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Plant and Cell Physiology, 1982, Vol. 23, No. 5 923-927
© 1982

Short communication

The Role of Phytochrome in Anthocyanin Synthesis in Seedlings of Vigna radiata (L.) Wilczek

Françoise M. Dumortier and Jan C. Vendrig

Laboratorium voor Plantenfysiologie K. U. Leuven, Vaartstraat 24, B-3000 Leuven, Belgium

Previously, it has been demonstrated that the red light-induced anthocyanin accumulation in mung bean seedlings is mediated by phytochrome [Dumortier and Vendrig Z. Pflanzenphysiol. 87: 313 (1978)]. In this paper the importance of phytochrome for the accumulation of anthocyanins in seedlings of mung beans was studied in non-irradiated seedlings and in seedlings irradiated with 5 min R.

A short FR-irradiation given early after sowing reduced the amount of anthocyanins which were normally found in non-irradiated seedlings. This indicates that PFR may be important for at least part of the anthocyanin synthesis in the dark. As for the red light-mediated anthocyanin accumulation, irradiation appeared to be most effective when given to seedlings at the age of 36–48 hr. Although the seedlings were sensitive to red light irradiation before that time, they were not able to synthesize anthocyanins until they had reached the age of 36 hr. Complete escape of red/far-red reversibility occurred only when far-red was given 12 hr after red, although partial escape could be observed with a shorter time-interval. Furthermore, the time-course of anthocyanin accumulation after a two-fold R-irradiation was compared with the effect of a single R-exposure. From the results could be concluded that the pattern of anthocyanin accumulation is dependent on the time during which PFR is present in the seedlings. These experiments also indicate that PFR not only plays a role in the synthesis of anthocyanins but probably also in their degradation.

The results of our study show that phytochrome is important for anthocyanin accumulation in non-irradiated mung bean seedlings as well as in R-irradiated, and that it probably is also involved in the degradation of the pigment.

(Received January 18, 1982; Accepted April 30, 1982)
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