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Phytochrome Characterization by Rabbit Antiserum against High Molecular Weight Phytochrome ¹

^a Department of Biology, Vanderbilt University, Nashville, Tennessee 37235

Both small and large sizes of phytochrome purified from Garry oat (Avena sativa L. ev. Garry) as well as large phytochrome purified from Newton oat (A. sativa L. cv. Newton), rye (Secale cereale L. cv. Balbo), barley (Hordeum vulgare L. cv. Harrison), and pea (Pisum sativum L. cv. Alaska) seedlings are characterized by a specific antiserum against large Garry oat phytochrome. A spur is observed by double diffusion assay against large and small Garry oat phytochrome indicating only partial identity. In micro-complement fixation assays, large Garry oat phytochrome yields greater activity than small Garry oat phytochrome. In addition, the peak of activity is shifted to a higher antigen concentration with small phytochrome. Phytochrome, red-absorbing form, and phytochrome, far redabsorbing form, are indistinguishable by both double diffusion and micro-complement fixation assay. The different grass phytochromes are antigenically identical by double diffusion assay. Immunoelectrophoretic analyses of oat and rye large phytochrome, after proteolysis, suggest that there are one or a few regions of the molecule especially susceptible to hydrolysis by a wide variety of endopeptidases.