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ALLELOPATHY SYMPOSIUM

Laboratory Bioassay for Phytotoxicity

An Example from Wheat Straw

^a Dep. of Agric. Sci. (Weed Sci.), The Royal Veterinary and Agric. Univ., Thorvaldsensvej 40, DK-1871 Frederiksberg C, Copenhagen, Denmark
^b Dep. of Botany, Panjab Univ., Chandigarh 160014, India

Corresponding author (allelopathy{at}satyam.net.in)

Allelopathy involves complex plant x plant chemical interactions. Although a large number of laboratory bioassays have proposed to demonstrate allelopathy, most of them have little or no relevance in terms of explaining behavior in the field. In this paper, we discuss the phytotoxicity of wheat (Triticum aestivum L.) straw leachate to the seedling growth of perennial ryegrass (Lolium perenne L.). The objective of this study was to discuss the significance of (i) soil, (ii) leachate concentrations in bioassays of plant debris and soil, (iii) the role of N fertilizer in overcoming plant growth inhibition, (iv) organic molecules in plant inhibition, and (v) actual assay species. The results show the phytotoxic nature of wheat straw leachate (WSL) and the possible involvement of organic molecules in the growth inhibition of perennial ryegrass. However, laboratory studies can not demonstrate allelopathy as the sole factor responsible for the observed growth inhibition.

Abbreviations: FS, full strength • WSL, wheat straw leachate

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