Wheat inhibition

On ornamental plants CCC is appHed to a2aleas, geraniums, and hibiscus (Hibiscus sp] to make compact plants, and to poinsettias to reduce stem height and increase the red color of the bracts. A considerable amount of work has been carried out on cereals with CCC to reduce stem length and inhibit lodging. In Europe, the effect of CCC on shortening the culms of cereals is dependent upon the genotype. It has been demonstrated that the effect is as follows wheat > triticale > durum wheat > rye > oats > barley > corn = millet = rice (37). In barley, culms are initially inhibited but later the plant overcomes the inhibition (37). This has been attributed to poor assimilation, translocation, and rapid breakdown in wheat (38). 

Rothwell and Wain (126) have isolated in crystalline form a growth inhibitor from Lupinus luteus (yellow lupine) pods which they have partially characterized. Analytical data suggested that the inhibitor possessed the characteristics of an unsaturated hydroxyketo acid. Inhibition in the wheat coleoptile cylinder test was obtained with concentrations of 0.25 to 1.0 p.p.m. 

Miyamoto et al. (101) obtained four fractions from the seed coats of wheat which inhibited development of the wheat embryo. A component from one of the fractions responsible for 20% of the total inhibitor activity was crystallized but not identified. 

Addition of rice bran to the mixture of wheat bran and rice husk was the best substrates for the fungal pectinase production. The solid substrates that composed of wheat bran, rice bran and rice husk at the ratio of 6 12 2 was selected to be the best since rice bran are easily found in South-east Asian countries. Addition of either raw cassava starch or pectin as inducer is not needed. On the otherhand, pectin even inhibited the activity of the enzyme as well as that reported by Elegado and Fujio (6). 

Unlike carboxylic acids, the release and also the production of phytosidero-phores in roots of both Al-sensitive and Al-tolerant wheat cultivars was rapidly inhibited in response to Al treatments and seems to be responsible for Al-induced iron chlorosis in wheat (257). 

Y. C. Chang, J. F. Ma, and H. Matsumoto, Mechanisms of Al-induced iron chlorosis in wheat (Triticum ae.stivum). Al-inhibited biosynthesis and. secretion of phyto-siderophore. Physiol. Plant. 102 9 (1998). 

H. Bolton, L. F. Elliott, S. Gurusiddaiah, and J. K. Fredrickson, Characterisation of a toxin produced by a rhizobacterial Pseudomonas sp. that inhibits wheat growth. Plant and Soil 114 269 (1989). 

The two pseudoguaianolides confertiflorin (17) and its desacetyl derivative (18), both Isolated from A. confertlflora, show considerable differences in activity. Sorghum (87%) and ryegrass (86%) are inhibited and wheat (111%), clover (112%) and Palmer amaranth (111%) are promoted by 17. To the contrary, ryegrass (114%) is promoted by 18 while most other seeds show little effects. 

Another limitation to the studies in Table 1 is the small number of plant species tested. Primarily monocotyledonous plants have been studied, although McClure et al. (26) found ferulic acid inhibitory in soybean. The restriction of studies to monocots is probably because the mechanism of mineral absorption has been more fully elucidated with monocots. Harper and Balke (32) reported some minor differences in the inhibition of K+ absorption by salicylic acid among oats (Avena sativa L.), wheat (Triticum aestlvum L.), barley, and maize roots. 

Preparation of Krebs-2 translation extracts Krebs-2 extracts are an ideal system to screen for compounds that inhibit translation because they faithfully recapitulate the cap dependency and the cap-poly(A) synergism associated with eukaryotic mRNA translation (Svitkin and Sonenberg, 2004), unlike standard rabbit reticulocyte lysates (RRL) (Borman et al., 2000). Furthermore, the translation of many types of IRESes is supported in Krebs-2 extracts. The use of commercially available translation competent extracts prepared from RRL, wheat germ, and E. coli is extremely useful in assessing selectivity of inhibitors identified in primary screens. 

Rye Proteins. While rye is the only European cereal able to completely replace wheat in bread, rye protein is not as effective as wheat protein. One reason for this is that as much as 80% of the protein in a rye sour dough is soluble compared with 10% of soluble protein in a wheat dough. One factor that inhibits the formation of a gluten-like complex is the 4-7% of pentosans present, which bind water and raise the viscosity of the dough. The crumb structure is then formed from the pentosans in combination with the starch. 

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