Journal of Experimental Botany, Vol 50, 127-138, Copyright © 1999 by Oxford University Press
D Pankovic, Z Sakac, S Kevresan and M Plesnicar
The influence of long-term water deficit on photosynthesis, electron
transport and carbon metabolism of sunflower leaves has been examined.
Water deficit was imposed from flower bud formation up to the stage of full
flowering in the field on two sunflower hybrids with different drought
tolerance. CO2 assimilation and stomatal conductance of the intact leaves,
determined at atmospheric CO2 and full sunlight (1500-2000
ARTICLES
Acclimation to long-term water deficit in the leaves of two sunflower hybrids: photosynthesis, electron transport and carbon metabolism
Oil Crops Department, Institute of Field and Vegetable Crops, Novi Sad, Yugoslavia; Faculty of Agriculture, University of Novi Sad, Novi Sad, Yugoslavia; Corresponding author; Fax: +381 21 413 833; E-mail: dejanapa@ifvcns.ns.ac.yu
mol quanta m-2
s-1), decreased with water deficit. Maximum quantum
efficiency of PSII (Fy/Fm) and
relative quantum yield of PSII (
II) determined under similar
experimental conditions, did not change significantly in severely stressed
leaves. The strong inhibition of the plateau region of the light response
curve, determined at high CO2 (5%) in water-deficient sunflower leaves,
indicates that photosynthesis is also limited by non-stomatal factors. The
decreased slope and the plateau of the CO2 response curves show that the
capacity of carboxylation and RuBP regeneration decreased in severely
stressed intact leaves. Rubisco specific activity decreased in severely
stressed leaves, but Rubisco content increased under prolonged drought. The
increase of Rubisco content was significantly higher in leaves of the
drought-tolerant sunflower hybrid indicating that a higher Rubisco content
could be one factor in conferring better acclimation and higher drought
tolerance.Keywords: Helianthus
annuus, drought tolerance, gas exchange, chlorophyll
fluorescence, Rubisco
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