Photosynthesis genes and their expression in Rhodobacter sphaeroides 2.4.1: a tribute to my students and associates

Kaplan, Samuel

doi:10.1007/1-4020-3324-9_89

Cited by 1 publication

(1 citation statement)

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“…However, the carbon sources that most effectively suppress the photosynthetic system also support the fastest O 2 uptake (Wettlaufer and Hardy 1992;Fleischman and Forquer 2001). Kaplan and co-workers (Kaplan 2002) have presented evidence that expression of photosynthesis genes in R. sphaeroides is suppressed by electron flow through the cbb 3 cytochrome oxidase. This sort of mechanism is appealing, since suppression of the system by reductants rather than oxidants is unusual, and the related Bradyrhizobium japonicum does possess cbb 3 , at least under microaerobic conditions (Preisig et al 1996).…”

Section: Photosystem Formation Is Substrate-dependentmentioning

confidence: 98%

Nitrogen-fixing symbiosis between photosynthetic bacteria and legumes

Giraud

Fleischman

2004

Photosynth Res

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Rhizobia having photosynthetic systems form nitrogen-fixing nodules on the stem and/or root of some species of the legumes Aeschynomene and Lotononis. This review is focused on the recent knowledge about the physiology, genetics and role of the photosystem in these bacteria. Photosynthetic electron transport seems to involve reaction centers, soluble cytochrome c2 and cytochrome bc1. Anaerobically, the electron transport system becomes over-reduced. The photosynthesis genes have been partially characterized; their organization is classical but their regulation is unusual as it is activated by far-red light via a bacteriophytochrome. This original mechanism of regulation seems well adapted to promote photosynthesis during stem symbiosis. Photosynthesis plays a major role in the efficiency of stem nodulation. It is also observed that infrared light stimulates nitrogen fixation in nodules containing photosynthetic bacteroids, suggesting that photosynthesis may additionally provides energy for nitrogen fixation, allowing for more efficient plant growth. Other aspects of these bacteria are discussed, in particular their taxonomic position and nodulation ability, the role of carotenoids and the potential for application of photosynthetic rhizobia in rice culture.

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Section: Photosystem Formation Is Substrate-dependentmentioning

confidence: 98%