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Photosynthesis and growth to maturity of antisense ribulose-1,5- bisphosphate carboxylase/oxygenase (Rubisco) activase Arabidopsis thaliana with reduced concentrations of activase relative to wild-type (Wt) plants were measured under low (200 [mu]mol m-2 s-1) and high (600 [mu]mol m-2 s-1) photosynthetic photon flux density growing conditions. Both growth and photosynthesis were significantly reduced in an Arabidopsis clone (R100) with 30 to 40% Wt activase, an effect that was more pronounced in high light. The aboveground biomass of the antisense clone R100 reached 80% of Wt under low light and 65% of Wt under high light. Decreased growth in the antisense plants was attributed to reduced relative rates of growth and leaf area expansion early in development; all plants attained similar values of relative rates of growth and leaf elongation by 21 d after planting. Reductions in photosynthesis …