SUGAR Allocation

P is crucial for several aspects of plant metabolism, especially the energy and sugar metabolism, and several enzymatic reactions, including photosynthesis. Plants have therefore developed mechanisms for the uptake and efficient use of P. Maize plants recycled N quicker from old to young tissue when P is deficient, leading to earlier leaf senescence (Usuda 1995). P-deficient plants invest more resources into root development and therefore have an increased root-to-shoot biomass ratio compared to well-nourished plants. Furthermore, they accumulate more carbohydrates in leaves and allocate more carbon to the roots (Hermans et al. 2006). 

Carbon and nutrient element allocation and redistribution, J. Plant Nutr., 22, 1315-1334, 1999. Sprague, H.B., Farris, N.F., and Colby, W.G., The effect of soil conditions and treatment on yields of tubers and sugar from the American artichoke (Helianthus tuberosus), J. Am. Soc. Ag ron., 27, 392-399, 1935. Stauffer, M.D., The potential of Jerusalem artichoke in Manitoba, in Annual Conference Manitoba Agronomics, Manitoba, Canada, 1975, pp. 62-64. 

Basis of allocation to installations 10 sectors - grandfathering method 4 sectors (cement, sugar, coke, power sector) - other methods, (projection, benchmark, historic multi criteria) ... 

Cement sector - allocation proportional to forecast production in 2005-2007 sugar sector -proportional to production in 2003 coke sector - proportional to forecast production capacities in 2005-2007 public power plants - allocation proportional to weighted values of three factors base emission (50%), electrical capacity in 2003 (25%) and maximum utilisation rate in years 1999-2002 (25%). 

RuBP carboxylase activity was measured after 5 h enrichment. Carbon allocation and partitioning was studied by introducing a pulse of C02 generated from 10 u Ci NaH CO at the beginning of enrichment. Plants were kept in pot house after 5 h of enrichment and harvested after 24 h. Samples were extracted as described elsewhere (5), Total sugar and starch content of the leaves were estimated by Somogyi s (6) method after hydrolysis according to McCready et al (7). 

Comparison of carbon allocation and partitioning of allocated carbon into starch and sugars in the source leaves showed that leaf at 5th node was a better exporter (54%) than the leaf at 2nd node (32%) of same age (Table 2). This allocation of fixed carbon to the source leaf at a particular leaf position may be influenced by the nature of the sink and the sink demand. Sinks in these two cases were functionally and metabolically distinct. 

There are but four d- and four (enantiomorphous) L-hexose phenylosazones and only two d- and two L-pentose derivatives. Thus, the preparation of the osazone of an unknown sugar may be utilized for the preliminary allocation of the unknown to a group of three possible sugars, and the final identification may be made on the basis of the preparation of difficultly soluble hydrazones which are characteristic of the individual sugars. (See above under Hydrazones.) Photomicrographs of many phenylosazones, of considerable value for identification purposes, are given by Hassid and Mc-Cready 228), The rotations of the hydrazones and osazones are utilized for distinguishing between d- and L-isomers, and for this purpose a mixture... 

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