Association between minor loading vein architecture and light- and CO2-saturated rates of photosynthetic oxygen evolution among Arabidopsis thaliana ecotypes from different latitudes.

The association reported here between a leaf’s light- and CO 2 -saturated rate of photosynthetic oxygen evolution and the proportion of minor loading veins devoted to phloem, and particularly the highly significant linear relationship between number, or total cross-sectional area, of these vein’s sugar-loading cells and sugar-transporting sieve elements versus their light- and CO 2 -saturated rates of photosynthetic oxygen evolution ( Figure 4 ), strongly suggests that the capacity for exporting sugars from the leaf is a contributing determinant of a leaf’s maximally achievable rate of photosynthesis.

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