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Factors affecting turnipweed (Rapistrum rugosum) seed germination in southern Australia

Published online by Cambridge University Press:  20 January 2017

Gurjeet Gill
Affiliation:
School of Agriculture, Food and Wine, The University of Adelaide, Roseworthy Campus, South Australia, 5371, Australia
Christopher Preston
Affiliation:
School of Agriculture, Food and Wine, The University of Adelaide, Waite Campus, South Australia, 5064, Australia

Abstract

Experiments were conducted on the seed of turnipweed collected from southern Australia. Seed germinated over a range of temperatures (25/15, 20/12, and 15/9 C) under both light/dark and dark conditions. Regardless of the light condition, germination of naked seed (63 to 88%) was greater than the seed in intact silique (0 to 13%). Seed germination was relatively unaffected (greater than 60%) at a low level of salinity (80 mM NaCl), and some germination occurred even at 160 mM NaCl (11%). Seed germination decreased as osmotic potential decreased from 0 to −1.0 MPa; however, some germination occurred even at an osmotic potential of −1.0 MPa (22%). Seed germination was greater than 76% over a pH range of 4 to 10. Seedling emergence of turnipweed was greater (60%) for seed buried at 1 cm than on the soil surface (23%). No seedlings emerged from seed buried at 5 cm. Information gained in this study will be important in developing a better understanding of the requirements for turnipweed germination and emergence.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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