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Plant and Cell Physiology, 1986, Vol. 27, No. 4 745-749
© 1986

Short Communication

Non-Autocatalytic Build-Up of Ribulose 1,5-bisphosphate during the Initial Phase of Photosynthetic Induction in Maize Leaves

Hideaki Usuda

Laboratory of Chemistry, Faculty of Medicine, Teikyo University Ohtsuka, Hachioji, Tokyo 192-03, Japan

A possible mechanism for the previous finding of a transient peak of ribulose 1,5-bisphosphate (RuBP) in maize leaves during induction of photosynthesis [Usuda (1985) Plant Physiol. 78: 859] was assessed. The transient peak in RuBP level during photosynthetic induction was eliminated when a solution of NaHCO3 was vacuum-infiltrated through vascular tissues. These results indicate that a limited supply of CO2 to RuBP carboxylase is responsible for the transient peak of RuBP. The possibility of a non-autocatalytic build-up of RuBP during the initial phase of induction is discussed.

(Received January 13, 1986; Accepted March 14, 1986)
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