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Germination Ecology of Two Australian Biotypes of Ragweed Parthenium (Parthenium hysterophorus) Relates to Their Invasiveness

  • Ali A. Bajwa (a1), Bhagirath S. Chauhan (a2) and Steve W. Adkins (a1)


Ragweed parthenium is a highly invasive weed species in several countries, including Australia. Laboratory experiments were conducted to evaluate the effect of temperature, light, salinity, pH, and moisture on germination of two Australian biotypes of ragweed parthenium: Clermont (highly invasive) and Toogoolawah (noninvasive). Although seeds of both biotypes could germinate under complete darkness, germination was improved by 20% to 49% under a 12-h photoperiod. Both biotypes germinated over a wide range of constant (8 to 35 C), and alternating day/night (15/5 to 35/25 C) temperatures. However, the Clermont biotype exhibited significantly higher germination than Toogoolawah biotype over the range of temperatures studied. Highest germination of Clermont (100%) and Toogoolawah (97%) was observed at constant temperatures of 14 to 23 C and 23 C, respectively. The best alternating day/night temperature for germination of both biotypes was 25/15 C. Clermont also germinated better than Toogoolawah under osmotic- and salt-stress conditions. Osmotic stress had moderate negative effects on germination, with 52% and 36% of the Clermont and Toogoolawah seeds able to germinate at −0.60 MPa, respectively. Complete germination inhibition for both biotypes was observed at an osmotic potential of −1.2 MPa. Both biotypes also germinated at a very high sodium chloride (NaCl) concentration of 250 mM. A 50% reduction in germination of Toogoolawah and Clermont was caused by 99 and 154 mM NaCl, respectively. Germination of the Clermont biotype was not affected by a wide range of pH (4.0 to 10.0), whereas the strong acidic and alkaline pH levels (4.0 and 10.0) caused 18% and 25% reductions in germination of the Toogoolawah biotype compared with control. The Clermont biotype had a higher ability to germinate across all treatments compared with the Toogoolawah biotype, which might be a contributing factor toward the high invasive ability of the former compared with the latter.


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Associate Editor for this paper: Muthukumar V. Bagavathiannan, Texas A&M University.



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Adkins, S, Shabbir, A (2014) Biology, ecology and management of the invasive parthenium weed (Parthenium hysterophorus L.). Pest Manag Sci 70:10231029
Bajwa, AA, Chauhan, BS, Adkins, S (2017) Morphological, physiological and biochemical responses of two Australian biotypes of Parthenium hysterophorus L. to different soil moisture regimes. Environ Sci Pollut Res 24:1618616194
Bajwa, AA, Chauhan, BS, Farooq, M, Shabbir, A, Adkins, SW (2016) What do we really know about alien plant invasion? A review of the invasion mechanism of one of the world’s worst weeds. Planta 244:3957
Bajwa, AA, Mahajan, G, Chauhan, BS (2015) Nonconventional weed management strategies for modern agriculture. Weed Sci 63:723747
Chachalis, D, Reddy, KN (2000) Factors affecting Campsis radicans seed germination and seedling emergence. Weed Sci 48:212216
Chauhan, BS, Gill, G, Preston, C (2006) Factors affecting seed germination of annual sowthistle (Sonchus oleraceus) in southern Australia. Weed Sci 54:854860
Chauhan, BS, Johnson, DE (2008) Germination ecology of two troublesome Asteraceae species of rainfed rice: Siam weed (Chromolaena odorata) and coat buttons (Tridax procumbens). Weed Sci 56:567573
Chauhan, BS, Johnson, DE (2010) The role of seed ecology in improving weed management strategies in the tropics. Adv Agron 105:221262
de Caritat, P, Cooper, M, Wilford, J (2011) The pH of Australian soils: field results from a national survey. Soil Res 49:173182
Farooq, M, Hussain, M, Wakeel, A, Siddique, KH (2015) Salt stress in maize: effects, resistance mechanisms, and management. a review. Agron Sust Dev 35:461481
Hanif, Z, Adkins, SW, Prentis, PJ, Navie, SC, O’Donnell, C (2012) Characterization of the reproductive behavior and invasive potential of parthenium weed in Australia. Pak J Weed Sci Res 18:767774
Karlsson, LM, Tamado, T, Milberg, P (2008) Inter-species comparison of seed dormancy and germination of six annual Asteraceae weeds in an ecological context. Seed Sci Res 18:3545
Khurshid, S, Nasim, G, Bajwa, R, Adkins, S (2012) Growth responses of Parthenium hysterophorus L. growing under salt stress. Pak J Weed Sci Res 18:5164
Michel, BE (1983) Evaluation of the water potentials of solutions of polyethylene glycol 8000 both in the absence and presence of other solutes. Plant Physiol 72:6670
Navie, SC (2002) The Biology of Parthenium hysterophorous L. in Australia (Ph.D dissertation Brisbane, Australia: University of Queensland. 71 p
Nguyen, T, Bajwa, AA, Navie, S, O’Donnell, C, Adkins, S (2017a) Parthenium weed (Parthenium hysterophorus L.) and climate change: the effect of CO2 concentration, temperature, and water deficit on growth and reproduction of two biotypes. Environ Sci Pollut Res 24:1072710739
Nguyen, TLT, Bajwa, AA, Navie, SC, O’Donnell, C, Adkins, SW (2017b) The soil seedbank of pasture communities in central Queensland invaded by Parthenium hysterophorus L. Range Ecol Manag 70:244254
Pandey, HN, Dubey, SK (1988) Achene germination of Parthenium hysterophorus L.: effects of light, temperature, provenance and achene size. Weed Res 28:185190
Rengasamy, P (2006) World salinization with emphasis on Australia. J Exp Bot 57:10171023
Rengasamy, P (2010) Soil processes affecting crop production in salt-affected soils. Func Plant Biol 37:613620
Tamado, T, Schutz, W, Milberg, P (2002) Germination ecology of the weed Parthenium hysterophorus in eastern Ethiopia. Ann Appl Biol 140:263270
Williams, JD, Groves, RH (1980) The influence of temperature and photoperiod on growth and development of Parthenium hysterophorus L. Weed Res 20:4752


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Germination Ecology of Two Australian Biotypes of Ragweed Parthenium (Parthenium hysterophorus) Relates to Their Invasiveness

  • Ali A. Bajwa (a1), Bhagirath S. Chauhan (a2) and Steve W. Adkins (a1)


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