Table 2.

Sucrose flux rates across the bundle sheath-companion cell interface reported in the literature.

Flux in mol sucrose m−2 s−1	Species	Transport type	Source
1.3 × 10−7	Fagus sylvatica	Symplasmic	Münch, 1930
1.6 × 10−7	Beta vulgaris	Apoplasmic	Fondy and Geiger, 1977
3.3 × 10−7	Nicotiana tabacum	Apoplasmic	Cataldo, 1974
8.2 × 10−7	Beta vulgaris	Apoplasmic	Sovonick et al., 1974
9.7 × 10−7	Cucumis melo	Symplasmic	Schmitz et al., 1987
2.3 × 10−6	Triticum aestivum	Apoplasmic	Kuo et al., 1974
2.9 × 10−6	Pisum sativum	Apoplasmic	Wimmers and Turgeon, 1991
6.9 × 10−5	Pisum sativum	Symplasmic (unloading)	Schulz, 1998