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Germination ecology of four African mustard (Brassica tournefortii Gouan) populations in the eastern region of Australia

Published online by Cambridge University Press:  19 April 2021

Sohraab Singh ,
Gulshan Mahajan Open the ORCID record for Gulshan Mahajan [Opens in a new window] ,
Rajandeep Singh  and
Bhagirath S. Chauhan
Sohraab Singh
Affiliation:
Former Research Scholar, University of Queensland, Gatton, Queensland, Australia
Gulshan Mahajan*
Affiliation:
Research Fellow, Centre for Crop Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, Queensland, Australia; Principal Agronomist, Punjab Agricultural University, Ludhiana, Punjab, India
Rajandeep Singh
Affiliation:
Former Research Scholar, University of Queensland, Gatton, Queensland, Australia
Bhagirath S. 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, Australia
*
Author for correspondence: Gulshan Mahajan, Centre for Crop Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Gatton, QLD4343, Australia. (Email: g.mahajan@uq.edu.au)
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Abstract

African mustard (Brassica tournefortii Gouan) is a problematic winter annual weed in Australia. Germination ecology of B. tournefortii may change in response to the maternal environments or habitats in which the plants grow. A study was conducted to evaluate the effect of environmental factors on germination and emergence of four populations of B. tournefortii that were collected from different fields. Averaged over populations, germination was stimulated by dark and was higher at 25/15 C (92%) compared with 15/5 C (76%) and 35/25 C (45%). Averaged over light/dark regimes, at the lowest temperature regime (15/5 C), population A had higher germination than population D; however, at the highest temperature regime (35/25 C), population D had higher germination than population A. Populations B and C had higher germination in the temperature range of 25/15 C and 30/20 C compared with 15/5 C, 20/10 C, and 35/25 C. Seeds germinated at a wide range of alternating day/night temperatures (15/5 to 35/25 C), suggesting that seeds can germinate throughout the year if other optimum conditions are available. Population A was more tolerant to water and salt stress than population D. The sodium chloride concentration and osmotic potential required to inhibit 50% germination of population A were 68 mM and −0.60 MPa, respectively. Averaged over populations, seeds placed at 1-cm soil depth had the highest emergence (54%), and burial depth of 8 cm resulted in 28% seedling emergence. Averaged over populations, wheat residue retention at 6,000 kg ha−1 resulted in greater seedling emergence than the residue amount of 1,000 kg ha−1. The results suggest that B. tournefortii will be favored in no-till systems and that the seedbank of B. tournefortii could be managed by tillage regimes that bury its seeds below 8-cm depths and restrict seedling emergence and growth of new plants.

Keywords

Crop residueemergencelightosmotic potentialsalt stresstemperature
Type
Research Article
Information
Weed Science , Volume 69 , Issue 4 , July 2021 , pp. 461 - 467
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Copyright
© Weed Science Society of America, 2021

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Footnotes

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

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