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Plant Physiology 62:182-184 (1978)
© 1978 American Society of Plant Biologists

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Articles

Characterization of Protoheme Levels in Etiolated and Greening Plant Tissues 1

Linda C. Stillman and Merrill L. Gassman2

Department of Biological Sciences, The University of Illinois at Chicago Circle, Box 4348, Chicago, Illinois 60680

The protoheme content of etiolated, greening, and fully greened bean (Phaseolus vulgaris L. var. Light Red Kidney) leaves has been studied. The protoheme level in etiolated and fully greened leaf tissue stays relatively constant from age 7 to 14 days. In agreement with the studies reported for barley (Castelfranco and Jones 1975 Plant Physiol 55: 485-490), the protoheme content of greening bean and barley (Hordeum vulgare var. Larker) leaves does not change appreciably during the first 9 hours of illumination, but the level rises significantly by the 24th hour of illumination (cf. Hendry and Stobart 1977 Phytochemistry 16: 1545-1548). This increase also occurs in seedlings returned to the dark for 24 to 48 hours following a 10-minute pulse of light. These results demonstrate a limited correlation with previous studies on the development of b-type cytochromes during greening of these tissues (Gregory and Bradbeer 1973; Planta 109: 317-326).

2 To whom correspondence should be addressed.

1 This work was supported by National Science Foundation Grant PCM 75-07681 A01 to M. L. G. These studies formed a part of a thesis submitted by L. C. S. to the Graduate College of the University of Illinois at Chicago Circle in partial fulfillment of the requirements for the M.S. degree.




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