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Advances in Photosynthesis Fundamental Aspects Part 2

Tham khảo tài liệu 'advances in photosynthesis fundamental aspects part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 22 Advances in Photosynthesis - Fundamental Aspects the red. Several lines of evidence show that the treatment of plants with green light can reverse cryptochrome mediated responses Banerjee et al. 2007 Bouly et al. 2007 including anthocyanin accumulation hypocotyl elongation and flowering. In this way the cry responses to blue light may be attenuated much like the red far-red responses of phytochromes. The cryptochromes are a stellar example of why examination of plant processes can have large-scale impacts. Cryptochromes were first identified in plants yet since have been shown to have central positions in the animal circadian oscillator and in magnetoperception that guides bird migration. Fungal cryptochromes have been identified yet their precise functions remain elusive for the most part and understood members bind DNA reminiscent of the cry3 CRY-DASH proteins of Arabidopsis. The cryptochrome receptors clearly control a great swath of responses relevant to all eukaryotes. 2.2.3 The phototropins 2.2.3.1 Discovery Characterization of the cryptochromes gave plant science discrete receptors for red far-red and blue light responses. A number of lines of evidence indicated that the effects of cryptochrome activation were distinct from those that regulated phototropism Liscum et al. 1992 Liscum and Briggs 1996 Lasceve et al. 1999 suggesting the existence of an additional blue light receptor class. A report in Nature showed that the cry1cry2 double mutant was deficient in first-positive phototropism Ahmad et al. 1998 . Yet the results of this work did not bear out with further tests. The pursuit for the blue-light photosensor controlling phototropism was heating up in concert with the characterization of the first cryptochrome receptor in the years leading up to 1993. Several independent research tracks were racing toward receptor identification that would ultimately converge in an Arabidopsis mutant with defects in the receptor. One approach was an attempt to .