Factors Limiting the Supply of Sucrose to the Developing Wheat Grain

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Abstract
The level of sucrose in the flag leaf blade of wheat plants growing in the field fluctuates in a conspicuous diurnal pattern, although in the endosperm the concentration of sucrose remains unaltered throughout the night and the day. The effects of defoliation on the quantity of sucrose in the grain are relatively small, and appear to depend on the length of the period between treatment and observation. In ears cultured on solutions of sucrose, the sugar accumulates to higher concentrations than normal in all parts of the ear except the grain where it remains at the concentration found in intact plants. It is concluded that the magnitude of photosynthesis is adequate to maintain at a maximum the flow of sucrose into the grain, and that the flow of sucrose is limited by the capacity of the process(es) transporting the sugar on the final stages of its passage into the grain.

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