Photosynthetic light response curves in relation to illumination of adaxial and abaxial surfaces of sun and shade leaves of <i>Vitis vinifera</i> L.

Authors

  • A. Palliotti
  • A. Cartechini

DOI:

https://doi.org/10.5073/vitis.2001.40.175-177

Keywords:

dark respiration, leaf inclination, light compensation, light saturation point, photosynthesis, photon flux density, quantum yield, shade

Abstract

The photosynthetic light response of adaxial (upper) and abaxial (lower) surfaces of sun- and shade-adapted leaves of cv. Grechetto/SO 4 was investigated. Vines were exposed to long-term shade by mounting a black polypropylene cover (40 % light transmittance) over the vines for 6 consecutive years.

The mean leaf blade inclination varied from 81.4degrees(sun-exposed) to 15.4degrees (shaded) enabling a high light reception. At light saturation, the maximum rate of photosynthesis of sun and shade leaves were similar if the adaxial or the abaxial leaf surface or both sides were irradiated simultaneously. At lower photon flux density (PFD), the adaxial surface consistently fixed more CO2 than the abaxial surface in both leaf types. At PFD below saturation, simultaneous illumination of both leaf surfaces led to an increase of the rate of net photosynthesis (Pn) as compared to illumination of only one surface with the same PFD. Bilateral illumination increased the apparent quantum yield and the convexity coefficient (bending rate of the photosynthetic light response curve) as compared to irradiation of only one side of the blade, whereas the light compensation and saturation points were significantly lower. The possible significance of simultaneous irradiation of both leaf surfaces at low PFD on Pn is discussed

 

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Published

2015-05-04

Issue

Vol. 40 No. 4 (2001): Vitis

Section

Article

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