Effects of trifluralin on root morphology and mineral status of wheat triticum aestivum cultivar neepawa seedlings

Olson, B.M.; Mckercher, R.B.; Halstead, E.H.

Weed Science 32(3): 382-387


ISSN/ISBN: 0043-1745
Accession: 005331847

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Growth chamber studies using 1 soil investigated the effects of trifluralin (.alpha., .alpha.,.alpha.-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) at 0.0, 0.4 and 0.8 ppmw .mu.g/g plant dry weight on the root development and the mineral status of wheat seedlings. The 0.8-ppmw trifluralin rate increased the number of seminal roots, reduced lateral root production, decreased root extension, caused root tips to swell (club-like appearance) and reduced root dry weights. Only slight damage to the seedlings was caused by 0.4-ppmw trifluralin. Towards the end of the 2-wk growth period, damaged seedlings showed signs of recovery, which included an increased number of seminal roots, development of normal root extensions from clubbed root tips and development of normal lateral root patterns. Trifluralin increased percent Ca and Mg and decreased percent N, P and K in wheat plants. The nutrient concentrations were affected more in 21-day-old plants than in 35-day-old plants, indicating the wheat seedlings were able to recover from trifluralin injury.