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(fig 2a). The C flux exported from the stem was correlated with the level of stem reserve (C) analysed 10 d after anthesis (fig 3). It is also possible that the biochemical composition of WSC changes the C-flux from the stem ( (fig 4). In consequence, the strategy of NG production, based on ear fertility or on ear density, has an effect on the stem reserves. In unfavorable environments it is possible that crop yield structure based on a low number of ear/m 2 but with a high degree of fertility will be more interesting (table V). The rate of grain filling increases and the duration decreases; consequently the risk of intervention of unfavorable factors is decreased.stem reserves / translocation / yield components / genotype /Triticum = wheat

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