title: Control of chlorophyll synthesis by phytochrome : I. The effect of phytochrome on the formation of 5-aminolevulinate in mustard seedlings.
abstract: Treatment of mustard (Sinapis alba L.) seedlings with levulinate leads to the inhibition of chlorophyll synthesis and causes the accumulation of 5-aminolevulinate which is only formed in light. A stoichiometric relationship exists between the extent of inhibition of chlorophyll synthesis and 5-aminolevulinate accumulation. The formation of 5-aminolevulinate in continuous white light is increased by pre-irradiation. The effect of the preirradiation can be fully attributed to phytochrome. Under various light conditions the rate of 5-aminolevulinate formation in levulinate-treated seedlings is similar to the rate of chlorophyll accumulation in seedlings not treated with levulinate. This result supports the hypothesis that the phytochrome-controlled chlorophyll accumulation is regulated at the level of the formation of 5-aminolevulinate.
authors.affiliation: Biological Institute II, University of Freiburg i. Br., Schänzlestraße 9-11, D-78, Freiburg i. Br., Federal Republic of Germany.
authors.forename: M
authors.initials: M
authors.lastname: Masoner
authors.forename: H
authors.initials: H
authors.lastname: Kasemir