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Eight individual potatoes, exhibiting a wide range of quality characteristics, were cloned at the Texas A&amp;M Vegetable Improvement Center, College Station, Tex., in order to produce a large number of slips for field trials. Leaf photosynthetic light response for six of these clonal selections was determined during a greenhouse experiment conducted at the Texas A&amp;M Univ. Agricultural Research and Extension Center at Overton, Tex. Photosynthesis data were fit to a rectangular hyperbola in order to estimate light saturated leaf photosynthetic rate (A max ), quantum efficiency (QE), and dark respiration rate (R d ). Significant differences ( P ≥  0.05) were detected in all three of these parameter estimates among the six clonal selections. Parameter estimates ranged from 23.4 to 28.8 μmol (CO 2 ) m -2 ·s -1 , 0.056 to 0.071 mol (CO 2 )/mol (photons), and –0.9 to –2.0 μmol (CO 2 ) m -2 ·s -1  for A max , QE, and R d , respectively. However, these differences were not clearly related to quality characteristics determined for these clones in field trials.

Photosynthetic Light Response of Six Clonal Selections of the Sweet Potato Cultivar `Beauregard'