Seasonal Trends of Nitrate Reductase, Carboxylating Enzymes, and Water-soluble Proteins in Two Field-grown Cultivars ofTriticum

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Abstract
Nitrate reductase, RuDP1 carboxylase, PEP carboxylase, and water-soluble proteins have been studied during the vegetative cycles of one soft and one hard wheat cultivar. Nitrate reductase was similar in amount and in pattern of variation in both varieties, the variations being related to the phenological state of the plant, because the seasonal trend was not in phase in the two varieties. The pattern of change in water-soluble proteins was significantly different in the two cultivars, namely in the consistent decline shown by the upper leaves of soft wheat. RuDP carboxylase was almost identical in amount and absolutely in phase between the two varieties, showing a dependence on seasonal factors, possibly through a photoperiodic effect. The changes in PEP carboxylase were similar in the two wheats and generally synchronous. The fluctuation in the RuDP carboxylase/PEP carboxylase ratio was due primarily to the increase in RuDP carboxvlase activity.

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