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  • Author or Editor: Barbara Stiehl x
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Little evidence is available concerning possible allelopathic effects of the thiocyanate ion (SCN-), a known toxin commonly found in plants of the Brassicaceae (crucifers). Seeds and seedlings of 39 species of crop plants were exposed to ionic thiocyanate (0.5 mM SCN- supplied as KSCN) to determine their relative sensitivity. Percent germination was unaffected by SCN- for all the species tested. Thiocyanate ion inhibited the total seedling (shoot and root) extension of 46% of the species tested, with 38% of the species showing inhibition of shoot and 49% showing inhibition of root extension. This demonstrates that SCN- has the capacity to harm a range of species. However, the toxicity was selective in that 44% of the test species were unaffected by exposure to SCN-. Wide differences in seed weight among species, in incubation time, and also systematics were major sources of variation for species sensitivity to SCN-.

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