnally fluctuating temperatures at different soil water potentials. Linear, 010, expolinear and quadratic models were fitted to the data on rate of emergence against temperature. For model validation, field emergence was monitored in 11 sowings conducted in 2001-2004. Emergence rate increased with temperature and was relatively high at soil water potentials in the range of -0.21 MPa to -2.6 x 10(-3) MPa, but was almost zero at -0.96 MPa and -1.8 X 10(-3) MPa. Diurnal temperature fluctuations did not have a differing influence on germination rates or final germination percentages compared with constant temperatures. The expolinear and the quadratic models were most accurate in explaining variation of laboratory data, especially at temperatures close to the minimum germination temperature of S. sisymbriffolium. These two models had root mean square errors for predicting field emergence rates (5.9 to 38.4d) of 0.81 and 0.87d, respectively, and were considered more appropriate to predict the time to 50% germination for crops grown in conditions near their 'base temperature' than the widely used linear temperature (thermal time) models. The Gompertz function was fitted to percentage germination versus the time-accumulated germination rate (using the expolinear function to describe the rate-temperature relation). This combined model adequately predicted the temporal pattern of emergence in the field.
Original languageEnglish
Pages (from-to)221-231
JournalSeed Science Research
Volume17
Issue number3
DOIs
Publication statusPublished - 2007

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Solanum sisymbriifolium
soil water potential
germination
temperature
model validation

Keywords

  • potato cyst nematodes
  • hydrothermal time model
  • seed-germination
  • trap crop
  • alternating temperatures
  • field performance
  • growth
  • sisymbriifolium
  • emergence
  • constant

Cite this

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title = "Germination rates of Solanum sisymbriifolium: temperature response models, effects of temperature fluctuations and soil water potential",
abstract = "Four temperature response models were compared describing the emergence rate of Solanum sisymbriifolium (L.) over a broad range of suboptimal temperatures and at different soil water potentials. In the laboratory, the effects were tested on germination rates at constant (9.1-21.8 degrees C) and diurnally fluctuating temperatures at different soil water potentials. Linear, 010, expolinear and quadratic models were fitted to the data on rate of emergence against temperature. For model validation, field emergence was monitored in 11 sowings conducted in 2001-2004. Emergence rate increased with temperature and was relatively high at soil water potentials in the range of -0.21 MPa to -2.6 x 10(-3) MPa, but was almost zero at -0.96 MPa and -1.8 X 10(-3) MPa. Diurnal temperature fluctuations did not have a differing influence on germination rates or final germination percentages compared with constant temperatures. The expolinear and the quadratic models were most accurate in explaining variation of laboratory data, especially at temperatures close to the minimum germination temperature of S. sisymbriffolium. These two models had root mean square errors for predicting field emergence rates (5.9 to 38.4d) of 0.81 and 0.87d, respectively, and were considered more appropriate to predict the time to 50{\%} germination for crops grown in conditions near their 'base temperature' than the widely used linear temperature (thermal time) models. The Gompertz function was fitted to percentage germination versus the time-accumulated germination rate (using the expolinear function to describe the rate-temperature relation). This combined model adequately predicted the temporal pattern of emergence in the field.",
keywords = "potato cyst nematodes, hydrothermal time model, seed-germination, trap crop, alternating temperatures, field performance, growth, sisymbriifolium, emergence, constant",
author = "B.G.H. Timmermans and J. Vos and {van Nieuwburg}, J.G.W. and T.J. Stomph and {van der Putten}, P.E.L.",
year = "2007",
doi = "10.1017/S0960258507785628",
language = "English",
volume = "17",
pages = "221--231",
journal = "Seed Science Research",
issn = "0960-2585",
publisher = "Cambridge University Press",
number = "3",

}

TY - JOUR

T1 - Germination rates of Solanum sisymbriifolium: temperature response models, effects of temperature fluctuations and soil water potential

AU - Timmermans, B.G.H.

AU - Vos, J.

AU - van Nieuwburg, J.G.W.

AU - Stomph, T.J.

AU - van der Putten, P.E.L.

PY - 2007

Y1 - 2007

N2 - Four temperature response models were compared describing the emergence rate of Solanum sisymbriifolium (L.) over a broad range of suboptimal temperatures and at different soil water potentials. In the laboratory, the effects were tested on germination rates at constant (9.1-21.8 degrees C) and diurnally fluctuating temperatures at different soil water potentials. Linear, 010, expolinear and quadratic models were fitted to the data on rate of emergence against temperature. For model validation, field emergence was monitored in 11 sowings conducted in 2001-2004. Emergence rate increased with temperature and was relatively high at soil water potentials in the range of -0.21 MPa to -2.6 x 10(-3) MPa, but was almost zero at -0.96 MPa and -1.8 X 10(-3) MPa. Diurnal temperature fluctuations did not have a differing influence on germination rates or final germination percentages compared with constant temperatures. The expolinear and the quadratic models were most accurate in explaining variation of laboratory data, especially at temperatures close to the minimum germination temperature of S. sisymbriffolium. These two models had root mean square errors for predicting field emergence rates (5.9 to 38.4d) of 0.81 and 0.87d, respectively, and were considered more appropriate to predict the time to 50% germination for crops grown in conditions near their 'base temperature' than the widely used linear temperature (thermal time) models. The Gompertz function was fitted to percentage germination versus the time-accumulated germination rate (using the expolinear function to describe the rate-temperature relation). This combined model adequately predicted the temporal pattern of emergence in the field.

AB - Four temperature response models were compared describing the emergence rate of Solanum sisymbriifolium (L.) over a broad range of suboptimal temperatures and at different soil water potentials. In the laboratory, the effects were tested on germination rates at constant (9.1-21.8 degrees C) and diurnally fluctuating temperatures at different soil water potentials. Linear, 010, expolinear and quadratic models were fitted to the data on rate of emergence against temperature. For model validation, field emergence was monitored in 11 sowings conducted in 2001-2004. Emergence rate increased with temperature and was relatively high at soil water potentials in the range of -0.21 MPa to -2.6 x 10(-3) MPa, but was almost zero at -0.96 MPa and -1.8 X 10(-3) MPa. Diurnal temperature fluctuations did not have a differing influence on germination rates or final germination percentages compared with constant temperatures. The expolinear and the quadratic models were most accurate in explaining variation of laboratory data, especially at temperatures close to the minimum germination temperature of S. sisymbriffolium. These two models had root mean square errors for predicting field emergence rates (5.9 to 38.4d) of 0.81 and 0.87d, respectively, and were considered more appropriate to predict the time to 50% germination for crops grown in conditions near their 'base temperature' than the widely used linear temperature (thermal time) models. The Gompertz function was fitted to percentage germination versus the time-accumulated germination rate (using the expolinear function to describe the rate-temperature relation). This combined model adequately predicted the temporal pattern of emergence in the field.

KW - potato cyst nematodes

KW - hydrothermal time model

KW - seed-germination

KW - trap crop

KW - alternating temperatures

KW - field performance

KW - growth

KW - sisymbriifolium

KW - emergence

KW - constant

U2 - 10.1017/S0960258507785628

DO - 10.1017/S0960258507785628

M3 - Article

VL - 17

SP - 221

EP - 231

JO - Seed Science Research

JF - Seed Science Research

SN - 0960-2585

IS - 3

ER -