Table I. Average phloem transport velocity measured on second bundle of both cotyledons after source manipulation.

Source area of each plant was reduced by shading or cutting one cotyledon. Measurements were taken 5 d after the cotyledons unfolded. Values reported are cotyledon area (mm²) and average velocity toward the roots (mm s^–1). se is in parentheses. Unique letters indicate signficantly different results (α = 0.01). For small and large cotyledon treatments, N is 4 and 5, respectively.

Measurement	Cotyledon	Shading	Cutting
Cotyl. area	Small	219 (25)A	308 (34)A
Cotyl. area	Large	610 (41)B	596 (50)B
Velocity	Small	0.05 (0.01)C	0.07 (0.01)C
Velocity	Large	0.12 (0.01)D	0.14 (0.01)D