Sorghum species

These tests demonstrate that rhizomes of johnsongrass have biological activity and that the activity is residual. The allelochemic usually associated with Sorghum species in general, and with johnsongrass in particular, is the cyanogenic glucoside dhurrin (3) or its decomposition product (p-hydroxybenzaldehyde). Whether these compounds act as allelochemics in field situations is unknown and somewhat suspect, since they would surely be immobilized or altered in most soil situations, as was shown for... 

Cassava, lima beans, linseed, bamboo sprout, macadamia nuts, hydrangea, Rosaceae family (plum, peach, pear, apple, bitter almond, cherry). Sorghum species (Johnson grass, sorghum, Sudan grass, arrow grass), Linum species (flax, yellow pine flax)... 

The proanthocyanidins of Sorghum spp. and Hordeum spp. have been studied in some detail. In particular. Sorghum species have been shown to contain a polymer based largely on epicatechin-4 units with a catechin terminal unit (26, 74), but some cultivars also contain epigallocatechin-4 units (26). Certain other cultivars contain significant concentrations of a novel proluteolinidin based on 5-O-glucosylated flavan units (73). The proanthocyanidins of Hordeum spp. will be considered later. 

So, what mechanism does the producing plant use to avoid the effects seen on other species Does the plant avoid accumulation of the compound by secreting it almost as quickly as it produced, in a manner similar to that of Sorghum species that produce the allelochemical sorgo-leone only in root hairs that secrete it rapidly. Apparently this is not always the mechanism, as Berlin et al. [165] indicate that although the dry... 

Czamota, M.A. et al. (2003) Anatomy of sorgo-leone-secreting root hairs of Sorghum species. Internat. J. Plant. Sci. 164, 861-866... 

Family Gramime Genus Sorghum Species S. bicolor... 

Fig.l and Tab.l show the effects of low temperatures on the amount of polar lipids. In the leaves galactolipid content decreases in the two sorghum species, particularly MGDG. In Sorghum bicolor, phospholipid content of leaves decreases, due essentially to a decrease in PC. On the contrary, in Sorghum halepense, the amount of phospholipids shows a slight increase. 

Bagnall D. (1979)- Low temperature responses of three Sorghum species. in " Low temperature stress in crop plants the role of the membrane" (Lyons J.M. et al.eds.), pp. 67-80, Academic Press, New York... 

The effect of temperature fluctuations on net carbon dioxide uptake is ikustrated by the curves in Figure 18. As the temperature increases, net photosynthesis increases for cotton and sorghum to a maximum value and then rapidly declines. Ideally, the biomass species grown in an area should have a maximum rate of net photosynthesis as close as possible to the average temperature during the growing season in that area. 

The shift in pattern of protein synthesis during anaerobiosis has been observed in root tissue of many other plant species including rice, sorghum, barley, pea, and carrot (see Sachs Ho, 1986). In anaerobically treated barley aleurone cells, lactate dehydrogenase (LDH) activity increases (Hanson Jacobsen, 1984) as does enzyme activity and mRNA levels for ADH (Hanson, Jacobsen Zwar, 1984). 

Another approach is the utilization of allelopathic rotational crops or companion plants in annual or perennial cropping systems (19). Living rye (Secale cereale L.) and its residues have been shown to provide nearly complete suppression of a variety of agroecosystem weeds (33). Similarly, residues of sorghums, barley, wheat and oats can provide exceptional suppression of certain weed species Q ). Although some progress has been made on identifying the allelochmicals from these plants, much remains to be accomplished. 

Soaking seeds in DCM and allowing the solvent to evaporate before germination assays significantly affected germination (P <= 0.05) as shown in Table IV. Three of the monocot species, sorghum,... 

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