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SOLAR IRRADIANCE AND DROUGHT STRESS EFFECTS ON THE ACTIVITY AND CONCENTRATION OF RIBULOSE BISPHOSPHATE CARBOXYLASE IN ‘VALENCIA’ ORANGE LEAVES

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The activities of HCO3 /Mg2+-activated ribulose bisphosphate carboxylase (RuBPCase) in leaves from unstressed and drought-stressed ‘Valencia’ orange (Citrus sinensis [L.] Osbeck) trees were higher by 45% and 17%, respectively, at midmorning than at predawn and remained relatively unchanged for several hours during the day. The level of nonactivated RuBPCase in unstressed trees increased similarly at mid- morning (by 45%), but dropped back to the predawn value at midday and in the afternoon. In drought-stressed trees, however, the level of nonactivated RuBPCase decreased by 31% at midmoming. Within a 24-h diel cycle, the drought-stress- induced decreases in RuBPCase activities averaged 31% for the activated enzyme and 22% for the nonactivated one. During this 24-h experimental period, the values of RuBPCase and soluble protein in stressed leaves averaged 70% and 77%, respectively, of those recorded in control leaves. Thus, in ‘Valencia’ orange trees, a reduction in RuBPCase activity and concentration occurring under drought stress conditions would partially limit the photosynthetic capability of the leaves. Furthermore, the dark/light modulation of RuBPCase present in a variety of herbaceous plants appears to take place in this horticultural tree species as well.

Affiliations: 1: United States Department of Agriculture, Agricultural Research Service, Horticultural Research Laboratory

10.1080/0021213X.1988.10677103
/content/journals/10.1080/0021213x.1988.10677103
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/content/journals/10.1080/0021213x.1988.10677103
1988-04-12
2018-09-23

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