Volume 48 Number 3 Article 6
Year 1994 Month 7
Title: Photosynthetic Acclimation of Leaves of Three Apple Cultivars as Affected by Growth Under Different Light Regimes
Authors: E. Fallahi, J.W. Moon Jr. and K. Jordan
Abstract:
Photosynthetic acclimation of leaves of young
'Delicious,' 'Golden Delicious,' and apple trees
(Mains domestica Bork.) as affected by growth
under full sun or 15% sun and subsequent transfer
to the contrasting light regime was studied.
Photosynthetic capacity was reduced in 'Cranny
Smith,' 'Golden Delicious' and 'Delicious' apple
leaves when grown under 15% sun.
Leaf nitrogen
per area (N) was highly correlated with CO2
assimilation (A), CO2 assimilation at saturating
CO2 (Amu), and carboxylation efficiency (g'm).
The highest N was in leaves grown under the
highest photosynthetic photon flux (PPF). Pho
tosynthetic capacity under 15$ sun was reduced
to a greater extent in 'Granny Smith' compared
to 'Golden Delicious' or 'Delicious! 'Granny
Smith' however, acclimated photosynthetically
to shade-to-sun transitions, whereas 'Delicious'
did not acclimate.
Since photosynthetic capacity
was greatly reduced by shade in 'Granny Smith'
and since "Delicious' and 'Golden Delicious' did
not acclimate to shade-to-sun transitions, the
greatest photosynthetic productivity in these
apple cultivars would be obtained by exposing
the greatest portion of the canopy to full sun
throughout the season.
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