Weed Research (1998) 38, 389-395

P. Boutsalis and S.B. Powles (1998)
Seedbank characteristics of herbicide-resistant and susceptible Sisymbrium orientale
Weed Research 38 (5), 389-395
Abstract: Germinability and emergence of Sisymbrium orientale Torn. seed susceptible and resistant to acetolactate synthase (ALS)-inhibiting herbicides was investigated. Freshly harvested seed from a field containing confirmed ALS-inhibiting herbicide-resistant (ALS resistant) plants and susceptible seed from a nearby field was found to exhibit strong innate dormancy initially. However, germinability of seed from both resistant and susceptible biotypes increased to 50% after 1 month, indicating that innate dormancy had been partly relieved. No significant differences in behaviour of resistant vs. susceptible biotypes were recorded over 3 years. Field experiments conducted over a 4-year experimental period, to determine seedbank longevity in the absence of fresh seed input to the seedbank, revealed S. orientale to have a short seedbank life. Cultivation stimulated seedling emergence compared with no-tillage seedling emergence. These findings establish that persistence of S. orientale in the seedbank is short if fresh seed production is prevented. This knowledge can be used to manage populations of S. orientale, especially in cases such as this where the population is herbicide-resistant.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Stephen B. Powles, Peter Boutsalis

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sisymbrium orientale (weed)