Plant Physiol.
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Plant Physiology 73:192-194 (1983)
© 1983 American Society of Plant Biologists

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Articles

Photosynthesis, Ribulose-1,5-bisphosphate Carboxylase, Electron Transport, and Ribulose 1,5-Bisphosphate of Virescent and Normal Green Wheat Leaves

Liliana Tomarchio, Lucio Triolo and Giorgio Dimarco1

Laboratorio Produzione Alimentare di Base, Comitato Nazionale Energia Nucleare, Centro Studi Nucleari Casaccia, C.P. 2400, Rome, Italy, Instituto Radiobiochimica ed Ecofisiologia Vegetali del Consiglio Nazionale delle Ricerche, Via Salaria Km 29,300, Monterotondo Scalo, Rome, Italy

CO2 gas exchange, ribulose-1,5-bisphosphate, and electron transport have been measured in leaves of a yellow-green mutant of wheat (Triticum durum var Cappelli) and its wild type strain grown in the field. All these parameters, expressed on leaf area basis, were similar in both genotypes except electron transport which was more than double in the wild type. These results, treated according to a recent photosynthesis model for C3 plants, seem to indicate that the electron transport rate of mutant leaves is not sufficient to support the carboxylation derived through both the assimilation rate and the in vitro ribulose-1,5-bisphosphate carboxylase activity. It is suggested that under our experimental conditions photosynthetic electron transport is not the sole energy-dependent determinant of ribulose-1,5-bisphosphate regeneration in the mutant.

1 To whom correspondence should be addressed.






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Copyright © 1983 by the American Society of Plant Biologists