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Frontiers news briefs: July 4
Date:7/4/2013

that is, the inner layer of the bark, after cold shock as well as wounding of a leaf tip. Interestingly, the signal induced by cold shock travels rapidly with up to 3 cm per second towards the middle of the leaf to reduce assimilate transport within the phloem and the neighbouring leaf cells, and to trigger the synthesis of carbohydrates like starch and callose. In contrast, wound-induced signals have a different shape, a speed of only 0.5 cm per second, and do not inhibit assimilate translocation but reduce photosynthesis and the amount of almost all metabolites in the leaf. Fromm and colleagues conclude that different environmental factors such as cold shock and wounding incite characteristic electrical signals, each with a specific influence on photosynthesis, assimilate transport and biochemistry.

Researcher contact:

Prof. Jrg Fromm
Institute for Wood Biology
University of Hamburg, Germany
E-mail: joerg.fromm@uni-hamburg.de

URL: http://www.frontiersin.org/Plant_Physiology/10.3389/fpls.2013.00239/abstract


Frontiers in Microbiology

Nitrate ammonification by Nautilia profundicola AmH: experimental evidence consistent with a free hydroxylamine intermediate

Many microbes use nitrate in the environment for growth. Nitrate can be converted to ammonium and used in molecules such as proteins, or used as a terminal electron acceptor to make energy. A new report in Frontiers in Microbiology sheds light on how the deep-sea hydrothermal vent bacterium Nautilia profundicola strain AmH carries out these functions. Normally, genes encoding the enzymes required for nitrate reduction to ammonium are easily recognized in complete genome sequences. The genome of N. profundicola does not encode any recognizable nitrite reductases,
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Contact: Gozde Zorlu
gozde.zorlu@frontiersin.org
Frontiers
Source:Eurekalert

Page: 1 2 3 4 5 6

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