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Daily Fluctuations of Some Metabolic Characters of Durum Wheat under Field Conditions

Physiological and biochemical parameters have been studied simultaneously with micrometeorological characters of a crop of durum wheat (Triticum durum). Micrometeorological measurements and plant analysis on flag leaves before spike appearance were done during 2 days in May 1973 to ascertain the fluctuation of chosen leaf parameters in comparison with the micrometeorological ones. The results indicate that biochemical and physiological changes occur during the day and night and that stomatal opening is the main factor dependent on climatic conditions. Specific leaf weight (SLW) seems to vary with the level of free amino acids. Ribulose diphosphate carboxylase (RuDPcase) showed daily fluctuations insensitive to climatic conditions, whereas phosphoenolpyruvate carboxylase (PEPcase) exhibited little day change.

Key Words: Triticum durum • Micrometeorology • Free amino acids • RUDP-carboxylase • PEP-carboxylase • CO₂ downward flux

Received for publication May 27, 1975.