Table 3 Stomatal conductance (mmol m2 s¹) at mid and late afternoon, on abaxial and adaxial leaf surfaces with measurements along the leaf surface from the stem to the leaf tip.

From: High C3 photosynthetic capacity and high intrinsic water use efficiency underlies the high productivity of the bioenergy grass Arundo donax

Time

Leaf

Stem

Middle

Tip

Fq′/Fm

Surface

12:00

Abaxial

399 (61)

538 (72)

355 (25)

 

12:00

Adaxial

293 (30)

422 (35)

326 (64)

0.63 (0.03)

16:00

Abaxial

231 (24)

373 (77)

341 (87)

 

16:00

Adaxial

110 (10)

210 (18)

160 (28)

0.51 (0.08)

  1. (Values are means and standard errors for 4 or 5 individual plants). The operating efficiency of PSII (Fq′/Fm′) at mid and late afternoon, on the middle adaxial leaf surfaces.