Growth inhibition Hordeum vulgare

Table IV. Age at Which B. campestris or B. oleracea var. italica Showed Allelopathic Activity (fresh material extracts, lOg/100 mL) on Radicular Growth of Hordeum vulgare, Vicia atropurpurea, Lolium multiflorum, Raphanus raphanistrum, R. sativus, B. oleracea var. italica, B. oleracea var. Georgia, and Lactuca satiya. N = 30, Numbers show percent of inhibition compared to control. 

Figure 1. Percentage of Inhibition of Radicular Growth of Hordeum vulgare and Vicia atropurpurea Produced by Extracts from Dry and Fresh Material of Different Parts of Brassica campestris. N = 30. p = 0.05%...

Increased levels of nitrogen and phosphorous reduced the Inhibition of barley (Hordeum vulgare L.) growth caused by -coumaric and vanillic acids (8a). Although other explanations are possible, these effects of fertilizers suggest that Inhibition of mineral absorption was responsible for the observed Inhibition of growth. 

Involvement of POD was also described for the degradation of indolacetic acid (IAA Salin, 1988). Increase of IAA-oxidase activity was found in Lactuca sativa seedlings (Mukherji and Das Gupta, 1972) and Hordeum vulgare roots (Coombes et al., 1976) treated with toxic amounts of copper. This response was suggested to be responsible for the growth inhibition of the seedlings and roots described. 

CDAA (N-N-diallyl-2-chloroacetamide) was reported to reduce mitosis in barley (Hordeum vulgare L.) roots nearly 90% after 96 h at 57 yM (38). Propachlor (2-chloro-N-isopropylacetanilide) totally inhibited mitosis in onion (Allium cepa L.) root tips after an 18 h treatment with 75 yM (3 ). At 20 yM cell division was reduced approximately 50% and cell enlargement was reduced 40% in oat coleoptiles (39). After 24 h, 100 yM ioxynil (4-hydroxy-3,5-diiodobenzonitrile) reduced the mitotic index in broad bean (Vicia faba L. ) and pea root tips ( ). Few herbicides that inhibit cell division have been studied in adequate detail to locate the site of the block. A notable exception is the herbicide chlorsulfuron (DPX 4189, 2-chloro-N- [(4-methoxy-6-methyl-l,3,5-triazin-2-yl)amino]carbonyl -benzenesulfonamide) ( ). Ray reported a 50% reduction in corn growth 3 h after treatment with 28 yM chlorsulfuron. Mitosis in broad bean root tips was significantly reduced by 2.8 yM, whereas in three different tests, cell enlargement was not influenced with concentrations of 28 yM. Thymidine incorporation into DNA was inhibited in corn root tips after a 1 h treatment with... 

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