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1 September 2006 African mustard (Brassica tournefortii ) germination in southern Australia
Bhagirath S. Chauhan, Gurjeet Gill, Christopher Preston
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Germination of African mustard seeds collected from southern Australia was not influenced by light conditions at the optimum temperature of 20/12 C. However, seed germination was inhibited by light at the lower temperature (15/9 C). Presence of light increased the sensitivity of seeds to low temperature, as well as salt and osmotic stress. In dark conditions, seed germination was relatively unaffected at a low level of salinity (80 mM NaCl) but decreased even at 10 mM NaCl in light/dark conditions. In the dark, seed germination was unaffected up to an osmotic potential of −0.6 MPa but declined thereafter. Seeds of African mustard germinated over a broad range of pH from 4 to 10. Seed germination was stimulated by potassium nitrate (from 0.005 to 0.04 M) and gibberellic acid (0.001 M). Seedling emergence of African mustard was the greatest (51%) for seeds buried at 1 cm but no seedlings emerged from seeds placed at a depth of 5 cm. At the end of the growing season, seed decay (77 to 87%) and dormant (12 to 18%) components were similar among different seed burial depths. Information gained in this study will be important in developing a better understanding of the requirements for African mustard germination and emergence.

Nomenclature: African mustard, Brassica tournefortii Gouan BRATO.

Bhagirath S. Chauhan, Gurjeet Gill, and Christopher Preston "African mustard (Brassica tournefortii ) germination in southern Australia," Weed Science 54(5), 891-897, (1 September 2006).
Received: 21 March 2006; Accepted: 1 May 2006; Published: 1 September 2006
osmotic potential
salt stress
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