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Modeling germination and shoot-radicle elongation of Ambrosia artemisiifolia

Published online by Cambridge University Press:  12 June 2017

Anil Shrestha ,
Erivelton S. Roman ,
A. Gordon Thomas  and
Clarence J. Swanton
Anil Shrestha
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Erivelton S. Roman
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, Ontario, Canada N1G 2W1
A. Gordon Thomas
Affiliation:
Agriculture and Agri-Food Canada, Saskatoon Research Centre, Saskatoon, Canada S7N 0X2
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Abstract

Laboratory studies were conducted to describe germination and seedling elongation of Ambrosia artemisiifolia L. (common ragweed) seed. The germination process was tested for the interaction of temperature and water potential across eight thermo-periods (7.5, 12.5, 17.5, 22.5, 27.5, 32.5, 37.5, and 42.5 C) and 12 water potentials (0, −0.03, −0.06, −0.1, −0.2, −0.4, −0.6, −0.9, −1.2, −1.5, −1.8, and −2.1 mPa). The rate of seedling shoot and radicle elongation was described as a function of temperature and tested for eight day: night temperature treatments (10: 5, 15 : 10, 20 : 15, 25 : 20, 30 : 25, 35 : 30, 40 : 35, and 45 : 40 C). The rate of germination was mathematically modeled by a Weibull function. Probit analysis was used to determine the cardinal temperatures (base, optimum, and maximum) and base water potential (αb). The base temperature (Tb), optimum temperature (Topt), maximum temperature (Tmax), and αb for A. artemisiifolia germination were estimated as 3.6, 30.9, and 40 C and −0.8 mPa, respectively. The rates of shoot and radicle elongation were described by regression models. The Tb, Topt, and Tmax for shoot and radicle elongation were estimated as 7.7 and 5.1, 29.5 and 31.4, and 43.0 and 44.3 C, respectively. A mathematical model describing the process of A. artemisiifolia seed germination in terms of hydrothermal time (θHT) was derived. The θHT model described the phenology of A. artemisiifolia seed germination using a single curve generated from the relationship of temperature and water potential. This model can help in predicting germination and emergence of A. artemisiifolia under field conditions.

Keywords

Ambrosia artemisiifolia L. AMBEL, common ragweedBase temperaturebase water potentialcardinal temperaturesWeibull functionhydrothermal timeecophysiological modelsintegrated weed managementAMBEL
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 5 , October 1999 , pp. 557 - 562
Copyright
Copyright © 1999 by the Weed Science Society of America 

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