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Plant and Cell Physiology, 1982, Vol. 23, No. 3 549-556
© 1982

Article

Mechanism of Photoregulated Carotenogenesis in Rhodotorula minuta II. Aspects of Photoregulative Reaction

Mikiro Tada and Masahide Shiroishi

Department of Agricultural Chemistry, Faculty of Agriculture, Okayama University Tsushima-naka, Okayama 700, Japan

The photoregulation of carotenogenesis in Rhodotorula minuta was found to consist of tow phases, a temperature-independent photochemical reaction (light process) and temperature-dependent but light-independent biochemical reactions (dark process). These processes were separately examined by regulating the temperature and were characterized as follows:

1) The quantity of carotenoid produced [C (µg g–1)] and the rate of carotenoid production [Vc (µg g–1 hr–1)] in the dark process were regulated by the light dose [D (erg cm–2)] to which cells were exposed in the light process. These relationships were expressed by the equations: C=9.1 log D–62.0 and Vc=0.81 log D–5.60. This photoresponse followed the Roscoe-Bunsen reciprocity law.

2) The induced state toward carotenogenesis, once acquired in the light process, was very stable, suggesting that the proposed photochemical product is stable as an inducer of carotenogenesis and decreases only in conjunction with carotenoid biosynthesis.

3) The photochemical reaction was oxygen-independent, but subsequent dark reactions were completely dependent on oxygen.

4) Postulated compounds related to the photochemical reaction were not metabolized in vivo.

(Received September 12, 1981; Accepted February 20, 1982)
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