寄生植物の光合成能喪失に伴う光受容体フィトクロムの機能変化

概要

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In angiosperms, approximately 1%, ca, 4,500 species are parasitic. Parasitic plants can be classified as to their photosynthesis status. Hemiparasites retain photosynthetic ability. On the other hand, holoparasites lack photosynthetic ability and obtain all their carbon from their hosts. In these parasitic species, selective pressure to maintain photosynthetic ability had been released. Photoresponses of plants which are important to optimize photosynthesis for green plants are not necessary in holoparasites. Photoresponses are also involved in the regulation of plant development such as germination process. Studies on photoresponses of parasitic plants revealed that the pattern of their photoresponses had been modified for adaptation to its parasitic life cycle. Molecular analysis of their red/far-red light photoreceptor phytochrome also demonstrated that the alteration of thier amino acid sequences and associated molecular function.
2010-05-31