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Seed germination ecology of southeastern Australian rigid ryegrass (Lolium rigidum) populations

Published online by Cambridge University Press:  11 May 2021

Michael Thompson Open the ORCID record for Michael Thompson [Opens in a new window] ,
Gulshan Mahajan  and
Bhagirath S. Chauhan
Michael Thompson*
Affiliation:
Postdoctoral Research Fellow, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, Queensland, Australia
Gulshan Mahajan
Affiliation:
Research Officer, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, Queensland, Australia
Bhagirath S. Chauhan
Affiliation:
Professor, School of Agriculture and Food Sciences (SAFS), Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, Queensland, Australia
*
Author for correspondence: Michael Thompson, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton 4343, QLD, Australia. (Email: michael.thompson1@uq.edu.au)
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Abstract

Herbicide resistance is an increasing issue in many weed species, including rigid ryegrass (Lolium rigidum Gaudin); a major weed of winter cropping systems in southern Australia. Recently, this weed has also been found in summer crops in the southeastern region of Australia. Effective control of this herbicide-resistant weed across southeastern Australia requires alternative management strategies. These strategies can be informed by analyses on the interaction of germinable seeds with their regional environments and by identifying the differences between populations of varying herbicide-resistance levels. In this study, we explore how various environmental factors differentially affect the seed germination and seedling emergence of three L. rigidum populations, including one glyphosate-resistant population (GR), one glyphosate-susceptible population (GS), and one population of unknown resistance status (CC04). Germination was greater than 90% for all populations at each temperature regime, except 15/5 C. Populations germinated at a lower rate under 15/5 C, ranging from 74% to 87% germination. Salt stress had a similar effect on the germination of all populations, with 0% germination occurring at 250 mM salt stress. Population GS had greater tolerance to osmotic stress, with 65% germination at −0.4 MPa compared with 47% and 43% germination for CC04 and GR, respectively; however, germination was inhibited at −0.8 and −1.6 MPa for all populations. All populations had lower germination when placed in complete darkness as opposed to alternating light/dark. Germination in darkness was lower for CC04 (69%) than GR (83%) and GS (83%). Seedling emergence declined with increasing burial depth with the lowest emergence occuring at 8 cm (37%) when averaged over the populations. These results indicate that L. rigidum can survive under a range of environmental variables and that the extent of survival differs based on population; however, there was no difference based on herbicide-resistance status.

Keywords

Burial depthemergenceherbicide resistanceosmotic potentialweeds
Type
Research Article
Information
Weed Science , Volume 69 , Issue 4 , July 2021 , pp. 454 - 460
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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

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