Root growth inhibition

Figure 1. Linear regression plot of tomato and radish seedling root growth inhibition with varying concentrations of phenyl aliphatic acids. Benzoic acid (V) phenylacetic acid (X) 3-phenyIpiropanoic acid (A) 4-phenylbutanoic acid ( ) trans-cinnamic acid (----) (1).

Figure 2. Linear regression plot of root growth inhibition of tomato and radish seedlings by o and -hydroxyphenyl) acids. o-Hydroxycinnamic acid, (o-hydroxyphenyl) acetic acid ( ) melilotic acid, 2-(o-hydroxyphenyl) butanoic acid ( ) o-hydroxy-benzoic acid, ( -hydroxypheny 1 )acetic acid (0) -hydroxycinnamic acid, =hydroxybenzoic acid, 3-( -hydroxyphenyl) propanoic acid (X) o-coumaryl glucoside, water control (----) (1 ). ...

Figure 4. Regression analysis of radish root growth inhibition with concentration (ppm). (T) g-Hydroxybenzaldehyde, y=56.34g " x (-) prunasin, =56. (A) g-hydroxymandelonitrile,...

Both atrazine and simazine are very important herbicides in production of warm-season turfgrass sod. Many alternatives to the triazines used in established turf cannot be used in sod production due to root growth inhibition. Normal triazine use rates are 2.2kg/ha followed by 1.1 kg/ha on established turfgrasses or sod, except 4.5kg/ha followed by 2.2 kg/ha on Florida muck soils. See product labels for detailed instructions. 

HC-ToxIn. Early attempts to Isolate and characterize this toxin from a corn pathogen, Helmlnthosoorlum carbonum race 1 were performed In 1967-71 (Hfi, 1791. Nany other reports of structure determinations have been summarized (1801. Purified HC-toxIn [44], a host-specific toxin, causes substantial root growth Inhibition at ca 0.5 /tg/m1 (1811. A very similar compound, chlamydocin [45], has been Isolated from Dlheterosoora chlamvdosDora (IS2, I l). 

Inhibition of protein synthesis and root growth. Inhibition geotropic responses. Root cell disorganisation and multinucleation. 

Several in vitro tests are suitable for the determination of the growth-regulating activity of hormone-type herbicides, among them the straight growth test of wheat or oat, and the pea curvature test. Both methods yield quantitative results of good reproducibility. The Avena test elaborated by Went cannot be used in this case, but the root growth inhibition test is suitable (Audus, 1949 1951). 

Rao and Beach reported their results on the antimicrobial and root-growth inhibitory activities of a series of isoquinoline derivatives of streptonigrin (128). They confirmed the necessity of an aminoquinone function in the compound for the activity. Antibacterial activities of the isoquinoline derivatives were found to be less potent than that of streptonigrin. In contrast to the antibacterial activities, most of the isoquinoline derivatives showed activity comparable to that of streptonigrin in some cases it was higher in the root-growth inhibition assay. 

Andreae WA, Venis MA, Jursic E, Dumas T (1968) Does ethylene mediate root growth inhibition by indole-3-acetic acid Plant Physiol 43 1375-1379 Anker L (1973) The auxin production of the physiological tip of the Avena coleoptile and the repression of tip regeneration by indoleacetic acid (not by naphthylacetic acid and 2,4-dichlorophenoxyacetic acid). Acta Bot Neerl 22 221-227 Anker L (1975) Auxin-synthesis inhibition by abscisic acid, and its reversal by gibberellic acid. Acta Bot Neerl 24 339-347... 

The coronatine insensitivel coil) mutant was isolated in a screen for Arabidopsis mutants insensitive to root growth inhibition by corona-tine (Leys et al., 1994). The coil mutant is also insensitive to JAs (Feys et al., 1994), is defective... 

Soares et al. [162] found that l-DOPA increases lignification of soybean roots and that this effect correlated with root growth inhibition. It also increased the extractable levels of phenolic compounds and of phenylalanine ammonia lyase and peroxidase. No primary target site was indicated. 

Bohm, P.A.F. et al. (2006) Peroxidase activity and lignification in soybean root growth-inhibition by juglone. Biol. Plant 50, 315-317... 

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