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Seed germination and seedling emergence of threehorn bedstraw (Galium tricornutum)

Published online by Cambridge University Press:  20 January 2017

Bhagirath S. Chauhan ,
Gurjeet Gill  and
Christopher Preston
Gurjeet Gill
Affiliation:
Discipline of Agricultural and Animal Science, The University of Adelaide, Roseworthy Campus, South Australia, Australia 5371
Christopher Preston
Affiliation:
Discipline of Plant and Food Science, The University of Adelaide, Waite Campus, South Australia, Australia 5064
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Abstract

Threehorn bedstraw is an important dicotyledonous weed of winter crops in southern Australia, which can be difficult to control in some field crops. Knowledge of the germination ecology of this weed would facilitate development of effective weed control programs. Seed germination in the laboratory was greater for seeds that after-ripened while buried in the soil relative to those that after-ripened on the soil surface. The timing of greatest seed germination in the laboratory was found to coincide with the period of low temperature in the field. Seed germination of threehorn bedstraw was moderately sensitive to salt stress but moderately tolerant to osmotic stress. Seeds of threehorn bedstraw germinated over a broad range of pH from 4 to 10. No seedlings emerged from seeds placed on the soil surface. Maximum seedling emergence occurred at depths of 1 to 2 cm (89 to 91%) and declined at greater depths.

Keywords

Threehorn bedstraw, Galium tricornutum Dandy GALTCGerminationstorage environmentosmotic stresspHweed seed
Type
Research Article
Information
Weed Science , Volume 54 , Issue 5 , October 2006 , pp. 867 - 872
Copyright
Copyright © Weed Science Society of America 

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