Activin by Woodruff T.K.

By Woodruff T.K.

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1998). Thus, the pools of major end-products hold vital information on the plant’s C and N status. This information provides an estimate of metabolic resource capacity that allows the plant to adapt in response to environmental changes. The concept that sugars and amino acids participate in extensive metabolic cross talk, by modulating gene expression and thereby regulating rates of photosynthetic C and N assimilation, is central to current thinking on plant assimilate partitioning and utilization.

Novitskaya L and Foyer CH (2002b) Drought and oxidative load in wheat leaves: A predominant role for photorespiration? Ann Bot 89: 841– 850 Novitskaya L, Trevanion S, Driscoll SD, Foyer CH and Noctor G (2002) How does photorespiration modulate leaf amino acid contents? A dual approach through modelling and metabolite analysis. Plant Cell Environ 25: 821–835 Pace GH, Volk RJ and Jackson WA (1990) Nitrate reduction in response to photosynthesis. Relationship to carbohydrate supply and nitrate reductase activity in maize seedlings.

Even in older tissues the demand for C is likely to be significant. 5% (export of amino acids as Gln) or around 22% (production of protein amino acids in equal amounts—an approximation) of fixed C needs to be allocated to amino acid synthesis. These values underline the considerable respiratory fluxes that must operate in tandem with N assimilation. e. one-sixth of that linked to complete oxidation in the TCA cycle. If net production of all protein amino acids occurs at N assimilation of about 5% of net fixation, the minimum required respiratory C release would probably be around 4% of net C fixed.

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