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. 1992 Nov;100(3):1442–1447. doi: 10.1104/pp.100.3.1442

Photophysiology of the Elongated Internode (ein) Mutant of Brassica rapa1

ein Mutant Lacks a Detectable Phytochrome B-Like Polypeptide

Paul F Devlin 1,2,3, Stewart B Rood 1,2,3, David E Somers 1,2,3, Peter H Quail 1,2,3, Garry C Whitelam 1,2,3
PMCID: PMC1075804  PMID: 16653143

Abstract

Several phytochrome-controlled processes have been examined in etiolated and light-grown seedlings of a normal genotype and the elongated internode (ein/ein) mutant of rapid-cycling Brassica rapa. Although etiolated ein seedlings displayed normal sensitivity to prolonged far-red light with respect to inhibition of hypocotyl elongation, expansion of cotyledons, and synthesis of anthocyanin, they displayed reduced sensitivity to prolonged red light for all three of these deetiolation responses. In contrast to normal seedlings, light-grown ein seedlings did not show a growth promotion in response to end-of-day far-red irradiation. Additionally, whereas the first internode of light-grown normal seedlings showed a marked increase in elongation in response to reduced ratio of red to far-red light, ein seedlings showed only a small elongation response. When blots of protein extracts from etiolated and light-treated ein and normal seedlings were probed with monoclonal antibody to phytochrome A, an immunostaining band at about 120 kD was observed for both extracts. The immunostaining intensity of this band was substantially reduced for extracts of light-treated normal and ein seedlings. A mixture of three monoclonal antibodies directed against phytochrome B from Arabidopsis thaliana immunostained a band at about 120 kD for extracts of etiolated and light-treated normal seedlings. This band was undetectable in extracts of ein seedlings. We propose that ein is a photoreceptor mutant that is deficient in a light-stable phytochrome B-like species.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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