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Seed germination ecology of Sumatran fleabane (Conyza sumatrensis) in relations to various environmental parameters

Published online by Cambridge University Press:  09 August 2021

Gulshan Mahajan Open the ORCID record for Gulshan Mahajan [Opens in a new window] ,
Ashneel Prasad  and
Bhagirath Singh Chauhan
Gulshan Mahajan*
Affiliation:
Research Fellow, Centre for Crop Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, Queensland 4343, Australia; Principal Agronomist, Punjab Agricultural University, Ludhiana, Punjab141004, India
Ashneel Prasad
Affiliation:
Assistant Instructor (Agronomy), Department of Crop Science, College of Agriculture, Fisheries, and Forestry, Fiji National University, Fiji
Bhagirath Singh Chauhan
Affiliation:
Professor, Centre for Crop Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI) and School of Agriculture and Food Sciences (SAFS), University of Queensland, Gatton, Queensland 4343, Australia; Adjunct Professor, Chaudhary Charan Singh Haryana Agricultural University (CCSHAU), Hisar, Haryana125004, India
*
Author for correspondence: Gulshan Mahajan, Centre for Crop Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, QLD 4343, Australia. (Email: g.mahajan@uq.edu.au)
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Abstract

Sumatran fleabane [Conyza sumatrensis (Retz.) Walker] is an emerging weed in the Australian cropping region. Populations resistant to glyphosate have evolved in Australia, creating the demand for information regarding the seed germination ecology of glyphosate-resistant (R) and glyphosate-susceptible (S) populations of C. sumatrensis. A study was conducted to examine the effects of temperature, light intensity, salt stress, osmotic stress, and burial depth on the germination and emergence of two populations (R and S) of C. sumatrensis. Both populations were able to germinate over a wide range of alternating day/night temperatures (15/5 to 35/25 C). In light/dark conditions, the R population had higher germination than the S population at 20/10 and 35/25 C. In the dark, the R population had higher germination than the S population at 25/15 C. In the dark, germination was inhibited at 30/20 C and above. Averaged over populations, seed germination of C. sumatrensis was reduced by 97% at zero light intensity (completely dark conditions) compared with full light intensity. Seed germination of C. sumatrensis was reduced by 17% and 85% at osmotic potentials of −0.4, and −0.8 MPa, respectively, compared with the control treatment. The R population had lower germination (57%) than the S population (72%) at a sodium chloride concentration of 80 mM. Seed germination was highest on the soil surface and emergence was reduced by 87% and 90% at burial depths of 0.5 and 1.0 cm, respectively. Knowledge gained from this study suggests that a shallow-tillage operation to bury weed seeds in conventional tillage systems and retention of high residue cover on the soil surface in zero-till systems may inhibit the germination of C. sumatrensis. This study also warrants that the R population may have a greater risk of invasion over a greater part of a year due to germination over a broader temperature range.

Keywords

Burial depthemergencelightsalt stressseedshadetemperaturewater stress
Type
Research Article
Information
Weed Science , Volume 69 , Issue 6 , November 2021 , pp. 687 - 694
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Nathan S. Boyd, Gulf Coast Research and Education Center

*

This article has been updated since its original publication. See https://doi.org/10.1017/wsc.2021.63.

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