Key points are not available for this paper at this time.
A spinach leaf piece was planed into 10 layers parallel with leaf surface. The biochemical and ultrastructural properties of the chloroplasts of these 10 layers were compared. Results showed that both the biochemical and ultrastructural properties of the chloroplasts change gradually and continuously from sun- to shade-type with the depth from the adaxial surface.
Terashima et al. (1985) studied this question.