Autotoxicity of wheat (Triticum aestivum L.) as determined by laboratory bioassays

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Wheat varietal autotoxicity and varietal allelopathy were assessed based on plant extract and root exudate bioassays under laboratory conditions. Aqueous extract of wheat differed in varietal autotoxicity and varietal allelopathy, inhibiting wheat germination by 2-21%, radicle growth by 15-30%, and coleoptile growth by 5-20%, depending on the combination of the receiver and donor. Extracts of cv Triller or cv Currawong were more allelopathic to other wheat varieties than cv Batavia and cv Federation. Triller extract was more autotoxic than Federation. Assessment of root exudates by the equal-compartment-agar-method further identified the significant differences in varietal autotoxicity and varietal allelopathy of root exudates between wheat varieties, with root exudates of Triller or Batavia showing stronger autotoxic or allelopathic effects than Currawong or Federation. The varietal autotoxicity and allelopathy of root exudates also showed a characteristic radial inhibitory pattern in the agar growth medium. These results suggest that careful selection of suitable wheat varieties is necessary in a continuous cropping system in order to minimize the negative impacts of varietal allelopathy and varietal autotoxicity. Factors affecting autotoxicity in the field and strategies in autotoxicity management are discussed.
Original languageEnglish
Pages (from-to)85-93
Number of pages9
JournalPlant and Soil
Volume296
Issue number1-2
DOIs
Publication statusPublished - Jul 2007

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allelopathy
root exudates
bioassay
Triticum aestivum
bioassays
wheat
agar
extracts
root radicle
continuous cropping
plant extract
coleoptiles
plant extracts
cropping systems
laboratory
germination
culture media
water

Cite this

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title = "Autotoxicity of wheat (Triticum aestivum L.) as determined by laboratory bioassays",
abstract = "Wheat varietal autotoxicity and varietal allelopathy were assessed based on plant extract and root exudate bioassays under laboratory conditions. Aqueous extract of wheat differed in varietal autotoxicity and varietal allelopathy, inhibiting wheat germination by 2-21{\%}, radicle growth by 15-30{\%}, and coleoptile growth by 5-20{\%}, depending on the combination of the receiver and donor. Extracts of cv Triller or cv Currawong were more allelopathic to other wheat varieties than cv Batavia and cv Federation. Triller extract was more autotoxic than Federation. Assessment of root exudates by the equal-compartment-agar-method further identified the significant differences in varietal autotoxicity and varietal allelopathy of root exudates between wheat varieties, with root exudates of Triller or Batavia showing stronger autotoxic or allelopathic effects than Currawong or Federation. The varietal autotoxicity and allelopathy of root exudates also showed a characteristic radial inhibitory pattern in the agar growth medium. These results suggest that careful selection of suitable wheat varieties is necessary in a continuous cropping system in order to minimize the negative impacts of varietal allelopathy and varietal autotoxicity. Factors affecting autotoxicity in the field and strategies in autotoxicity management are discussed.",
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Autotoxicity of wheat (Triticum aestivum L.) as determined by laboratory bioassays. / Wu, Hanwen; Pratley, Jim; Lemerle, Deirdre; An, Min; Liu, De Li.

In: Plant and Soil, Vol. 296, No. 1-2, 07.2007, p. 85-93.

Research output: Contribution to journalArticle

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T1 - Autotoxicity of wheat (Triticum aestivum L.) as determined by laboratory bioassays

AU - Wu, Hanwen

AU - Pratley, Jim

AU - Lemerle, Deirdre

AU - An, Min

AU - Liu, De Li

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N2 - Wheat varietal autotoxicity and varietal allelopathy were assessed based on plant extract and root exudate bioassays under laboratory conditions. Aqueous extract of wheat differed in varietal autotoxicity and varietal allelopathy, inhibiting wheat germination by 2-21%, radicle growth by 15-30%, and coleoptile growth by 5-20%, depending on the combination of the receiver and donor. Extracts of cv Triller or cv Currawong were more allelopathic to other wheat varieties than cv Batavia and cv Federation. Triller extract was more autotoxic than Federation. Assessment of root exudates by the equal-compartment-agar-method further identified the significant differences in varietal autotoxicity and varietal allelopathy of root exudates between wheat varieties, with root exudates of Triller or Batavia showing stronger autotoxic or allelopathic effects than Currawong or Federation. The varietal autotoxicity and allelopathy of root exudates also showed a characteristic radial inhibitory pattern in the agar growth medium. These results suggest that careful selection of suitable wheat varieties is necessary in a continuous cropping system in order to minimize the negative impacts of varietal allelopathy and varietal autotoxicity. Factors affecting autotoxicity in the field and strategies in autotoxicity management are discussed.

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