ABSTRACT Analyses of multiple field experiments indicated that the incidence and relative abundance of root-colonizing phlD+ Pseudomonas spp. were influenced by crop rotation, tillage, organic amendments, and chemical seed treatments in subtle but reproducible ways. In no-till corn plots, 2-year rotations with soybean resulted in plants with approximately twofold fewer phlD+ pseudomonads per gr...

Z. Naturforsch. 4 8c , 2 8 8 -2 9 3 (1993); received November 3, 1992 Sethoxydim, Growth Inhibition, Cell Cycle, Fatty Acids The mechanism of selective herbicidal action of sethoxydim was investigated by using cul­ tured root tips of corn and pea. Sethoxydim inhibited the growth of susceptible corn root at concentrations of 3 nM and above, but did not affect that of pea at 0.1 m M . Meristemati...

abstract methods of tillage and organic matter affect root growth and distribution and therefore nutrient uptake by plant and its growth. this study was performed consecutive two years. tillage treatments included disk harrowing + two disk harrowings as reduced tillage (15 cm plowing depth) and moldboard plowing + two disk harrowings as conventional tillage system (30 cm plowing depth). also, t...

Herbicidal activity of aryloxyphenoxypropionate and cyclohexanedione herbicides (graminicides) has been proposed to involve two mechanisms: inhibition of acetyl-coenzyme A carboxylase (ACCase) and depolarization of cell membrane potential. We examined the effect of aryloxyphenoxypropionates (diclofop and haloxyfop) and cyclohexanediones (sethoxydim and clethodim) on root cortical cell membrane ...

The antagonistic interaction between the grass herbicide, diclofopmethyl (methyl 2-[4(2',4'-dichlorophenoxy)phenoxy]propanoate) (DM), and 2,4-dichlorophenoxyacetic acid (2,4-D), was demonstrated in DM-resistant soybean (Glycine max [L.] Merr.) and DM-susceptible corn (Zea mays L.). 2,4-D caused root shortening and thickening, and induced callus growth in soybean and corn root tissue cultures at...

Ca2+ has been proposed to mediate inhibition of root elongation. However, exogenous Ca2+ at 10 or 20 millimolar, applied directly to the root cap, significantly stimulated root elongation in pea (Pisum sativum L.) and corn (Zea mays L.) seedlings. Furthermore, Ca2+ at 1 to 20 millimolar, applied unilaterally to the caps of Alaska pea roots, caused root curvature away from the Ca2+ source, whi...

In the hopes of lessening the current reliance on soil insecticides, developing a viable alternative for transgenic maize hybrids, and providing sustainable options for Europe, researchers recently have been developing novel maize lines that exhibit resistance and/or tolerance to corn rootworm larvae. Here we report the results of a 2-year field experiment in a northern growing region assessing...