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Toxicity to terrestrial plants

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Description of key information

In a reliable study (reliability category 2) on C12-14 DMA assessing toxicity in regard to seedling emergence, phytotoxic effects, shoot height and shoot fresh weight for three plant species, the most sensitive endpoint was shoot height for rape: NOEC (21 d) = 10 mg/kg soil dry weight. 

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for terrestrial plants:
10 mg/kg soil dw

Additional information

Toxicity of C12-14 DMA in regard to seedling emergence, phytotoxic effects, shoot height and shoot fresh weight of terrestrial plants was assessed in a reliable (category 2) seedling emergence test over a period of 21 days (OECD 208, compliant to GLP) at nominal concentrations of 10 -32 -100 -320 -1000 mg/kg soil dry weight (DW). Tested plant species were the monocotyledon oats (Gramineae) and the two dicotyledons rape (Brassicaceae) and red clover (Leguminosae). Validity criteria of the OECD-guideline were met except for control seedling emergence of red clover (<70%; reason for RL 2 – no other restrictions regarding reliability). The following NOECs (21 d) were determined:

Shoot height: oat 320 mg/kg DW;rape 10 mg/kg DW; red clover 32 mg/kg DW

Fresh weight: oat 100 mg/kg DW; rape 100 mg/kg DW; red clover 32 mg/kg DW.

Phytotoxic effects: oat (decrease in length) 320 mg/kg DW; rape (decrease in length) 100 mg/kg DW; rape (chlorosis) 100 mg/kg DW

Thus, the lowestNOEC (21 d) of 10 mg/kg DWwas determined forshoot height of rape, and this NOEC will bethe decisive value for PNECsoilderivation for DMA category membersdue to plants being more sensitive to DMA than soil microorganisms or terrestrial macroorganisms