Plant and Cell Physiology, 2001, Vol. 42, No. 9 931-941
© 2001 Oxford University Press
The Distribution of Protochlorophyllide and Chlorophyll within Seedlings of the lip1 Mutant of Pea
1 Department of Plant Physiology, Botanical Institute, Göteborg University, Box 461, SE-405 30 Göteborg, Sweden 2 Department of Biology, University of Virginia, Charlottesville, VA 22901, U.S.A.
The distribution of protochlorophyllide (Pchlide) and NADPH-Pchlide oxidoreductase (POR) was characterized in the epicotyls and roots of wild-type pea (Pisum sativum L. cv. Alaska) and lip1, a mutant with light-independent photomorphogenesis caused by a mutation in the COP1 locus. The upper part of the dark-grown lip1 mutant epicotyls had a high Pchlide content that decreased downward the organ. The elevated Pchlide level in lip1 seedlings was a result of the differentiation of more proplastids into Pchlide-containing plastids. The cortex cells in the lip1 epicotyl were filled with such plastids in contrast to the cortex cells of wild-type seedlings. The mutant also developed Pchlide-containing plastids in the roots, indicating the suppressing effect of the COP1 locus on development of plastids in the corresponding tissues in dark-grown wild-type plants. The distribution of Pchlide-containing plastids in dark-grown lip1 mutant stem and root was similar to the distribution of chloroplasts in irradiated wild-type plants. Both wild-type and lip1 epicotyls contained mostly short wavelength Pchlide fluorescing at 631 nm with only a small shoulder at 654 nm, which was transformed to a minute amount of chlorophyllide (Chlide) by flash irradiation. In contrast, with continuous irradiation a considerable amount of Chlide was formed especially in the lip1 epicotyls. Immunoblots indicated the presence of POR, as a 36 kDa band, in epicotyls of both dark-grown wild-type and lip1 mutant seedlings. However, lip1 stem tissue had a higher content of POR than the wild-type pea. The high content of POR was unexpected as lip1 lacked both the 654 nm fluorescing Pchlide form and the regular PLBs. In light, a significant amount of chlorophyll was formed also in the roots of the lip1 seedlings.
3 Corresponding author: E-mail, mahdi.seyedi@molbio.gu.se; Fax, +46-31-773-2626.
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