Water relations and composition of wheat triticum aestivum cultivar sun 9e ears grown in liquid culture effect of carbon and nitrogen

Barlow, E.W.R.; Donovan, G.R.; Lee, J.W.

Australian Journal of Plant Physiology 10(1): 99-108


ISSN/ISBN: 0310-7841
Accession: 006914105

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Detached wheat ears were grown, under lighted controlled conditions, in liquid culture media containing different concentrations of sucrose and amino acid. Higher levels of sucrose in the culture medium resulted in decreased transpiration with large accumulations of soluble sugar in the bracts. The sugar accumulations led to decreased total and osmotic potentials of the bracts, but turgor was maintained or increased. The concentration of sucrose or N in the culture medium had no significant effect on the water or osmotic potentials of the grain. Soluble sugar concentrations in the grain were not affected by increasing the sucrose concentration in the culture medium. Increasing the N level in the culture medium led to increased concentrations of total N and nonprotein N in the grain. Higher protein levels in the grain resulted in increased water content but no significant changes in the water potential of the grain. The grain was the strongest N sink within the ear and, within the grain, starch and protein syntheses were independent of each other. Proline accumulated in the bracts and to a lesser extent in the rachis in response to the accumulation of soluble sugars and N rather than to the low osmotic or total water potentials. Little proline accumulated in the grain and this was presumed to be due to translocation from other parts of the ear rather than to in situ synthesis.